diff --git a/src/actions/admin-ads.ts b/src/actions/admin-ads.ts
index 80869dca..a4703cc1 100644
--- a/src/actions/admin-ads.ts
+++ b/src/actions/admin-ads.ts
@@ -12,7 +12,7 @@ import { formPositiveBigInt } from "@/lib/form-data";
 
 export async function createAd(formData: FormData): Promise<void> {
   const staff = await requireStaff();
-  const image = String(formData.get("image") ?? "")
+  const image = String(formData.get("image") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!image) return;
@@ -39,10 +39,10 @@ export async function createAd(formData: FormData): Promise<void> {
 
 export async function updateAd(formData: FormData): Promise<void> {
   const staff = await requireStaff();
-  const raw = String(formData.get("id") ?? "");
+  const raw = String(formData.get("id") ?? "").normalize("NFC");
   if (!/^\d+$/.test(raw)) return;
   const id = BigInt(raw);
-  const image = String(formData.get("image") ?? "")
+  const image = String(formData.get("image") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!image) return;
diff --git a/src/actions/admin-alerts.ts b/src/actions/admin-alerts.ts
index 13a64555..24d1a90c 100644
--- a/src/actions/admin-alerts.ts
+++ b/src/actions/admin-alerts.ts
@@ -13,7 +13,7 @@ import { rcon } from "@/lib/services/rcon";
 export async function sendHotelAlert(formData: FormData): Promise<void> {
   await requireStaff();
 
-  const message = String(formData.get("message") ?? "")
+  const message = String(formData.get("message") ?? "").normalize("NFC")
     .trim()
     .slice(0, 1000);
   if (!message) return;
diff --git a/src/actions/admin-articles.ts b/src/actions/admin-articles.ts
index f3e062b8..67ec7b88 100644
--- a/src/actions/admin-articles.ts
+++ b/src/actions/admin-articles.ts
@@ -19,10 +19,10 @@ async function uniqueSlug(title: string): Promise<string> {
 
 export async function createArticle(formData: FormData): Promise<void> {
   const staff = await requireStaff();
-  const title = String(formData.get("title") ?? "").trim();
-  const shortStory = String(formData.get("shortStory") ?? "").trim();
-  const fullStory = String(formData.get("fullStory") ?? "").trim();
-  const image = String(formData.get("image") ?? "").trim();
+  const title = String(formData.get("title") ?? "").normalize("NFC").trim();
+  const shortStory = String(formData.get("shortStory") ?? "").normalize("NFC").trim();
+  const fullStory = String(formData.get("fullStory") ?? "").normalize("NFC").trim();
+  const image = String(formData.get("image") ?? "").normalize("NFC").trim();
   if (!title) return;
 
   try {
@@ -53,14 +53,14 @@ export async function updateArticle(formData: FormData): Promise<void> {
     await prisma.websiteArticles.update({
       where: { id },
       data: {
-        title: String(formData.get("title") ?? "")
+        title: String(formData.get("title") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
-        shortStory: String(formData.get("shortStory") ?? "")
+        shortStory: String(formData.get("shortStory") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
-        fullStory: String(formData.get("fullStory") ?? "").trim(),
-        image: String(formData.get("image") ?? "")
+        fullStory: String(formData.get("fullStory") ?? "").normalize("NFC").trim(),
+        image: String(formData.get("image") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
         updatedAt: new Date(),
diff --git a/src/actions/admin-badge-upload.ts b/src/actions/admin-badge-upload.ts
index 9949a92b..d6e4f223 100644
--- a/src/actions/admin-badge-upload.ts
+++ b/src/actions/admin-badge-upload.ts
@@ -27,7 +27,7 @@ export async function uploadBadge(formData: FormData): Promise<void> {
     back("error", "Badge upload directory not configured");
   }
 
-  const code = String(formData.get("code") ?? "").trim();
+  const code = String(formData.get("code") ?? "").normalize("NFC").trim();
   if (!CODE_RE.test(code)) {
     back("error", "Invalid badge code (use A-Z, 0-9, _ or -, max 64 chars)");
   }
diff --git a/src/actions/admin-badges.ts b/src/actions/admin-badges.ts
index 3740c790..a2d5adfc 100644
--- a/src/actions/admin-badges.ts
+++ b/src/actions/admin-badges.ts
@@ -9,7 +9,7 @@ export async function giveBadge(formData: FormData): Promise<void> {
   await requireStaff();
 
   const userId = Number(formData.get("userId"));
-  const code = String(formData.get("code") ?? "")
+  const code = String(formData.get("code") ?? "").normalize("NFC")
     .trim()
     .slice(0, 32);
   if (!(userId > 0) || code.length === 0) return;
diff --git a/src/actions/admin-bans.ts b/src/actions/admin-bans.ts
index 8673c023..34c0c177 100644
--- a/src/actions/admin-bans.ts
+++ b/src/actions/admin-bans.ts
@@ -15,7 +15,7 @@ export async function createBan(formData: FormData): Promise<void> {
   const staff = await requireStaff();
   const userId = Number(formData.get("userId"));
   const reason =
-    String(formData.get("reason") ?? "")
+    String(formData.get("reason") ?? "").normalize("NFC")
       .trim()
       .slice(0, 200) || "Banned";
   const hours = Number(formData.get("hours"));
diff --git a/src/actions/admin-email-templates.ts b/src/actions/admin-email-templates.ts
index 5036ab5e..9563adb0 100644
--- a/src/actions/admin-email-templates.ts
+++ b/src/actions/admin-email-templates.ts
@@ -7,14 +7,14 @@ import { formPositiveBigInt } from "@/lib/form-data";
 
 export async function createEmailTemplate(formData: FormData): Promise<void> {
   await requireStaff();
-  const name = String(formData.get("name") ?? "")
+  const name = String(formData.get("name") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const subject = String(formData.get("subject") ?? "")
+  const subject = String(formData.get("subject") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const body = String(formData.get("body") ?? "");
-  const variablesRaw = String(formData.get("variables") ?? "").trim();
+  const body = String(formData.get("body") ?? "").normalize("NFC");
+  const variablesRaw = String(formData.get("variables") ?? "").normalize("NFC").trim();
   const isActive = formData.get("isActive") != null;
   if (!name || !subject || !body) return;
 
@@ -32,7 +32,7 @@ export async function createEmailTemplate(formData: FormData): Promise<void> {
 
 export async function updateEmailTemplate(formData: FormData): Promise<void> {
   await requireStaff();
-  const raw = String(formData.get("id") ?? "");
+  const raw = String(formData.get("id") ?? "").normalize("NFC");
   if (!raw) return;
   let id: bigint;
   try {
@@ -40,11 +40,11 @@ export async function updateEmailTemplate(formData: FormData): Promise<void> {
   } catch {
     return;
   }
-  const subject = String(formData.get("subject") ?? "")
+  const subject = String(formData.get("subject") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const body = String(formData.get("body") ?? "");
-  const variablesRaw = String(formData.get("variables") ?? "").trim();
+  const body = String(formData.get("body") ?? "").normalize("NFC");
+  const variablesRaw = String(formData.get("variables") ?? "").normalize("NFC").trim();
   const isActive = formData.get("isActive") != null;
   if (!subject || !body) return;
 
diff --git a/src/actions/admin-emulator.ts b/src/actions/admin-emulator.ts
index 3c193246..af7d2525 100644
--- a/src/actions/admin-emulator.ts
+++ b/src/actions/admin-emulator.ts
@@ -11,10 +11,10 @@ import { prisma } from "@/lib/prisma";
 
 export async function updateEmulatorSetting(formData: FormData): Promise<void> {
   await requireStaff();
-  const key = String(formData.get("key") ?? "")
+  const key = String(formData.get("key") ?? "").normalize("NFC")
     .trim()
     .slice(0, 100);
-  const value = String(formData.get("value") ?? "").slice(0, 512);
+  const value = String(formData.get("value") ?? "").normalize("NFC").slice(0, 512);
   if (!key) return;
   await prisma.emulatorSettings.upsert({
     where: { key },
@@ -26,10 +26,10 @@ export async function updateEmulatorSetting(formData: FormData): Promise<void> {
 
 export async function updateEmulatorText(formData: FormData): Promise<void> {
   await requireStaff();
-  const key = String(formData.get("key") ?? "")
+  const key = String(formData.get("key") ?? "").normalize("NFC")
     .trim()
     .slice(0, 100);
-  const value = String(formData.get("value") ?? "").slice(0, 4096);
+  const value = String(formData.get("value") ?? "").normalize("NFC").slice(0, 4096);
   if (!key) return;
   await prisma.emulatorTexts.upsert({
     where: { key },
diff --git a/src/actions/admin-help.ts b/src/actions/admin-help.ts
index 0a5c72c0..96ceab28 100644
--- a/src/actions/admin-help.ts
+++ b/src/actions/admin-help.ts
@@ -17,27 +17,27 @@ function parsePosition(value: FormDataEntryValue | null): number {
 
 export async function createHelpQuestion(formData: FormData): Promise<void> {
   const staff = await requireStaff();
-  const name = String(formData.get("name") ?? "")
+  const name = String(formData.get("name") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const content = String(formData.get("content") ?? "").trim();
+  const content = String(formData.get("content") ?? "").normalize("NFC").trim();
   if (!name || !content) return;
 
-  const imageUrl = String(formData.get("imageUrl") ?? "")
+  const imageUrl = String(formData.get("imageUrl") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const buttonText = String(formData.get("buttonText") ?? "")
+  const buttonText = String(formData.get("buttonText") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const buttonUrl = String(formData.get("buttonUrl") ?? "")
+  const buttonUrl = String(formData.get("buttonUrl") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const buttonColor =
-    String(formData.get("buttonColor") ?? "")
+    String(formData.get("buttonColor") ?? "").normalize("NFC")
       .trim()
       .slice(0, 16) || "#eeb425";
   const buttonBorderColor =
-    String(formData.get("buttonBorderColor") ?? "")
+    String(formData.get("buttonBorderColor") ?? "").normalize("NFC")
       .trim()
       .slice(0, 16) || "#facc15";
 
@@ -76,27 +76,27 @@ export async function updateHelpQuestion(formData: FormData): Promise<void> {
   const id = formPositiveBigInt(formData, "id");
   if (!id) return;
 
-  const name = String(formData.get("name") ?? "")
+  const name = String(formData.get("name") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const content = String(formData.get("content") ?? "").trim();
+  const content = String(formData.get("content") ?? "").normalize("NFC").trim();
   if (!name || !content) return;
 
-  const imageUrl = String(formData.get("imageUrl") ?? "")
+  const imageUrl = String(formData.get("imageUrl") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const buttonText = String(formData.get("buttonText") ?? "")
+  const buttonText = String(formData.get("buttonText") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const buttonUrl = String(formData.get("buttonUrl") ?? "")
+  const buttonUrl = String(formData.get("buttonUrl") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const buttonColor =
-    String(formData.get("buttonColor") ?? "")
+    String(formData.get("buttonColor") ?? "").normalize("NFC")
       .trim()
       .slice(0, 16) || "#eeb425";
   const buttonBorderColor =
-    String(formData.get("buttonBorderColor") ?? "")
+    String(formData.get("buttonBorderColor") ?? "").normalize("NFC")
       .trim()
       .slice(0, 16) || "#facc15";
 
diff --git a/src/actions/admin-housekeeping.ts b/src/actions/admin-housekeeping.ts
index d0802fca..e3774daf 100644
--- a/src/actions/admin-housekeeping.ts
+++ b/src/actions/admin-housekeeping.ts
@@ -11,11 +11,11 @@ import { prisma } from "@/lib/prisma";
 export async function upsertPermission(formData: FormData): Promise<void> {
   await requireStaff();
 
-  const permission = String(formData.get("permission") ?? "")
+  const permission = String(formData.get("permission") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const minRank = Number(formData.get("minRank"));
-  const descriptionRaw = String(formData.get("description") ?? "")
+  const descriptionRaw = String(formData.get("description") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const description = descriptionRaw.length > 0 ? descriptionRaw : null;
@@ -38,7 +38,7 @@ export async function upsertPermission(formData: FormData): Promise<void> {
 export async function deletePermission(formData: FormData): Promise<void> {
   await requireStaff();
 
-  const raw = String(formData.get("id") ?? "");
+  const raw = String(formData.get("id") ?? "").normalize("NFC");
   if (!raw) return;
 
   try {
diff --git a/src/actions/admin-ip.ts b/src/actions/admin-ip.ts
index 151a2785..a8769022 100644
--- a/src/actions/admin-ip.ts
+++ b/src/actions/admin-ip.ts
@@ -5,13 +5,13 @@ import { requireStaff } from "@/lib/admin/guard";
 import { prisma } from "@/lib/prisma";
 
 function parseIp(formData: FormData): string {
-  return String(formData.get("ipAddress") ?? "")
+  return String(formData.get("ipAddress") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
 }
 
 function parseAsn(formData: FormData): string | null {
-  const asn = String(formData.get("asn") ?? "")
+  const asn = String(formData.get("asn") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   return asn || null;
@@ -30,7 +30,7 @@ export async function addWhitelist(formData: FormData): Promise<void> {
 
 export async function deleteWhitelist(formData: FormData): Promise<void> {
   await requireStaff();
-  const raw = String(formData.get("id") ?? "").trim();
+  const raw = String(formData.get("id") ?? "").normalize("NFC").trim();
   if (!raw) return;
   await prisma.websiteIpWhitelist.delete({ where: { id: BigInt(raw) } });
   revalidatePath("/admin/ip");
@@ -49,7 +49,7 @@ export async function addBlacklist(formData: FormData): Promise<void> {
 
 export async function deleteBlacklist(formData: FormData): Promise<void> {
   await requireStaff();
-  const raw = String(formData.get("id") ?? "").trim();
+  const raw = String(formData.get("id") ?? "").normalize("NFC").trim();
   if (!raw) return;
   await prisma.websiteIpBlacklist.delete({ where: { id: BigInt(raw) } });
   revalidatePath("/admin/ip");
diff --git a/src/actions/admin-maintenance.ts b/src/actions/admin-maintenance.ts
index 37b893ec..aed85517 100644
--- a/src/actions/admin-maintenance.ts
+++ b/src/actions/admin-maintenance.ts
@@ -39,11 +39,11 @@ export async function saveMaintenance(formData: FormData): Promise<void> {
   // emulator/Laravel side expects.
   const enabled = formData.get("enabled") != null ? "1" : "0";
 
-  const message = String(formData.get("message") ?? "");
+  const message = String(formData.get("message") ?? "").normalize("NFC");
 
   // Coerce the rank to a non-negative integer; fall back to AtomCMS's default
   // of 5 when the field is blank or garbage.
-  const rawRank = String(formData.get("min_rank") ?? "").trim();
+  const rawRank = String(formData.get("min_rank") ?? "").normalize("NFC").trim();
   const parsedRank = Number.parseInt(rawRank, 10);
   const minRank = Number.isFinite(parsedRank) && parsedRank >= 0 ? parsedRank : 5;
 
diff --git a/src/actions/admin-permissions.ts b/src/actions/admin-permissions.ts
index 0fcdd06d..c2bb3206 100644
--- a/src/actions/admin-permissions.ts
+++ b/src/actions/admin-permissions.ts
@@ -14,17 +14,17 @@ import { logServerError } from "@/lib/server-log";
 // created_at/updated_at are managed here.
 
 function parseMinRank(formData: FormData): number {
-  const n = Number(String(formData.get("minRank") ?? "").trim());
+  const n = Number(String(formData.get("minRank") ?? "").normalize("NFC").trim());
   return Number.isInteger(n) && n >= 0 ? n : 1;
 }
 
 export async function createPermission(formData: FormData): Promise<void> {
   const staff = await requireStaff();
-  const permission = String(formData.get("permission") ?? "")
+  const permission = String(formData.get("permission") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const minRank = parseMinRank(formData);
-  const description = String(formData.get("description") ?? "").trim() || null;
+  const description = String(formData.get("description") ?? "").normalize("NFC").trim() || null;
   if (!permission) return;
 
   const now = new Date();
@@ -51,14 +51,14 @@ export async function createPermission(formData: FormData): Promise<void> {
 
 export async function updatePermission(formData: FormData): Promise<void> {
   const staff = await requireStaff();
-  const raw = String(formData.get("id") ?? "");
+  const raw = String(formData.get("id") ?? "").normalize("NFC");
   if (!raw) return;
   const id = BigInt(raw);
-  const permission = String(formData.get("permission") ?? "")
+  const permission = String(formData.get("permission") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const minRank = parseMinRank(formData);
-  const description = String(formData.get("description") ?? "").trim() || null;
+  const description = String(formData.get("description") ?? "").normalize("NFC").trim() || null;
   if (!permission) return;
 
   try {
diff --git a/src/actions/admin-rare-values.ts b/src/actions/admin-rare-values.ts
index 5cdc0bde..d456cc13 100644
--- a/src/actions/admin-rare-values.ts
+++ b/src/actions/admin-rare-values.ts
@@ -7,10 +7,10 @@ import { formPositiveBigInt } from "@/lib/form-data";
 
 export async function createCategory(formData: FormData): Promise<void> {
   await requireStaff();
-  const name = String(formData.get("name") ?? "")
+  const name = String(formData.get("name") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const badge = String(formData.get("badge") ?? "")
+  const badge = String(formData.get("badge") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const priorityRaw = Number(formData.get("priority"));
@@ -47,10 +47,10 @@ export async function createValue(formData: FormData): Promise<void> {
   const categoryId = formPositiveBigInt(formData, "categoryId");
   if (!categoryId) return;
 
-  const name = String(formData.get("name") ?? "")
+  const name = String(formData.get("name") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const furnitureIcon = String(formData.get("furnitureIcon") ?? "")
+  const furnitureIcon = String(formData.get("furnitureIcon") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!name || !furnitureIcon) return;
@@ -58,10 +58,10 @@ export async function createValue(formData: FormData): Promise<void> {
   const itemIdRaw = Number(formData.get("itemId"));
   const itemId = Number.isFinite(itemIdRaw) && itemIdRaw > 0 ? Math.floor(itemIdRaw) : null;
 
-  const creditValueRaw = String(formData.get("creditValue") ?? "")
+  const creditValueRaw = String(formData.get("creditValue") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const currencyValueRaw = String(formData.get("currencyValue") ?? "")
+  const currencyValueRaw = String(formData.get("currencyValue") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const currencyType =
diff --git a/src/actions/admin-settings.ts b/src/actions/admin-settings.ts
index a45d90ba..55ef4dd9 100644
--- a/src/actions/admin-settings.ts
+++ b/src/actions/admin-settings.ts
@@ -7,8 +7,8 @@ import { siteSettings } from "@/lib/services/site-settings";
 
 export async function updateSetting(formData: FormData): Promise<void> {
   await requireStaff();
-  const key = String(formData.get("key") ?? "").trim();
-  const value = String(formData.get("value") ?? "");
+  const key = String(formData.get("key") ?? "").normalize("NFC").trim();
+  const value = String(formData.get("value") ?? "").normalize("NFC");
   if (!key) return;
   await prisma.websiteSetting.update({ where: { key }, data: { value } });
   siteSettings.reload();
@@ -17,11 +17,11 @@ export async function updateSetting(formData: FormData): Promise<void> {
 
 export async function createSetting(formData: FormData): Promise<void> {
   await requireStaff();
-  const key = String(formData.get("key") ?? "")
+  const key = String(formData.get("key") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const value = String(formData.get("value") ?? "");
-  const comment = String(formData.get("comment") ?? "")
+  const value = String(formData.get("value") ?? "").normalize("NFC");
+  const comment = String(formData.get("comment") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!key) return;
@@ -36,7 +36,7 @@ export async function createSetting(formData: FormData): Promise<void> {
 
 export async function deleteSetting(formData: FormData): Promise<void> {
   await requireStaff();
-  const key = String(formData.get("key") ?? "").trim();
+  const key = String(formData.get("key") ?? "").normalize("NFC").trim();
   if (!key) return;
   await prisma.websiteSetting.delete({ where: { key } });
   siteSettings.reload();
diff --git a/src/actions/admin-shop.ts b/src/actions/admin-shop.ts
index dfe1ff90..2885cf26 100644
--- a/src/actions/admin-shop.ts
+++ b/src/actions/admin-shop.ts
@@ -14,7 +14,7 @@ import { logServerError } from "@/lib/server-log";
 
 /** Parse an UnsignedInt form value, returning null when blank/invalid/negative. */
 function optUInt(formData: FormData, key: string): number | null {
-  const raw = String(formData.get(key) ?? "").trim();
+  const raw = String(formData.get(key) ?? "").normalize("NFC").trim();
   if (raw === "") return null;
   const n = Number(raw);
   if (!Number.isFinite(n) || n < 0) return null;
@@ -30,7 +30,7 @@ function reqUInt(formData: FormData, key: string): number {
 export async function createShopArticle(formData: FormData): Promise<void> {
   const staff = await requireStaff();
 
-  const name = String(formData.get("name") ?? "")
+  const name = String(formData.get("name") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!name) return;
@@ -40,13 +40,13 @@ export async function createShopArticle(formData: FormData): Promise<void> {
     const created = await prisma.websiteShopArticles.create({
       data: {
         name,
-        info: String(formData.get("info") ?? "")
+        info: String(formData.get("info") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
-        iconUrl: String(formData.get("icon") ?? "")
+        iconUrl: String(formData.get("icon") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
-        color: String(formData.get("color") ?? "")
+        color: String(formData.get("color") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
         costs: reqUInt(formData, "costs"),
@@ -55,7 +55,7 @@ export async function createShopArticle(formData: FormData): Promise<void> {
         duckets: optUInt(formData, "duckets"),
         diamonds: optUInt(formData, "diamonds"),
         badges:
-          String(formData.get("badges") ?? "")
+          String(formData.get("badges") ?? "").normalize("NFC")
             .trim()
             .slice(0, 255) || null,
         position: reqUInt(formData, "position"),
@@ -85,7 +85,7 @@ export async function updateShopArticle(formData: FormData): Promise<void> {
   const id = formPositiveBigInt(formData, "id");
   if (!id) return;
 
-  const name = String(formData.get("name") ?? "")
+  const name = String(formData.get("name") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!name) return;
@@ -95,13 +95,13 @@ export async function updateShopArticle(formData: FormData): Promise<void> {
       where: { id },
       data: {
         name,
-        info: String(formData.get("info") ?? "")
+        info: String(formData.get("info") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
-        iconUrl: String(formData.get("icon") ?? "")
+        iconUrl: String(formData.get("icon") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
-        color: String(formData.get("color") ?? "")
+        color: String(formData.get("color") ?? "").normalize("NFC")
           .trim()
           .slice(0, 255),
         costs: reqUInt(formData, "costs"),
@@ -110,7 +110,7 @@ export async function updateShopArticle(formData: FormData): Promise<void> {
         duckets: optUInt(formData, "duckets"),
         diamonds: optUInt(formData, "diamonds"),
         badges:
-          String(formData.get("badges") ?? "")
+          String(formData.get("badges") ?? "").normalize("NFC")
             .trim()
             .slice(0, 255) || null,
         position: reqUInt(formData, "position"),
diff --git a/src/actions/admin-teams.ts b/src/actions/admin-teams.ts
index d7e1be18..360a7641 100644
--- a/src/actions/admin-teams.ts
+++ b/src/actions/admin-teams.ts
@@ -7,12 +7,12 @@ import { prisma } from "@/lib/prisma";
 export async function createTeam(formData: FormData): Promise<void> {
   await requireStaff();
 
-  const rankName = String(formData.get("rankName") ?? "").trim();
+  const rankName = String(formData.get("rankName") ?? "").normalize("NFC").trim();
   if (!rankName) return;
 
-  const badge = String(formData.get("badge") ?? "").trim();
-  const jobDescription = String(formData.get("jobDescription") ?? "").trim();
-  const staffColor = String(formData.get("staffColor") ?? "").trim() || "#327fa8";
+  const badge = String(formData.get("badge") ?? "").normalize("NFC").trim();
+  const jobDescription = String(formData.get("jobDescription") ?? "").normalize("NFC").trim();
+  const staffColor = String(formData.get("staffColor") ?? "").normalize("NFC").trim() || "#327fa8";
   const hiddenRank = formData.get("hiddenRank") === "on";
 
   const now = new Date();
diff --git a/src/actions/admin-theme.ts b/src/actions/admin-theme.ts
index 3997bb8a..d2b56ffe 100644
--- a/src/actions/admin-theme.ts
+++ b/src/actions/admin-theme.ts
@@ -30,24 +30,24 @@ export async function saveTheme(formData: FormData): Promise<void> {
     for (const mode of ["light", "dark"] as const) {
       for (const key of THEME_COLOR_KEYS) {
         const dbKey = settingKey(key, mode);
-        const raw = String(formData.get(dbKey) ?? "").trim();
+        const raw = String(formData.get(dbKey) ?? "").normalize("NFC").trim();
         if (raw && COLOR_RE.test(raw)) await writeSetting(dbKey, raw);
       }
     }
-    const radius = String(formData.get("border_radius") ?? "").trim();
+    const radius = String(formData.get("border_radius") ?? "").normalize("NFC").trim();
     if (/^\d{1,3}$/.test(radius)) await writeSetting("border_radius", radius);
 
     // Typography
-    const font = String(formData.get("font_family") ?? "").trim();
+    const font = String(formData.get("font_family") ?? "").normalize("NFC").trim();
     if (font in FONTS) await writeSetting("font_family", font);
     for (const key of HEADING_KEYS) {
-      const v = String(formData.get(key) ?? "").trim();
+      const v = String(formData.get(key) ?? "").normalize("NFC").trim();
       if (/^\d{1,3}$/.test(v)) await writeSetting(key, v);
     }
 
     // Raw custom CSS (staff-trusted; length-capped, ThemeVars injects it as-is).
     if (formData.has("custom_css")) {
-      const cssRaw = String(formData.get("custom_css") ?? "").slice(0, CUSTOM_CSS_MAX);
+      const cssRaw = String(formData.get("custom_css") ?? "").normalize("NFC").slice(0, CUSTOM_CSS_MAX);
       await writeSetting("custom_css", cssRaw);
     }
 
@@ -66,7 +66,7 @@ export async function saveTheme(formData: FormData): Promise<void> {
 
 export async function applyPreset(formData: FormData): Promise<void> {
   const staff = await requireStaff();
-  const name = String(formData.get("preset") ?? "");
+  const name = String(formData.get("preset") ?? "").normalize("NFC");
   // eslint-disable-next-line security/detect-object-injection -- guarded by null check below
   const preset = PRESETS[name];
   if (!preset) redirect("/admin/theme");
diff --git a/src/actions/admin-user-edit.ts b/src/actions/admin-user-edit.ts
index 465516a6..ec86eb5c 100644
--- a/src/actions/admin-user-edit.ts
+++ b/src/actions/admin-user-edit.ts
@@ -41,9 +41,9 @@ export async function updateUser(formData: FormData): Promise<void> {
   if (!existing) return;
 
   // users row — only existing, safe columns.
-  const mailRaw = String(formData.get("mail") ?? "").trim();
-  const motto = String(formData.get("motto") ?? "").slice(0, 127);
-  const look = String(formData.get("look") ?? "").slice(0, 256);
+  const mailRaw = String(formData.get("mail") ?? "").normalize("NFC").trim();
+  const motto = String(formData.get("motto") ?? "").normalize("NFC").slice(0, 127);
+  const look = String(formData.get("look") ?? "").normalize("NFC").slice(0, 256);
   const rank = toInt(formData.get("rank"), 1);
   const credits = toInt(formData.get("credits"), 0);
   const pixels = toInt(formData.get("pixels"), 0);
diff --git a/src/actions/admin-users.ts b/src/actions/admin-users.ts
index 1762dcd8..1583b0b6 100644
--- a/src/actions/admin-users.ts
+++ b/src/actions/admin-users.ts
@@ -30,7 +30,7 @@ export async function giveCurrency(formData: FormData): Promise<void> {
 export async function setMotto(formData: FormData): Promise<void> {
   await requireStaff();
   const userId = Number(formData.get("userId"));
-  const motto = String(formData.get("motto") ?? "").slice(0, 127);
+  const motto = String(formData.get("motto") ?? "").normalize("NFC").slice(0, 127);
   if (userId > 0) {
     await prisma.user.update({ where: { id: userId }, data: { motto } });
     await rcon.setMotto(userId, motto);
@@ -59,13 +59,13 @@ export async function setRank(formData: FormData): Promise<void> {
 export async function alertUser(formData: FormData): Promise<void> {
   await requireStaff();
   const userId = Number(formData.get("userId"));
-  const message = String(formData.get("message") ?? "").trim();
+  const message = String(formData.get("message") ?? "").normalize("NFC").trim();
   if (userId > 0 && message) await rcon.alertUser(userId, message);
 }
 
 export async function disconnectUser(formData: FormData): Promise<void> {
   await requireStaff();
   const userId = Number(formData.get("userId"));
-  const username = String(formData.get("username") ?? "");
+  const username = String(formData.get("username") ?? "").normalize("NFC");
   if (userId > 0) await rcon.disconnectUser(userId, username);
 }
diff --git a/src/actions/admin-vouchers.ts b/src/actions/admin-vouchers.ts
index fa818b6b..2c1ac0e7 100644
--- a/src/actions/admin-vouchers.ts
+++ b/src/actions/admin-vouchers.ts
@@ -9,7 +9,7 @@ import { logServerError } from "@/lib/server-log";
 export async function createVoucher(formData: FormData): Promise<void> {
   await requireStaff();
 
-  const code = String(formData.get("code") ?? "")
+  const code = String(formData.get("code") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   const amount = Number(formData.get("amount"));
@@ -18,7 +18,7 @@ export async function createVoucher(formData: FormData): Promise<void> {
 
   if (!code || !(amount > 0)) return;
 
-  const expiresRaw = String(formData.get("expiresAt") ?? "").trim();
+  const expiresRaw = String(formData.get("expiresAt") ?? "").normalize("NFC").trim();
   let expiresAt: Date | null = null;
   if (expiresRaw) {
     const parsed = new Date(expiresRaw);
diff --git a/src/actions/admin-vpn.ts b/src/actions/admin-vpn.ts
index 6a9db60e..2396ba95 100644
--- a/src/actions/admin-vpn.ts
+++ b/src/actions/admin-vpn.ts
@@ -27,17 +27,17 @@ export async function saveVpn(formData: FormData): Promise<void> {
   const staff = await requireStaff();
 
   // Toggle: an unchecked checkbox submits nothing, so absence === disabled.
-  const enabled = String(formData.get("vpn_block_enabled") ?? "").trim() !== "";
+  const enabled = String(formData.get("vpn_block_enabled") ?? "").normalize("NFC").trim() !== "";
 
-  const providerRaw = String(formData.get("vpn_provider") ?? "")
+  const providerRaw = String(formData.get("vpn_provider") ?? "").normalize("NFC")
     .trim()
     .toLowerCase();
   const provider = ALLOWED_PROVIDERS.has(providerRaw) ? providerRaw : "none";
 
-  const apiKey = String(formData.get("vpn_api_key") ?? "")
+  const apiKey = String(formData.get("vpn_api_key") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
-  const blockMessage = String(formData.get("vpn_block_message") ?? "")
+  const blockMessage = String(formData.get("vpn_block_message") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
 
diff --git a/src/actions/admin-wordfilter.ts b/src/actions/admin-wordfilter.ts
index a3265835..f927d895 100644
--- a/src/actions/admin-wordfilter.ts
+++ b/src/actions/admin-wordfilter.ts
@@ -7,7 +7,7 @@ import { rcon } from "@/lib/services/rcon";
 
 export async function addWord(formData: FormData): Promise<void> {
   await requireStaff();
-  const word = String(formData.get("word") ?? "")
+  const word = String(formData.get("word") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!word) return;
@@ -23,7 +23,7 @@ export async function addWord(formData: FormData): Promise<void> {
 
 export async function deleteWord(formData: FormData): Promise<void> {
   await requireStaff();
-  const raw = String(formData.get("id") ?? "");
+  const raw = String(formData.get("id") ?? "").normalize("NFC");
   if (!raw) return;
 
   try {
diff --git a/src/actions/admin-writeable-boxes.ts b/src/actions/admin-writeable-boxes.ts
index 627f3ce2..d19120e7 100644
--- a/src/actions/admin-writeable-boxes.ts
+++ b/src/actions/admin-writeable-boxes.ts
@@ -11,7 +11,7 @@ import { logStaffActivity } from "@/lib/services/staff-activity";
 
 /** Parse a non-negative Int form value, falling back to 0. */
 function reqInt(formData: FormData, key: string): number {
-  const raw = String(formData.get(key) ?? "").trim();
+  const raw = String(formData.get(key) ?? "").normalize("NFC").trim();
   if (raw === "") return 0;
   const n = Number(raw);
   if (!Number.isFinite(n) || n < 0) return 0;
@@ -20,7 +20,7 @@ function reqInt(formData: FormData, key: string): number {
 
 /** Parse the BigInt `id` form value, returning null when blank/invalid. */
 function parseId(formData: FormData): bigint | null {
-  const raw = String(formData.get("id") ?? "").trim();
+  const raw = String(formData.get("id") ?? "").normalize("NFC").trim();
   if (!raw) return null;
   try {
     return BigInt(raw);
@@ -38,7 +38,7 @@ function revalidate(): void {
 export async function createBox(formData: FormData): Promise<void> {
   const staff = await requireStaff();
 
-  const title = String(formData.get("title") ?? "")
+  const title = String(formData.get("title") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!title) return;
@@ -49,12 +49,12 @@ export async function createBox(formData: FormData): Promise<void> {
       data: {
         title,
         icon:
-          String(formData.get("icon") ?? "")
+          String(formData.get("icon") ?? "").normalize("NFC")
             .trim()
             .slice(0, 255) || null,
-        content: String(formData.get("content") ?? ""),
+        content: String(formData.get("content") ?? "").normalize("NFC"),
         position: reqInt(formData, "position"),
-        isActive: String(formData.get("isActive") ?? "") === "1",
+        isActive: String(formData.get("isActive") ?? "").normalize("NFC") === "1",
         createdAt: now,
         updatedAt: now,
       },
@@ -80,7 +80,7 @@ export async function updateBox(formData: FormData): Promise<void> {
   const id = parseId(formData);
   if (id == null) return;
 
-  const title = String(formData.get("title") ?? "")
+  const title = String(formData.get("title") ?? "").normalize("NFC")
     .trim()
     .slice(0, 255);
   if (!title) return;
@@ -91,12 +91,12 @@ export async function updateBox(formData: FormData): Promise<void> {
       data: {
         title,
         icon:
-          String(formData.get("icon") ?? "")
+          String(formData.get("icon") ?? "").normalize("NFC")
             .trim()
             .slice(0, 255) || null,
-        content: String(formData.get("content") ?? ""),
+        content: String(formData.get("content") ?? "").normalize("NFC"),
         position: reqInt(formData, "position"),
-        isActive: String(formData.get("isActive") ?? "") === "1",
+        isActive: String(formData.get("isActive") ?? "").normalize("NFC") === "1",
         updatedAt: new Date(),
       },
     });
@@ -143,7 +143,7 @@ export async function toggleBox(formData: FormData): Promise<void> {
   if (id == null) return;
 
   // `next` carries the desired state ("1" to activate, anything else to hide).
-  const next = String(formData.get("next") ?? "") === "1";
+  const next = String(formData.get("next") ?? "").normalize("NFC") === "1";
 
   try {
     await prisma.websiteWriteableBoxes.update({
diff --git a/src/actions/applications.ts b/src/actions/applications.ts
index 1c2160ed..1d6fd917 100644
--- a/src/actions/applications.ts
+++ b/src/actions/applications.ts
@@ -28,7 +28,7 @@ export async function applyStaff(formData: FormData): Promise<void> {
   const rankId = Number(formData.get("rankId"));
   if (!Number.isInteger(rankId) || rankId <= 0) return;
 
-  const content = String(formData.get("content") ?? "")
+  const content = String(formData.get("content") ?? "").normalize("NFC")
     .trim()
     .slice(0, CONTENT_MAX);
   if (content.length < CONTENT_MIN) return;
@@ -72,7 +72,7 @@ export async function applyTeam(formData: FormData): Promise<void> {
   const rankId = Number(formData.get("teamId"));
   if (!Number.isInteger(rankId) || rankId <= 0) return;
 
-  const content = String(formData.get("content") ?? "")
+  const content = String(formData.get("content") ?? "").normalize("NFC")
     .trim()
     .slice(0, CONTENT_MAX);
   if (content.length < CONTENT_MIN) return;
diff --git a/src/actions/article-comments.ts b/src/actions/article-comments.ts
index 732ea4d8..c0a647be 100644
--- a/src/actions/article-comments.ts
+++ b/src/actions/article-comments.ts
@@ -21,7 +21,7 @@ export async function postComment(formData: FormData): Promise<void> {
   const userId = Number(session.user.id);
   if (!Number.isFinite(userId)) return;
 
-  const comment = String(formData.get("comment") ?? "")
+  const comment = String(formData.get("comment") ?? "").normalize("NFC")
     .trim()
     .slice(0, COMMENT_MAX);
   if (!comment) return;
@@ -29,7 +29,7 @@ export async function postComment(formData: FormData): Promise<void> {
   // Block filtered/AI-flagged content before it touches the DB (fail-open).
   if (!(await isAllowed(comment)).ok) return;
 
-  const articleIdRaw = String(formData.get("articleId") ?? "").trim();
+  const articleIdRaw = String(formData.get("articleId") ?? "").normalize("NFC").trim();
   if (!/^\d+$/.test(articleIdRaw)) return;
 
   let articleId: bigint;
diff --git a/src/actions/article-reactions.ts b/src/actions/article-reactions.ts
index bb681816..791fffbb 100644
--- a/src/actions/article-reactions.ts
+++ b/src/actions/article-reactions.ts
@@ -31,12 +31,12 @@ export async function toggleReaction(formData: FormData): Promise<void> {
   const userId = Number(session.user.id);
   if (!Number.isFinite(userId)) return;
 
-  const reaction = String(formData.get("reaction") ?? "")
+  const reaction = String(formData.get("reaction") ?? "").normalize("NFC")
     .trim()
     .toLowerCase();
   if (!ALLOWED_REACTIONS.has(reaction)) return;
 
-  const articleIdRaw = String(formData.get("articleId") ?? "").trim();
+  const articleIdRaw = String(formData.get("articleId") ?? "").normalize("NFC").trim();
   if (!/^\d+$/.test(articleIdRaw)) return;
 
   let articleId: bigint;
diff --git a/src/actions/auth-precheck.ts b/src/actions/auth-precheck.ts
index 98699068..9027edd7 100644
--- a/src/actions/auth-precheck.ts
+++ b/src/actions/auth-precheck.ts
@@ -12,7 +12,7 @@ export type PrecheckResult = "ok" | "invalid" | "twofactor";
  * TOTP code is still required. Lets the login form do the two-step 2FA flow.
  */
 export async function precheckLogin(username: string, password: string): Promise<PrecheckResult> {
-  const u = String(username ?? "").trim();
+  const u = String(username ?? "").normalize("NFC").trim();
   const p = String(password ?? "");
   if (!u || !p) return "invalid";
 
diff --git a/src/actions/commandocentrum.ts b/src/actions/commandocentrum.ts
index 064fa159..a3656f14 100644
--- a/src/actions/commandocentrum.ts
+++ b/src/actions/commandocentrum.ts
@@ -42,7 +42,7 @@ export async function updateNavigator(): Promise<void> {
 /** Broadcast a hotel-wide alert to every connected user (rcon: hotelalert). */
 export async function hotelAlert(formData: FormData): Promise<void> {
   await requireStaff();
-  const message = String(formData.get("message") ?? "")
+  const message = String(formData.get("message") ?? "").normalize("NFC")
     .trim()
     .slice(0, 512);
   if (!message) return;
@@ -58,7 +58,7 @@ export async function hotelAlert(formData: FormData): Promise<void> {
 export async function disconnectUser(formData: FormData): Promise<void> {
   await requireStaff();
   const userId = Number(formData.get("userId"));
-  const username = String(formData.get("username") ?? "").trim();
+  const username = String(formData.get("username") ?? "").normalize("NFC").trim();
   if (!userId || !username) return;
   try {
     await rcon.disconnectUser(userId, username);
@@ -72,7 +72,7 @@ export async function disconnectUser(formData: FormData): Promise<void> {
 export async function alertUser(formData: FormData): Promise<void> {
   await requireStaff();
   const userId = Number(formData.get("userId"));
-  const message = String(formData.get("message") ?? "")
+  const message = String(formData.get("message") ?? "").normalize("NFC")
     .trim()
     .slice(0, 512);
   if (!userId || !message) return;
@@ -144,7 +144,7 @@ export async function giveDiamonds(formData: FormData): Promise<void> {
 export async function giveBadge(formData: FormData): Promise<void> {
   await requireStaff();
   const userId = Number(formData.get("userId"));
-  const badge = String(formData.get("badge") ?? "").trim();
+  const badge = String(formData.get("badge") ?? "").normalize("NFC").trim();
   if (!userId || !badge) return;
   try {
     await rcon.giveBadge(userId, badge);
@@ -158,7 +158,7 @@ export async function giveBadge(formData: FormData): Promise<void> {
 export async function setMotto(formData: FormData): Promise<void> {
   await requireStaff();
   const userId = Number(formData.get("userId"));
-  const motto = String(formData.get("motto") ?? "")
+  const motto = String(formData.get("motto") ?? "").normalize("NFC")
     .trim()
     .slice(0, 127);
   if (!userId || !motto) return;
@@ -188,7 +188,7 @@ export async function setRank(formData: FormData): Promise<void> {
 export async function executeCommand(formData: FormData): Promise<void> {
   await requireStaff();
   const userId = Number(formData.get("userId"));
-  const command = String(formData.get("command") ?? "").trim();
+  const command = String(formData.get("command") ?? "").normalize("NFC").trim();
   if (!userId || !command) return;
   try {
     await rcon.executeCommand(userId, command);
diff --git a/src/actions/draw-badge.ts b/src/actions/draw-badge.ts
index 831e6ef7..bd0b969a 100644
--- a/src/actions/draw-badge.ts
+++ b/src/actions/draw-badge.ts
@@ -50,7 +50,7 @@ export async function buyBadge(formData: FormData): Promise<void> {
 
   // The form posts the badge row id; everything else (price, code) is resolved
   // server-side from trusted data — never from the client.
-  const rawId = String(formData.get("id") ?? "").trim();
+  const rawId = String(formData.get("id") ?? "").normalize("NFC").trim();
   if (!/^\d+$/.test(rawId)) redirect("/draw-badge?error=invalid");
 
   let outcome: "bought" | "invalid" | "credits" | "fail";
diff --git a/src/actions/guestbook.ts b/src/actions/guestbook.ts
index 70412953..2526062a 100644
--- a/src/actions/guestbook.ts
+++ b/src/actions/guestbook.ts
@@ -25,7 +25,7 @@ export async function postGuestbook(formData: FormData): Promise<void> {
   const profileId = Number(formData.get("profileId"));
   if (!Number.isInteger(profileId) || profileId <= 0) return;
 
-  const message = String(formData.get("message") ?? "")
+  const message = String(formData.get("message") ?? "").normalize("NFC")
     .trim()
     .slice(0, MESSAGE_MAX);
   if (!message) return;
@@ -34,7 +34,7 @@ export async function postGuestbook(formData: FormData): Promise<void> {
   if (!(await isAllowed(message)).ok) return;
 
   // Optional: used only to revalidate the correct profile route.
-  const username = String(formData.get("username") ?? "").trim();
+  const username = String(formData.get("username") ?? "").normalize("NFC").trim();
 
   const now = new Date();
   try {
diff --git a/src/actions/help-tickets.ts b/src/actions/help-tickets.ts
index 101e644c..57c5bff2 100644
--- a/src/actions/help-tickets.ts
+++ b/src/actions/help-tickets.ts
@@ -22,10 +22,10 @@ export async function createTicket(formData: FormData): Promise<void> {
   if (!(await rateLimit(`ticket:${userId}`, 3, 60_000)).ok) return;
 
   const raw = {
-    title: String(formData.get("title") ?? "")
+    title: String(formData.get("title") ?? "").normalize("NFC")
       .trim()
       .slice(0, 255),
-    content: String(formData.get("content") ?? "")
+    content: String(formData.get("content") ?? "").normalize("NFC")
       .trim()
       .slice(0, 5000),
   };
diff --git a/src/actions/password-reset.ts b/src/actions/password-reset.ts
index 76eab732..f4ca6f8a 100644
--- a/src/actions/password-reset.ts
+++ b/src/actions/password-reset.ts
@@ -15,7 +15,7 @@ function sha256(s: string): string {
 }
 
 export async function requestReset(formData: FormData): Promise<void> {
-  const email = String(formData.get("email") ?? "")
+  const email = String(formData.get("email") ?? "").normalize("NFC")
     .trim()
     .toLowerCase();
 
@@ -49,11 +49,11 @@ export async function requestReset(formData: FormData): Promise<void> {
 }
 
 export async function resetPassword(formData: FormData): Promise<void> {
-  const email = String(formData.get("email") ?? "")
+  const email = String(formData.get("email") ?? "").normalize("NFC")
     .trim()
     .toLowerCase();
-  const token = String(formData.get("token") ?? "").trim();
-  const password = String(formData.get("password") ?? "");
+  const token = String(formData.get("token") ?? "").normalize("NFC").trim();
+  const password = String(formData.get("password") ?? "").normalize("NFC");
 
   // Throttle reset attempts per IP (5 per 15 min) to prevent token brute-force.
   if (!(await rateLimit(`resetpwd:${await clientIp()}`, 5, 15 * 60_000)).ok) {
diff --git a/src/actions/radio-apply.ts b/src/actions/radio-apply.ts
index 48e83464..6a1bcef1 100644
--- a/src/actions/radio-apply.ts
+++ b/src/actions/radio-apply.ts
@@ -11,7 +11,7 @@ const TEXT_MAX = 5000;
 const STYLE_MAX = 5000;
 
 function str(form: FormData, key: string, max: number): string {
-  return String(form.get(key) ?? "")
+  return String(form.get(key) ?? "").normalize("NFC")
     .trim()
     .slice(0, max);
 }
diff --git a/src/actions/radio-requests.ts b/src/actions/radio-requests.ts
index da61f35a..f8f138ed 100644
--- a/src/actions/radio-requests.ts
+++ b/src/actions/radio-requests.ts
@@ -12,10 +12,10 @@ export async function submitRequest(formData: FormData): Promise<void> {
   const userId = Number(session?.user?.id);
   if (!Number.isInteger(userId) || userId <= 0) return;
 
-  const songTitle = String(formData.get("songTitle") ?? "")
+  const songTitle = String(formData.get("songTitle") ?? "").normalize("NFC")
     .trim()
     .slice(0, SONG_MAX);
-  const artist = String(formData.get("artist") ?? "")
+  const artist = String(formData.get("artist") ?? "").normalize("NFC")
     .trim()
     .slice(0, ARTIST_MAX);
   if (!songTitle && !artist) return;
diff --git a/src/actions/radio-shouts.ts b/src/actions/radio-shouts.ts
index 19a6e88e..af62dfaa 100644
--- a/src/actions/radio-shouts.ts
+++ b/src/actions/radio-shouts.ts
@@ -28,7 +28,7 @@ export async function postShout(formData: FormData): Promise<void> {
   if (!(await rateLimit(`shout:${userId}`, 5, 30_000)).ok) return;
 
   const raw = {
-    message: String(formData.get("message") ?? "")
+    message: String(formData.get("message") ?? "").normalize("NFC")
       .trim()
       .slice(0, 255),
   };
diff --git a/src/actions/register.ts b/src/actions/register.ts
index d07cd21e..c9cbf718 100644
--- a/src/actions/register.ts
+++ b/src/actions/register.ts
@@ -31,12 +31,12 @@ const DEFAULT_LOOK = "hr-100-.hd-180-1.ch-255-66.lg-280-110.sh-305-62";
 
 export async function register(prevState: string | null, formData: FormData): Promise<string | null> {
   const raw = {
-    username: String(formData.get("username") ?? "").trim(),
-    mail: String(formData.get("mail") ?? "")
+    username: String(formData.get("username") ?? "").normalize("NFC").trim(),
+    mail: String(formData.get("mail") ?? "").normalize("NFC")
       .trim()
       .toLowerCase(),
-    password: String(formData.get("password") ?? ""),
-    look: String(formData.get("look") ?? "").trim() || DEFAULT_LOOK,
+    password: String(formData.get("password") ?? "").normalize("NFC"),
+    look: String(formData.get("look") ?? "").normalize("NFC").trim() || DEFAULT_LOOK,
   };
 
   const parsed = registerSchema.safeParse(raw);
@@ -56,7 +56,7 @@ export async function register(prevState: string | null, formData: FormData): Pr
   // CAPTCHA (Turnstile / reCAPTCHA) — only enforced when configured in settings.
   const cfg = await captchaConfig();
   if (cfg.provider !== "none") {
-    const token = String(formData.get(cfg.field) ?? "");
+    const token = String(formData.get(cfg.field) ?? "").normalize("NFC");
     if (!(await verifyCaptcha(token, ip))) return "Captcha verification failed. Please try again.";
   }
 
diff --git a/src/actions/social.ts b/src/actions/social.ts
index 68fc4e98..510378c0 100644
--- a/src/actions/social.ts
+++ b/src/actions/social.ts
@@ -61,7 +61,7 @@ export async function sendFriendRequest(formData: FormData): Promise<void> {
 
   // Optional: revalidate the target profile if a username was supplied, purely
   // to refresh any request-state UI rendered there.
-  const username = String(formData.get("username") ?? "").trim();
+  const username = String(formData.get("username") ?? "").normalize("NFC").trim();
   if (username) revalidatePath(`/u/${username}`);
 }
 
@@ -85,10 +85,10 @@ export async function postThread(formData: FormData): Promise<void> {
   const guildId = Number(formData.get("guildId"));
   if (!Number.isInteger(guildId) || guildId <= 0) return;
 
-  const subject = String(formData.get("subject") ?? "")
+  const subject = String(formData.get("subject") ?? "").normalize("NFC")
     .trim()
     .slice(0, SUBJECT_MAX);
-  const message = String(formData.get("message") ?? "")
+  const message = String(formData.get("message") ?? "").normalize("NFC")
     .trim()
     .slice(0, MESSAGE_MAX);
   if (!subject || !message) return;
diff --git a/src/actions/twofactor.ts b/src/actions/twofactor.ts
index 57d8adea..cd494756 100644
--- a/src/actions/twofactor.ts
+++ b/src/actions/twofactor.ts
@@ -92,7 +92,7 @@ export async function confirmTwoFactor(formData: FormData): Promise<void> {
 
   if (!(await rateLimit(`2fa-confirm:${id}`, 5, 30_000)).ok) redirect("/settings/2fa?error=ratelimit");
 
-  const code = String(formData.get("code") ?? "").trim();
+  const code = String(formData.get("code") ?? "").normalize("NFC").trim();
 
   const { ok } = await verifyTwoFactorCode(id, code);
   if (!ok) redirect("/settings/2fa?error=badcode");
@@ -107,7 +107,7 @@ export async function disableTwoFactor(formData: FormData): Promise<void> {
 
   if (!(await rateLimit(`2fa-disable:${id}`, 5, 30_000)).ok) redirect("/settings/2fa?error=ratelimit");
 
-  const code = String(formData.get("code") ?? "").trim();
+  const code = String(formData.get("code") ?? "").normalize("NFC").trim();
 
   const { ok } = await verifyTwoFactorCode(id, code);
   if (!ok) redirect("/settings/2fa?error=badcode");
diff --git a/src/actions/user-settings.ts b/src/actions/user-settings.ts
index 37693139..61ff8d63 100644
--- a/src/actions/user-settings.ts
+++ b/src/actions/user-settings.ts
@@ -34,7 +34,7 @@ const updateMottoAction = authAction(
 );
 
 export async function updateMotto(formData: FormData): Promise<void> {
-  const motto = String(formData.get("motto") ?? "").slice(0, MOTTO_MAX);
+  const motto = String(formData.get("motto") ?? "").normalize("NFC").slice(0, MOTTO_MAX);
   await updateMottoAction({ motto });
 }
 
diff --git a/src/actions/voucher.ts b/src/actions/voucher.ts
index d842f920..3af634f6 100644
--- a/src/actions/voucher.ts
+++ b/src/actions/voucher.ts
@@ -34,7 +34,7 @@ export async function redeem(_prev: RedeemState, formData: FormData): Promise<Re
     return { ok: false, message: "Your session is invalid. Please sign in again." };
   }
 
-  const code = String(formData.get("code") ?? "").trim();
+  const code = String(formData.get("code") ?? "").normalize("NFC").trim();
   if (!code) {
     return { ok: false, message: "Please enter a voucher code." };
   }