diff --git a/package.json b/package.json
index b9865d6..d675f28 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.37.4",
+  "version": "1.38.0",
   "description": "A web-based weekly task management application that organizes to-dos and calendar events in a single, intuitive weekly view",
   "main": "index.js",
   "scripts": {
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index c55ef5b..b33894f 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -100,6 +100,7 @@ model User {
   weekdayFormat            String?               @default("long")
   weekdayCase              String?               @default("capitalize")
   customWeekdayNames       String?               @default("")
+  mobileFontScale          Float                 @default(1.0)
   startDayOffset           Int                   @default(-1)
   quoteSourceUrls          String[]              @default([])
   quoteLanguages           String[]              @default(["en", "de"])
diff --git a/src/app/api/user/profile/route.ts b/src/app/api/user/profile/route.ts
index 2c9b6dd..2742659 100644
--- a/src/app/api/user/profile/route.ts
+++ b/src/app/api/user/profile/route.ts
@@ -96,6 +96,7 @@ export async function GET(request: NextRequest) {
             lightTheme: true,
             darkTheme: true,
             notificationsEnabled: true,
+            mobileFontScale: true,
             createdAt: true
         }
     });
@@ -138,7 +139,7 @@ export async function PATCH(request: NextRequest) {
             yearFontFamily, yearFontSize, yearFontWeight, yearColor,
             showTaskCheckboxes, dayHeaderGap,
             showCompletedTasks, showLines, startDayOffset, weekdayFormat, weekdayCase, customWeekdayNames, quoteSourceUrls, quoteLanguages,
-            kanbanStages, lightTheme, darkTheme, notificationsEnabled
+            kanbanStages, lightTheme, darkTheme, notificationsEnabled, mobileFontScale
         } = body;
 
         const updateData: any = {
@@ -223,6 +224,7 @@ export async function PATCH(request: NextRequest) {
             ...(lightTheme !== undefined && { lightTheme }),
             ...(darkTheme !== undefined && { darkTheme }),
             ...(notificationsEnabled !== undefined && { notificationsEnabled }),
+            ...(mobileFontScale !== undefined && { mobileFontScale: parseFloat(mobileFontScale) || 1.0 }),
         };
         if (password && password.trim() !== "") {
             updateData.passwordHash = await bcrypt.hash(password, 10);
@@ -316,6 +318,7 @@ export async function PATCH(request: NextRequest) {
                 lightTheme: true,
                 darkTheme: true,
                 notificationsEnabled: true,
+                mobileFontScale: true,
             }
         });
 
diff --git a/src/components/WeeklyView.tsx b/src/components/WeeklyView.tsx
index c9e8a9f..293c693 100644
--- a/src/components/WeeklyView.tsx
+++ b/src/components/WeeklyView.tsx
@@ -4980,10 +4980,11 @@ export default function WeeklyView() {
     );
 
     const fontSizeScale = fontSize === "S" ? 0.85 : fontSize === "L" ? 1.15 : 1;
+    const mobileScale = isMobile ? (profile.mobileFontScale || 1.0) : 1.0;
     const fontVal = (v: string | undefined) => v && v !== "__custom__" ? v : "";
     const scaleRem = (base: string) => {
         const num = parseFloat(base);
-        return `${(num * fontSizeScale).toFixed(3)}rem`;
+        return `${(num * fontSizeScale * mobileScale).toFixed(3)}rem`;
     };
     const activeTheme = (darkMode ? profile.darkTheme : profile.lightTheme) as Record<string, string> | null;
 
@@ -5548,7 +5549,7 @@ export default function WeeklyView() {
                     {/* Center: Date display (tap to jump to date) */}
                     <button className="mobile-header-date" onClick={() => setShowDatePicker(true)} style={{
                         fontFamily: profile.cwFontFamily || "Inter",
-                        fontSize: profile.cwFontSize || "0.9rem",
+                        fontSize: scaleRem(profile.cwFontSize || "0.9rem"),
                         fontWeight: Number(profile.cwFontWeight || "700"),
                         color: adjustColorForDarkMode(profile.cwColor || (darkMode ? "#e5e7eb" : "#333333"), darkMode),
                     }}>
@@ -11914,6 +11915,55 @@ function SettingsSidebar({
                         <div
                             style={{ display: "flex", flexDirection: "column", gap: "24px" }}
                         >
+                            {/* Mobile Font Scale */}
+                            <div style={{
+                                background: "var(--weekly-settings-item-bg)",
+                                padding: "12px",
+                                borderRadius: "8px",
+                            }}>
+                                <label style={{
+                                    display: "block", fontSize: "0.85rem", fontWeight: 600,
+                                    marginBottom: "8px", color: "var(--weekly-settings-label)",
+                                }}>
+                                    {(profile.language || "en") === "de" ? "Mobile Schriftgröße" : "Mobile Font Scale"}
+                                </label>
+                                <div style={{ display: "flex", gap: "6px" }}>
+                                    {[
+                                        { label: "75%", value: 0.75 },
+                                        { label: "85%", value: 0.85 },
+                                        { label: "100%", value: 1.0 },
+                                        { label: "115%", value: 1.15 },
+                                        { label: "130%", value: 1.3 },
+                                    ].map(opt => (
+                                        <button
+                                            key={opt.value}
+                                            onClick={() => {
+                                                setProfile({ ...profile, mobileFontScale: opt.value });
+                                                saveSetting("mobileFontScale", opt.value);
+                                            }}
+                                            style={{
+                                                flex: 1, padding: "6px 4px", borderRadius: "6px",
+                                                border: (profile.mobileFontScale || 1.0) === opt.value
+                                                    ? "2px solid var(--weekly-teal, #0ea5e9)"
+                                                    : "1px solid var(--weekly-border, #ddd)",
+                                                background: (profile.mobileFontScale || 1.0) === opt.value
+                                                    ? "var(--weekly-teal, #0ea5e9)" : "transparent",
+                                                color: (profile.mobileFontScale || 1.0) === opt.value
+                                                    ? "white" : "var(--weekly-text)",
+                                                fontSize: "0.8rem", fontWeight: 600, cursor: "pointer",
+                                            }}
+                                        >
+                                            {opt.label}
+                                        </button>
+                                    ))}
+                                </div>
+                                <span style={{ fontSize: "0.7rem", color: "var(--weekly-text-light)", marginTop: "4px", display: "block" }}>
+                                    {(profile.language || "en") === "de"
+                                        ? "Skaliert alle Schriften auf Mobilgeräten (< 768px)"
+                                        : "Scales all fonts on mobile devices (< 768px)"}
+                                </span>
+                            </div>
+
                             {/* Typography Settings */}
                             <div
                                 style={{