diff --git a/backend/app.js b/backend/app.js
index 291d596..bb2d984 100644
--- a/backend/app.js
+++ b/backend/app.js
@@ -104,7 +104,7 @@ app.use((req, res, next) => {
         return next();
     }
 
-    express.json({ limit: '10mb' })(req, res, next);
+    express.json({ limit: `${config.fileUploadLimitMB}mb` })(req, res, next);
 });
 
 app.use((req, res, next) => {
@@ -116,7 +116,10 @@ app.use((req, res, next) => {
         return next();
     }
 
-    express.urlencoded({ extended: true, limit: '10mb' })(req, res, next);
+    express.urlencoded({
+        extended: true,
+        limit: `${config.fileUploadLimitMB}mb`,
+    })(req, res, next);
 });
 
 // CalDAV routes (registered after conditional body parsers)
diff --git a/backend/config/config.js b/backend/config/config.js
index 54e5695..5f662f1 100644
--- a/backend/config/config.js
+++ b/backend/config/config.js
@@ -103,6 +103,11 @@ const config = {
     uploadPath:
         process.env.TUDUDI_UPLOAD_PATH || path.join(projectRootPath, 'uploads'),
 
+    // File upload limit in MB (default 10MB)
+    fileUploadLimitMB: process.env.FILE_UPLOAD_LIMIT_MB
+        ? parseInt(process.env.FILE_UPLOAD_LIMIT_MB, 10)
+        : 10,
+
     // API Documentation (Swagger)
     swagger: {
         enabled: process.env.SWAGGER_ENABLED !== 'false',
diff --git a/backend/modules/auth/controller.js b/backend/modules/auth/controller.js
index 5644f91..7ac0093 100644
--- a/backend/modules/auth/controller.js
+++ b/backend/modules/auth/controller.js
@@ -4,12 +4,20 @@ const authService = require('./service');
 const { logError } = require('../../services/logService');
 const { generateToken } = require('../../middleware/csrf');
 const { isPasswordAuthEnabled } = require('../../config/authConfig');
+const { getConfig } = require('../../config/config');
 
 const authController = {
     getVersion(req, res) {
         res.json(authService.getVersion());
     },
 
+    getPublicConfig(req, res) {
+        const config = getConfig();
+        res.json({
+            fileUploadLimitMB: config.fileUploadLimitMB,
+        });
+    },
+
     async getRegistrationStatus(req, res, next) {
         try {
             const result = await authService.getRegistrationStatus();
diff --git a/backend/modules/auth/routes.js b/backend/modules/auth/routes.js
index 11c86c1..672da41 100644
--- a/backend/modules/auth/routes.js
+++ b/backend/modules/auth/routes.js
@@ -7,6 +7,7 @@ const { authLimiter, apiLimiter } = require('../../middleware/rateLimiter');
 const { csrfMiddleware } = require('../../middleware/csrf');
 
 router.get('/version', authController.getVersion);
+router.get('/config', authController.getPublicConfig);
 router.get('/registration-status', authController.getRegistrationStatus);
 router.get(
     '/password-auth-status',
diff --git a/backend/modules/projects/routes.js b/backend/modules/projects/routes.js
index 792ca8a..ffb8f26 100644
--- a/backend/modules/projects/routes.js
+++ b/backend/modules/projects/routes.js
@@ -29,7 +29,7 @@ const storage = multer.diskStorage({
 const upload = multer({
     storage: storage,
     limits: {
-        fileSize: 10 * 1024 * 1024, // 10MB limit
+        fileSize: config.fileUploadLimitMB * 1024 * 1024,
     },
     fileFilter: function (req, file, cb) {
         const allowedTypes = /jpeg|jpg|png|gif|webp/;
diff --git a/backend/modules/tasks/attachments.js b/backend/modules/tasks/attachments.js
index ddedcd1..46dce50 100644
--- a/backend/modules/tasks/attachments.js
+++ b/backend/modules/tasks/attachments.js
@@ -49,7 +49,7 @@ const storage = multer.diskStorage({
 const upload = multer({
     storage: storage,
     limits: {
-        fileSize: 10 * 1024 * 1024, // 10MB limit
+        fileSize: config.fileUploadLimitMB * 1024 * 1024,
     },
     fileFilter: function (req, file, cb) {
         if (validateFileType(file.mimetype)) {
diff --git a/docs/00-tasks-behavior.md b/docs/00-tasks-behavior.md
index e766e13..289b521 100644
--- a/docs/00-tasks-behavior.md
+++ b/docs/00-tasks-behavior.md
@@ -157,7 +157,7 @@ This document explains how tasks work in tududi from a user behavior perspective
 
 22. **Tasks can have file attachments:**
     - Multiple files can be attached to a single task
-    - File size limit: 10MB per file
+    - File size limit: 10MB per file (configurable via `FILE_UPLOAD_LIMIT_MB` environment variable)
     - Stored in `/uploads/tasks/` directory
 
 23. **Allowed file types:**
diff --git a/docs/development-workflow.md b/docs/development-workflow.md
index 0ae4f4c..1e5850f 100644
--- a/docs/development-workflow.md
+++ b/docs/development-workflow.md
@@ -115,6 +115,7 @@ FRONTEND_URL=http://localhost:8080
 BACKEND_URL=http://localhost:3002
 PORT=3002
 HOST=0.0.0.0
+FILE_UPLOAD_LIMIT_MB=10
 
 # Optional - Email
 ENABLE_EMAIL=false
diff --git a/frontend/components/Task/TaskDetails/TaskAttachmentsCard.tsx b/frontend/components/Task/TaskDetails/TaskAttachmentsCard.tsx
index 3dbc1c7..b15d44f 100644
--- a/frontend/components/Task/TaskDetails/TaskAttachmentsCard.tsx
+++ b/frontend/components/Task/TaskDetails/TaskAttachmentsCard.tsx
@@ -73,7 +73,7 @@ const TaskAttachmentsCard: React.FC<TaskAttachmentsCardProps> = ({
         if (!file) return;
 
         // Validate file
-        const validation = validateFile(file);
+        const validation = await validateFile(file);
         if (!validation.valid) {
             showErrorToast(validation.error || 'Invalid file');
             if (fileInputRef.current) {
diff --git a/frontend/components/Task/TaskForm/TaskAttachmentsSection.tsx b/frontend/components/Task/TaskForm/TaskAttachmentsSection.tsx
index 220a2a2..76d5e25 100644
--- a/frontend/components/Task/TaskForm/TaskAttachmentsSection.tsx
+++ b/frontend/components/Task/TaskForm/TaskAttachmentsSection.tsx
@@ -37,7 +37,7 @@ const TaskAttachmentsSection: React.FC<TaskAttachmentsSectionProps> = ({
         if (!file) return;
 
         // Validate file
-        const validation = validateFile(file);
+        const validation = await validateFile(file);
         if (!validation.valid) {
             showErrorToast(validation.error || 'Invalid file');
             if (fileInputRef.current) {
diff --git a/frontend/utils/attachmentsService.ts b/frontend/utils/attachmentsService.ts
index 76c9fb6..0e5f134 100644
--- a/frontend/utils/attachmentsService.ts
+++ b/frontend/utils/attachmentsService.ts
@@ -1,6 +1,7 @@
 import { Attachment, AttachmentType } from '../entities/Attachment';
 import { getApiPath } from '../config/paths';
 import { getCsrfToken } from './csrfService';
+import { getServerConfig } from './configService';
 
 /**
  * Upload a file attachment to a task
@@ -146,13 +147,15 @@ export function formatFileSize(bytes: number): string {
 /**
  * Validate file before upload
  */
-export function validateFile(file: File): { valid: boolean; error?: string } {
-    // Check file size (10MB max)
-    const maxSize = 10 * 1024 * 1024;
+export async function validateFile(
+    file: File
+): Promise<{ valid: boolean; error?: string }> {
+    const config = await getServerConfig();
+    const maxSize = config.fileUploadLimitMB * 1024 * 1024;
     if (file.size > maxSize) {
         return {
             valid: false,
-            error: 'File size exceeds 10MB limit',
+            error: `File size exceeds ${config.fileUploadLimitMB}MB limit`,
         };
     }
 
diff --git a/frontend/utils/configService.ts b/frontend/utils/configService.ts
new file mode 100644
index 0000000..d034db0
--- /dev/null
+++ b/frontend/utils/configService.ts
@@ -0,0 +1,29 @@
+import { getApiPath } from '../config/paths';
+
+interface ServerConfig {
+    fileUploadLimitMB: number;
+}
+
+let cachedConfig: ServerConfig | null = null;
+
+export async function getServerConfig(): Promise<ServerConfig> {
+    if (cachedConfig) {
+        return cachedConfig;
+    }
+
+    const response = await fetch(getApiPath('config'), {
+        method: 'GET',
+        credentials: 'include',
+    });
+
+    if (!response.ok) {
+        throw new Error('Failed to fetch server configuration');
+    }
+
+    cachedConfig = await response.json();
+    return cachedConfig;
+}
+
+export function getFileUploadLimitMB(): number {
+    return cachedConfig?.fileUploadLimitMB || 10;
+}