diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9254b1bb..67a4c0f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 4.1.0
+
+_New Features:_
+
+- Added `uploadSizeLimit` option (`OTHER_UPLOAD_SIZE_LIMIT` env) [(#580)](https://github.com/highcharts/node-export-server/pull/580).
+
 # 4.0.2
 
 _Hotfix_:
diff --git a/README.md b/README.md
index effeb48f..8838dc74 100644
--- a/README.md
+++ b/README.md
@@ -261,7 +261,8 @@ The format, along with its default values, is as follows (using the recommended
     "listenToProcessExits": true,
     "noLogo": false,
     "hardResetPage": false,
-    "browserShellMode": true
+    "browserShellMode": true,
+    "uploadSizeLimit": 52428800
   },
   "debug": {
     "enable": false,
@@ -371,6 +372,7 @@ These variables are set in your environment and take precedence over options fro
 - `OTHER_NO_LOGO`: Skip printing the logo on a startup. Will be replaced by a simple text (defaults to `false`).
 - `OTHER_HARD_RESET_PAGE`: Determines whether the page's content should be reset from scratch, including Highcharts scripts (defaults to `false`).
 - `OTHER_BROWSER_SHELL_MODE`: Decides whether to enable older but much more performant _shell_ mode for the browser (defaults to `true`).
+- `OTHER_UPLOAD_SIZE_LIMIT`: Determines the maximum size of the uploaded file in bytes. The default is 50MB (52428800 bytes).
 
 ### Debugging Config
 - `DEBUG_ENABLE`: Enables or disables debug mode for the underlying browser (defaults to `false`).
diff --git a/lib/envs.js b/lib/envs.js
index 885d7f07..3f63d14c 100644
--- a/lib/envs.js
+++ b/lib/envs.js
@@ -207,6 +207,7 @@ export const Config = z.object({
   OTHER_NO_LOGO: v.boolean(),
   OTHER_HARD_RESET_PAGE: v.boolean(),
   OTHER_BROWSER_SHELL_MODE: v.boolean(),
+  OTHER_UPLOAD_SIZE_LIMIT: v.positiveNum(),
 
   // debugger
   DEBUG_ENABLE: v.boolean(),
diff --git a/lib/schemas/config.js b/lib/schemas/config.js
index 50600dfd..aa2d03b7 100644
--- a/lib/schemas/config.js
+++ b/lib/schemas/config.js
@@ -643,6 +643,13 @@ export const defaultConfig = {
       type: 'boolean',
       envLink: 'OTHER_BROWSER_SHELL_MODE',
       description: 'Decides if the browser runs in the shell mode.'
+    },
+    uploadSizeLimit: {
+      value: 50 * 1024 * 1024,
+      type: 'number',
+      envLink: 'OTHER_UPLOAD_SIZE_LIMIT',
+      description:
+        'The maximum size of the uploaded file in bytes. The default is 50 MB (50 * 1024 * 1024 bytes).'
     }
   },
   debug: {
diff --git a/lib/server/server.js b/lib/server/server.js
index 45c03b86..3dbdc540 100644
--- a/lib/server/server.js
+++ b/lib/server/server.js
@@ -25,6 +25,7 @@ import errorHandler from './error.js';
 import rateLimit from './rate_limit.js';
 import { log, logWithStack } from '../logger.js';
 import { __dirname } from '../utils.js';
+import { getOptions } from '../config.js';
 
 import vSwitchRoute from './routes/change_hc_version.js';
 import exportRoutes from './routes/export.js';
@@ -45,22 +46,6 @@ app.disable('x-powered-by');
 // Enable CORS support
 app.use(cors());
 
-// Enable parsing of form data (files) with Multer package
-const storage = multer.memoryStorage();
-const upload = multer({
-  storage,
-  limits: {
-    fieldSize: 50 * 1024 * 1024
-  }
-});
-
-// Enable body parser
-app.use(express.json({ limit: 50 * 1024 * 1024 }));
-app.use(express.urlencoded({ extended: true, limit: 50 * 1024 * 1024 }));
-
-// Use only non-file multipart form fields
-app.use(upload.none());
-
 /**
  * Attach error handlers to the server.
  *
@@ -93,6 +78,25 @@ const attachServerErrorHandlers = (server) => {
  * and started.
  */
 export const startServer = async (serverConfig) => {
+  const uploadSizeLimit =
+    getOptions()?.other?.uploadSizeLimit || 50 * 1024 * 1024;
+
+  // Enable parsing of form data (files) with Multer package
+  const storage = multer.memoryStorage();
+  const upload = multer({
+    storage,
+    limits: {
+      fieldSize: uploadSizeLimit
+    }
+  });
+
+  // Enable body parser
+  app.use(express.json({ limit: uploadSizeLimit }));
+  app.use(express.urlencoded({ extended: true, limit: uploadSizeLimit }));
+
+  // Use only non-file multipart form fields
+  app.use(upload.none());
+
   try {
     // Stop if not enabled
     if (!serverConfig.enable) {