diff --git a/src/main/resources/static/js/downloader.js b/src/main/resources/static/js/downloader.js
index 900e2539a..d70198089 100644
--- a/src/main/resources/static/js/downloader.js
+++ b/src/main/resources/static/js/downloader.js
@@ -43,6 +43,14 @@
       firstErrorOccurred = false;
       const url = this.action;
       let files = $('#fileInput-input')[0].files;
+      const uploadLimit = window.stirlingPDF?.uploadLimit ?? 0;
+      if (uploadLimit > 0) {
+        const oversizedFile = Array.from(files).find(f => f.size > uploadLimit);
+        if (oversizedFile) {
+          alert(`"${oversizedFile.name}" is too large. Maximum allowed size is ${window.stirlingPDF.uploadLimitReadable}.`);
+          return;
+        }
+      }
       const formData = new FormData(this);
       const submitButton = document.getElementById('submitBtn');
       const showGameBtn = document.getElementById('show-game-btn');
diff --git a/src/main/resources/static/js/fileInput.js b/src/main/resources/static/js/fileInput.js
index 28331ef01..d315f01cf 100644
--- a/src/main/resources/static/js/fileInput.js
+++ b/src/main/resources/static/js/fileInput.js
@@ -179,6 +179,18 @@ function setupFileInput(chooser) {
 
     await checkZipFile();
 
+    const uploadLimit = window.stirlingPDF?.uploadLimit ?? 0;
+    if (uploadLimit > 0) {
+      const oversizedFile = allFiles.find(f => f.size > uploadLimit);
+      if (oversizedFile) {
+        alert(`"${oversizedFile.name}" is too large. Maximum allowed size is ${window.stirlingPDF.uploadLimitReadable}.`);
+        allFiles = [];
+        input.value = '';
+        inputContainer.querySelector('#fileInputText').innerHTML = originalText;
+        return;
+      }
+    }
+
     allFiles = await Promise.all(
       allFiles.map(async (file) => {
         let decryptedFile = file;