How to Change the Allowed File Types in File Upload

December 7, 2023

This guide shows how to change the allowed file types on your form when using the File Upload element.

The default allowed files extensions are as follows:

  • PDF
  • DOC
  • DOCX
  • XLS
  • XLSX
  • CSV
  • TXT
  • RTF
  • HTML
  • ZIP
  • MP3
  • WMA
  • MPG
  • FLV
  • AVI
  • JPG
  • JPEG
  • PNG
  • GIF

You can add or remove these extensions to limit your form only to accept specific file types. Here’s how:

  1. In Form Builder, add a File Upload element to your form or select an existing one.
An arrow pointing to the File Upload element in Form Builder's Form Elements pane
An arrow pointing to the File Upload element in Form Builder's Form Elements pane
  1. Select the File Upload’s gear icon to open properties.
An arrow pointing to the File Upload element's gear icon, to open properties, in Form Builder
  1. In the properties pane on the right, go to Options at the top.
  2. List your allowed file extensions comma-separated in the File Types field.
Highlights to access the File Upload element's File Types option in Form Builder


  • The allowed extensions list is case-insensitive.
  • List the extensions without a leading dot (e.g., enter “pdf” instead of “.pdf”).
  • Enter asterisk (“*”) in File Types to allow all file types.
  • Your form will show an invalid extension message when a form filler tries to upload a file that is not in the allowed list.

See also: Changing the File Upload Size Limit.

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