File Extension Lookup

Identify any file extension

Free online file extension lookup. Find out what any file extension means, its category and MIME type.

How to use File Extension Lookup

  1. Type a file extension.
  2. Click Lookup.
  3. Browse by category below.

Features

  • 70+ extensions with descriptions
  • Browse by category
  • MIME types included
  • Free online tool, no signup needed to view

Frequently asked questions

What does this tell me?

The full name, category (document, image, audio…) and MIME type for any common file extension.

Is it free?

Yes, completely free with no signup required to view the page. Login to use the tool without limits.

Is my data safe?

Yes. Everything runs locally in your browser — nothing is uploaded.

Login to use this free online tool. Create a free account to get started.