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MIME Type Lookup

Search a reference of file extensions and their media (MIME) types. Enter an extension such as .webp or a type such as application/pdf to see the match, whether it is text or binary, and whether it is safe to serve inline.

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MIME types

Your result will appear here.

Not sure where to start? Use Load example.

Results update automatically and are calculated on your device. Nothing you type is sent to a server.

Runs in your browser. Processing happens entirely in your browser. Nothing you enter is sent to Delimiter.live.

How to use the MIME Type Lookup

  1. Type a file extension, a MIME type, or a general word such as "image".
  2. Read the matching rows, including whether the format is text or binary.
  3. Use the group filter to browse a whole family of types.

Example

Input
webp
Output
.webp → image/webp (binary, safe to serve inline)

Common use cases

  • Setting the correct Content-Type header when serving a file.
  • Configuring an upload allow-list by media type rather than by extension.
  • Working out why a browser downloads a file instead of displaying it.

Limitations and things to watch for

  • The list covers common web and desktop formats rather than the complete IANA registry, which contains thousands of rarely used entries.
  • A MIME type describes what a file claims to be. Never trust a client-supplied Content-Type for security decisions — validate the file contents on the server as well.

Frequently asked questions

What is a MIME type?
A short label such as text/html or image/png that tells a client what kind of data it is receiving. On the web it is sent in the Content-Type response header and determines how the browser handles the file. The official term is now "media type".
Why does my file download instead of displaying?
Usually because the Content-Type is wrong — often the generic application/octet-stream — or because a Content-Disposition: attachment header is set.
Can I rely on MIME type for upload security?
No. The type a browser sends is supplied by the client and can be forged. Check the file contents server-side and serve user uploads from a separate origin with a strict Content-Type and nosniff header.

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