Developer tools
MIME Type Lookup
Look up common file extensions and MIME types locally in your browser.
Paste a dot-prefixed extension, an extension without a dot, or a MIME type. Matching happens locally in your browser.
About this MIME lookup
Does this send my input anywhere?
No. The lookup uses a small built-in list in this page and does not make a network request.
Why might a valid type be unknown?
This tool focuses on common web and file types. A vendor-specific or uncommon MIME type may not be included in its local list.
Find common file type mappings without leaving your browser.
Enter a file extension or MIME type to see its matching value from a built-in common-type list. The lookup runs locally and does not send your input to a server; uncommon or vendor-specific types may not appear in this list.
Frequently Asked Questions
Everything you need to know about this tool, how it works, and privacy.
What can I look up with this MIME type tool?
Enter a common file extension such as .json or a MIME type such as application/json. The tool returns the matching value when it is included in its built-in local list.
Does this MIME type lookup send my input anywhere?
No. The lookup runs entirely in your browser using a built-in list. CodeASystem does not upload or store the extension or MIME type you enter.
Why is a MIME type or extension unknown?
The tool intentionally covers common web and file types. A vendor-specific, uncommon, or newly registered type may not be in its local list, so confirm it with the relevant platform or server documentation.