MIME type lookup
Look up the MIME type for a file extension, or the extensions for a MIME type.
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About the mime type lookup
Searches the IANA media type registry in both directions: give it an extension and get the type, or give it a type fragment and get everything matching along with the extensions each one covers.
Frequently asked questions
Why does the wrong Content-Type break my page?
Browsers enforce strict MIME checking for scripts and stylesheets. A JavaScript file served as text/plain is refused outright, which usually shows up as a blocked module in the console.
What should I use for an unknown binary file?
application/octet-stream. It signals "arbitrary bytes" and prompts a download rather than an attempt to render, which is the safe default for user-supplied files.