MIME Type Lookup
Look up the MIME type for a file extension, and the extensions for a MIME type.
Telling systems what a file is
A MIME type is the label that tells a browser or server what kind of file something is — text/html, image/png, application/json — and it matters because systems rely on it, not the file extension, to decide how to handle a file. This looks up the MIME type for an extension and the extensions for a type, so you can set the right one when configuring a server or debugging a download.
Enter an extension or a MIME type to see the mapping.
When the MIME type is the bug
A surprising number of web problems come down to a wrong or missing MIME type. A file served as the wrong type can be downloaded instead of displayed, a font or script can be rejected by the browser, or a download can misbehave. When something loads incorrectly for no obvious reason, the Content-Type header the server is sending is well worth checking. Knowing the correct MIME type for a file is exactly what lets you configure a server to serve it properly.
Frequently asked questions
What is a MIME type?
A label like image/png or application/json that tells a browser or server what kind of file something is, so it handles it correctly.
Why would a wrong MIME type cause a bug?
Systems trust the type over the extension, so a wrong one can make a file download instead of display, or be rejected outright.
Is anything uploaded?
No. It is a reference that runs in your browser.