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MIME Type Lookup
Find the MIME type for any file extension, or the extensions for a type.
Quick Tool Overview
The MIME Type Lookup maps file extensions to content types and back, covering the formats that actually appear on the web, and writes out the complete Content-Type header with a charset where one belongs.
- What it does
- Looks up MIME types by extension, or the reverse
- You give it
- An extension or a MIME type
- You get back
- The matching type and a ready Content-Type header
- Best for
- Server configuration and file upload validation
About the MIME Type Lookup
Look up a file extension and get its MIME type, or search a MIME type and get the extensions that use it. The list covers the types that actually appear on the web: documents, images, audio, video, archives, fonts and the Office formats with their unreasonable names.
Each result comes with the Content-Type header written out, including the charset parameter where it matters. Getting this wrong has real consequences: a JavaScript file served as text/plain will not execute as a module, an SVG served as text/xml will not render in an img tag, and a font served with the wrong type is rejected outright. Types that are text are marked as such, since that decides whether the charset parameter belongs there at all.
Key features of the MIME Type Lookup
Both directions
Search an extension to find its type, or a type to find every extension that uses it.
Header written out
The complete Content-Type line, including the charset parameter for text types and correctly omitting it for binary ones.
Text or binary marked
Which decides whether a charset belongs there at all — a distinction that is easy to get wrong.
The awkward Office types
The unreasonably long openxmlformats types for docx, xlsx and pptx, in full and copyable.
Explains the consequences
Why a module served as text/plain will not execute and an SVG served as text/xml will not render.
How to use the MIME Type Lookup
-
1
Search an extension
Type png, woff2 or docx — with or without the dot.
-
2
Or search a type
Type application/json to find which extensions use it.
-
3
Copy the header
The complete Content-Type line, with a charset where one belongs.
-
4
Check whether it is text
Text types take a charset parameter; binary ones do not.
Frequently asked questions
Browsers refuse to do things. A module script served as text/plain will not execute, an SVG served as text/xml will not render in an img tag, and with nosniff set the browser will not guess on your behalf.
text/javascript. It was long considered obsolete in favour of application/javascript, but the HTML specification now names text/javascript as the correct one and browsers treat them identically.
For any text type — HTML, CSS, JavaScript, JSON, plain text. Without it the browser guesses the encoding, which is how mojibake happens. Binary types do not take it.
The universal "arbitrary bytes" type. Browsers generally offer it as a download rather than trying to display it, which is sometimes exactly what you want.
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