MIME Type Lookup (File Extension ↔ Content-Type)
Look up the MIME type of a file extension or the extensions of a MIME type: 1,000+ IANA and common types with a ready Content-Type header and charset.
Data: IANA Media Types registry as compiled in the mime-db project (v1.54.0), plus application/yaml (RFC 9512) and text/event-stream.
| MIME type | Extensions | Listed by | Compressible | Charset |
|---|---|---|---|---|
| image/webp | .webp | IANA | — | — |
A web server or API has to say what kind of file it sends with a Content-Type header, and uploads are often checked against a list of allowed MIME types. Type a file extension or a file name to get its MIME type, or a MIME type to get its usual extensions. Each answer includes a ready-to-paste Content-Type header with the right charset, whether the format is worth gzip or brotli compression, and whether the type is registered with IANA or just common practice.
How to use this tool
- Type an extension (webp), a file name (report.docx) or a MIME type (application/json).
- Read the MIME type, the other types sometimes used for the same extension, and the Content-Type header.
- Choose "Every type in the same family" to browse all image/, audio/ or font/ types.
- Or type a word such as font or zip to search inside MIME type names.
Formula
type "/" subtype [ "+" suffix ] [ "; charset=" value ]
The top-level type is one of application, audio, font, image, message, model, multipart, text or video. vnd. marks vendor types, x- unregistered ones, and +json, +xml or +zip the underlying format. When several types claim an extension, the registered IANA type wins, then the one without x-, then a media type over application/.
Example
webp gives image/webp with the header Content-Type: image/webp and "no — already compressed", so a server should not gzip it. .json gives application/json with charset=utf-8; app.js gives text/javascript, which RFC 9239 made the standard type for JavaScript, with the older application/javascript listed as also used.
Frequently asked questions
Which MIME type should I use for JavaScript?
text/javascript. RFC 9239 (2022) made it the standard and marked application/javascript as obsolete, although browsers accept both.
What if an extension is not listed?
Serve the file as application/octet-stream, which tells the browser to download it rather than display it.
Why does a text type need a charset?
Without one, browsers and clients may guess the encoding and show Korean, Chinese or accented text as gibberish. utf-8 is the safe choice for web text.
Is the extension a reliable way to know a file's type?
No — anyone can rename a file. Servers that accept uploads should check the content (magic bytes) as well.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/mime-type-lookup/
Cite or embed this tool
kakaoCalc. (2026, November 8). MIME Type Lookup (File Extension ↔ Content-Type). https://kakao.mobile/tools/mime-type-lookup/
“MIME Type Lookup (File Extension ↔ Content-Type).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/mime-type-lookup/.
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