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MIME Type

Look up MIME types from file extensions, filenames, and media types, then copy MIME or Content-Type header values locally.

Characters

0 / 256

Lookup runs locally as you type. Long filenames and paths stay in this field.

Examples

Lookup result

Enter an extension or MIME type

Use a file extension, filename, path, or media type.

File signature check

Read the first 8 KB locally and compare browser, extension, and magic number MIME values. The file is not uploaded or saved.

File count

0 / 1

Total size

0 bytes / 25 MB

Single-file limit

25 MB

MIME catalog

Change the query or category filter to browse more MIME types.

MIME Type

Quick start

1
Enter extension, filename, or MIME type
2
Check MIME, Content-Type, charset, and extensions
3
Filter catalog by category
4
Copy MIME, header, or extensions

Common scenarios

HTTP headers

choose a Content-Type value for API responses or static assets

Upload rules

prepare accept lists and extension hints

Data URLs

keep the MIME part beside Base64 payloads

Web assets

check AVIF, WebP, WASM, WOFF2, SVG, and webmanifest types

Usage advice

Extension lookup is a convention lookup, not file-content verification
Use the Content-Type header value when configuring HTTP responses
Text and JSON-like types often include UTF-8; binary formats usually do not

MIME lookup boundaries

Extension lookup is not file-content verification. The optional file check reads only the first bytes and compares common magic numbers.
Do not use extension lookup as a security decision
The catalog follows the installed MIME database and may not include every private vendor type
Unknown extensions can use application/octet-stream only as a generic fallback when your system accepts a binary default

URL Quick Fill

Prefill the lookup query from the URL hash. query is required and capped at 256 characters. Category filtering uses the current tool setting and does not have a URL parameter.
query: Extension, filename, or MIME type to look up (required, up to 256 characters)
Example: #query=image/webp
Hash parameters stay in the browser for tool prefill; CrateX.app does not record them.
Do not put private filenames, internal paths, or sensitive text in URLs.

Privacy and security

Processing runs in your browser. The lookup query and category filter may stay in the current browser session or browser storage. If you save a workspace or enable WebDAV sync, those values may be saved according to your sync settings. Lookup results, Content-Type header examples, charsets, and extension lists are derived from the local MIME catalog and current query, and are not stored as separate results. File signature checks read only the first 8 KB locally; chosen file inputs and detected file results are not uploaded, saved, shared, or synced. This page does not fetch URLs. On shared devices, clear the query and site data when needed.

FAQ

14

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All tool processing happens locally in your browser.