MIME Type Lookup

Look up common media types, parse Content-Type safely, inspect local file signatures, detect extension/type mismatches, and test Accept negotiation without uploading files.

Local file inspection · no upload

Extension or media type

Common web & document formats

Type inspector

Choose a media type.

Inspect a local file

Bytes stay in your browser

Drop a file here or click to choose

Reads only the first bytes needed for local signature inspection.

Declared Content-Type (optional)

Consistency report

Choose a file to compare filename extension, browser metadata, declared type and magic bytes.

Content-Type parser / builder

Content-Type

Media type

Charset

Accept negotiation tester

Accept header

Server offers · one per line

Media type ≠ file extension

Extensions are conventions. Servers should send an accurate Content-Type, and security-sensitive workflows should inspect content rather than trust names alone.

Structured suffixes

Types ending in +json, +xml, +cbor and similar suffixes communicate a base representation while preserving application-specific semantics.

No MIME sniffing surprises

For untrusted web content, accurate types plus X-Content-Type-Options: nosniff help prevent browsers from interpreting content as a different active format.

Registry scope

The IANA media-type registry is much larger than an extension table and is updated continuously. This tool embeds a high-value offline lookup set for common web, document, media, archive and developer formats, while its parser accepts any syntactically valid type. For formal registration status, verify against the live IANA Media Types registry.