Look up MIME type

Look up a MIME type or file extension in the IANA media registry.

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ToolMIME Type Lookup
Input
Output
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How it works

A normalized extension or media type is matched against IANA registrations, returning names and common extensions plus available notes. Extension lookup is a hint and cannot prove file contents.

  • IANA names support interoperable Content-Type headers.
  • Local and vendor types can exist outside the registry.

Worked example

Look up MIME type for .json files
Find the MIME type, description, and category for JSON file extension
Input
											json
Output
												Extension: json
MIME type: application/json
Description: JSON data
Category: application

When to use this

HTTP responses, upload forms, and web-server mappings look up media types.

Edge cases

  • A .json name does not prove valid JSON.
  • One extension can have vendor or historical types.
  • Content sniffing can disagree with a declaration and create risk.

References