Content-Type developer utility

CorrectMIME

Paste a Content-Type or MIME media-type value to check its syntax and canonical form. This tool validates the value itself; it does not identify a file's MIME type.

Validate a Content-Type value

What it checks

Type and subtype syntax, including structured suffixes such as +json
Parameters, separators, optional whitespace, and quoted values
Duplicate or malformed parameters and canonical formatting

CorrectMIME checks syntax. It does not inspect file bytes, fetch HTTP headers, or confirm that a value is registered with IANA.

Troubleshoot common syntax problems

Content-Type charset errors Check charset placement, separators, quoting, and duplicates. MIME and Content-Type parameter errors Diagnose missing values, malformed quotes, and semicolon syntax.

Working with other structured formats?

Validate and repair calendar files with CorrectICS, contact files with CorrectVCF, RSS/Atom/OPML feeds with CorrectFeed, or browse all CorrectFormats tools.