What this tool does
MIME Type Lookup completes Extension → MIME, MIME → Extensions, and Keyword Search using static mapping tables deployed with the project. It does not query online databases or GitHub; multiple extensions for the same MIME are listed in full.
- The extension can be entered with or without the leading period, ignoring common case differences.
- The reverse lookup retains all known extensions corresponding to a MIME.
- Mapping is used for common development scenarios; the final server Content-Type should still be confirmed in conjunction with file content and platform rules.
How to use it
- Enter an extension, MIME Type, or keyword.
- Click "Query MIME".
- See exact matches and related results.
- Copy the required MIME or extension list.
Common uses
- Query common Content-Types for JSON, images, fonts, and media files.
- Reverse lookup of possible file extensions from response MIME.
- Search type families such as image, audio, or archive.
Privacy and security
Inputs and results are processed only in your browser's memory. Nothing is uploaded, sent to an online API, or stored automatically.
MIME Type Lookup Features
Look up file extensions and MIME types in either direction, or search by keyword, using a local mapping. Useful for everyday development and debugging; results can be reviewed, copied, or downloaded immediately.
FAQ
What is the MIME Type of JSON?
A common standard type is application/json.
Why do JPG and JPEG produce the same results?
They are common extensions for the same image format, and usually map to image/jpeg.
Will unknown extensions be automatically queried online?
No. The tool only searches local mappings and explicitly says there is no match.
Can MIME Type prove file security?
No. Both extensions and declared MIME can be unreliable, and security scenarios also require verification of the actual file content.