Mime Lookup
Look up an embedded MIME mapping for a file extension. The reference can help draft server settings or upload policies, but it does not inspect file bytes to establish the actual format.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Loading the tool. If it does not appear, reload this page.
How to use this tool
Enter an extension or filename. The lookup normalizes case and ignores URL query or fragment text; check the real response Content-Type separately when diagnosing a server.
Results and examples
Looking up photo.png can return image/png. Renaming an arbitrary file with a .png ending does not convert its contents into PNG image data.
Limitations
- The embedded table is not a live copy of every IANA media-type registration.
- Extension lookup must not replace security validation of uploaded content.
Fields
| Field | Guidance and constraints |
|---|---|
| Extension or filename | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Does renaming a file convert its type?
Looking up photo.png can return image/png. Renaming an arbitrary file with a .png ending does not convert its contents into PNG image data.
Are the file bytes inspected?
The embedded table is not a live copy of every IANA media-type registration. Extension lookup must not replace security validation of uploaded content.
