File MIME Type Checker
Safely determine a file's true MIME type (Media Type) based on its binary content signatures, processed securely in your browser.
Analyzing...
Reading file signatures locally...
Select your file below for instant analysis. No files are uploaded to our servers.
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How to Use File MIME Type Checker
Find out what a file really is — even if its name or extension is wrong — by reading the first bytes of the file.
Choose a File
Drop a file or click to pick one from your device.
We Read Its Signature
The first bytes of the file are checked — the file is never uploaded.
See the Real Type
Get the MIME type, like image/jpeg or application/pdf.
Detects
Images, video, audio, docs
Method
File signature
iPhone
HEIC & AVIF photos
Privacy
Runs in your browser
Price
100% free
Sign-up
Not needed
File MIME Type Checker: Quick Reference
The key numbers and facts in one place.
| JPG | image/jpeg |
|---|---|
| PNG | image/png |
| iPhone photo (HEIC) | image/heic |
| application/pdf | |
| MP4 video | video/mp4 |
| Word (.docx) | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| ZIP | application/zip |
What Can You Use It For?
Popular ways people use File MIME Type Checker.
Unknown Files
Find out what a file with no extension is.
Upload Errors
See why a site rejects your file.
Developers
Check the Content-Type to send.
Safety Checks
Spot files pretending to be something else.
Tips for the Best Result
- Text files (CSV, CSS, JS) have no signature — their type comes from the name.
- Word, Excel and PowerPoint files are ZIP inside; we use the name to tell them apart.
- An EXE renamed to .jpg will still show as an EXE.
Frequently Asked Questions
Quick answers about File MIME Type Checker.
A label that tells apps and websites what kind of file it is, like image/png or application/pdf.
No. Only the first few bytes are read, inside your browser.
iPhones save photos as HEIC by default. Many websites need JPG — convert it first.
That long name is the official MIME type for Word documents.
Yes.
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