File Type Detector
- Choose File→
- Options→
- Result
Quick start
Identify a file by its contents and keep a portable technical report.
- Choose any file
- Compare its signature, MIME and extension
- Copy or download JSON
File Type Detector
Upload a file with a missing, wrong, or suspicious extension to inspect what it actually is. The detector checks file signatures and basic metadata to distinguish images, documents, archives, audio, video, and other formats before you open or convert the file.
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The detector analyzes file content, so it can catch cases where the extension and the real format do not match.
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Detection confidence is shown as a percentage, with a warning when the result should be reviewed manually.
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The report compares browser MIME, server MIME and detected MIME so upload bugs are easier to diagnose.
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SHA-256 helps identify the exact file and compare it with other reports without opening the file again.
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The first bytes and text preview make common file signatures and plain-text content visible in a controlled way.
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The file is analyzed from the temporary upload request and is not added to the user file list.
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