Check MIME Type (Signature Verification)

Detect true MIME types using magic byte signatures and compare with browser-reported types.

How It Works & Processing Standards

Detect true MIME types using magic byte signatures and compare with browser-reported types.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Desktop max file size: 100MB
  • Mobile max file size: 40MB

Check MIME Type (Signature Verification) is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Check MIME Type (Signature Verification)

  1. 1
    Select FilesPick files to inspect.
  2. 2
    Inspect SignaturesCompare browser MIME type with magic byte signature detection.

Common Use Cases

  • Verifying whether uploaded documents match their declared media formats
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