File Magic Byte Detector
Free File Magic Byte Detector on AboveTool. Inspect files, hashes, magic bytes, and encodings in your browser — private, no upload.
File Magic Byte Detector
identifies formats from leading signature bytes even when the extension is wrong
Drop files here or click to browse
Processed entirely in your browser
Private by design — files and text stay on this device. Results are indicative helpers, not forensic certification.
About File Magic Byte Detector
File Magic Byte Detector is identifies formats from leading signature bytes even when the extension is wrong. It works by calculating reads local File/ArrayBuffer data, applies byte and text analysis, then shows results on-page. Compare magic type with the filename extension to catch spoofed downloads. File Magic Byte Detector runs free in your browser at abovetool.com — no signup, instant results.
How to use
- Upload a file or paste text, depending on the tool.
- Tune options such as byte limit, hash algorithm, or encoding.
- Click Analyze to inspect bytes, hashes, MIME clues, or text — all locally.
Features
- Magic-byte, hash, hex, entropy, and string analysis
- Multi-file compare and extension/magic validation
- Text encoding, MIME lookup, and line-ending tools
- 100% private — files never leave your browser
Frequently asked questions
What is File Magic Byte Detector for?
File Magic Byte Detector is identifies formats from leading signature bytes even when the extension is wrong.
How does File Magic Byte Detector calculate the result?
It calculates reads local File/ArrayBuffer data, applies byte and text analysis, then shows results on-page.
Any tips for using this calculator?
Compare magic type with the filename extension to catch spoofed downloads.
Is File Magic Byte Detector free on AboveTool?
Yes. File Magic Byte Detector is free to use on abovetool.com with no account required, and results are calculated instantly in your browser.