Identify a File's Real Type

Check a file's magic number to see what it actually is.

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Any file aucune limite de taille de fichier

Parcourir les fichiers

Vos fichiers ne quittent jamais votre appareil. Tout le traitement se fait localement dans votre navigateur.

Inspect the raw bytes of any file — offset, hex, and ASCII columns, like a classic hex editor. The file is read locally and never uploaded.

file identification tips

🔎

The first bytes (magic number) reveal the true format regardless of the file extension.

🏷️

The tool names common types automatically — PNG, PDF, ZIP, MP4, and more.

🕵️

Useful when a file has the wrong or no extension, or you suspect it's mislabeled.

🔒

Read locally — safe for unknown files.

Choisir un fichier

Drop your file into the tool above. It stays entirely on your device — nothing is sent to any server.

Traiter

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Télécharger

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

✓Entièrement gratuit — sans coûts cachés, jamais

✓Aucun compte, e-mail ou connexion requis

✓Les fichiers ne quittent jamais votre appareil

✓Aucune limite de taille de fichier

✓Aucun filigrane sur aucun résultat

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Learn How File Formats Work

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