Learn How File Formats Work

Explore the byte structure of real files to understand formats.

Ingen inloggning krävsFiler förblir privata

Släpp filer här, eller klicka för att bläddra

Any file ingen filstorleksgräns

Bläddra bland filer

Dina filer lämnar aldrig din enhet. All bearbetning sker lokalt i din webbläsare.

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.

learning tips

🎓

Compare the headers of a PNG, a PDF, and a ZIP to see how formats announce themselves.

🔢

Seeing real bytes alongside ASCII makes format specs much easier to follow.

🧩

A hands-on way to understand magic numbers and headers.

🔒

Experiment freely — nothing is uploaded.

Välj fil

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

Bearbeta

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

Ladda ner

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

✓Helt gratis — inga dolda kostnader, någonsin

✓Inget konto, e-post eller inloggning krävs

✓Filer lämnar aldrig din enhet

✓Inga filstorleksgränser överhuvudtaget

✓Inga vattenstämplar på någon utdata

Identify a File's Real Type

Check a file's magic number to see what it actuall

Debug a Binary File

Inspect headers and bytes while debugging a file f

Find Text Strings in a File

Spot readable text embedded in a binary file.

Inspect a Suspicious File Safely

Examine an unknown file's bytes without opening or