CyberChef
GCHQ's free "cyber Swiss army knife": decode, unwrap and analyse text, links and files in your browser.
What you can do with it
- Decode Base64 and other encodings
- See where a tracking link really goes
- Check a download's SHA-256 fingerprint
The full tutorial
01Open CyberChef and learn the four boxesFREE02Let Magic decode it for youFREE03Unwrap a tracking linkFREE04Unmask a scam link hiding inside another linkFREE05Make a suspicious link safe to shareFREE06Check a download is the real thingFREE07Final challenge: crack a three-layer messageFREE
Decode anything with GCHQ's CyberChef · ~20 min · tested 2026-10-07
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