Useful
tools
Everything runs right here in your browser. What you paste never leaves this page — only DNS lookups go to Google Public DNS, Whois asks the domain or IP registry, My IP asks ipwho.is, and the calculator fetches exchange rates.
- 21 tools
- 0 uploads
- EN · RU calculator
JWT decoder
Decodes a JSON Web Token: header, payload and claims with readable dates, and tells you if it has expired. Paste the secret to verify an HS256 / HS384 / HS512 signature — the token never leaves this page.