Security & Crypto Tools
TOTP Generator & Verifier
Generate and verify time-based one-time passwords (RFC 6238).
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What is TOTP?
A TOTP tool compatible with authenticator apps: it derives the current time-based one-time password from a Base32 secret and verifies codes.
How it works
The secret is Base32-decoded, the time counter is HMAC-SHA1-signed via Web Crypto, and the dynamic truncation yields the 6/8-digit code.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Paste or type any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.