Password Strength Checker — Free & Private

A free edge API by formatho.com, privacy-first developer tools.

Open the full browser tool →

Free, no signup, runs entirely in your browser — your data never leaves your device.

🔓 Free🔒 Zero tracking🚫 No data collection⚡ Edge-fast

Usage

curl -X POST https://password-strength-formatho.filesformatho.workers.dev/api -H 'Content-Type: application/json' \
  -d '{"password":"MyS3cur3P@ss!"}'

Returns entropy bits (charset model + effective after pattern penalties), a 0–6 score, six compliance checks (12+ chars, upper, lower, digits, symbols, not-common), crack-time estimates for five attack scenarios, detected patterns, and concrete improvement suggestions.

Prefer POST for real passwords — GET query strings can land in server logs. Analysis runs in-memory at the edge; nothing is logged or stored.

Full parameter reference: /api endpoint.

Privacy-first: the analysed password never leaves memory — no logs, no storage, no telemetry.

Full browser tool

Analyse with a full UI: Password Strength Analyser on formatho.com. Need strong passwords? Generate one.

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