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Secure password hashing with adaptive salt. Generate and verify Bcrypt hashes locally. Free online tool, no login, no sign-up.

LocalPersonal data security

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Usage Guide & Tech FAQ

Usage Guide

  1. Enter the password or test string; don’t demo real user passwords on shared screens.
  2. Pick a cost/work factor—higher is slower and stronger, but balance login latency (often start around 10–12).
  3. Store the entire bcrypt string; verification APIs need the stored hash plus the plaintext candidate.
  4. Different hashes for the same password are normal (random salt); never compare plaintext to “expected hash” manually.
  5. Confirm whether your stack accepts `$2a$` vs `$2b$` identifiers without rewriting them.
  6. Remember bcrypt only processes the first 72 bytes—long passphrases may need a pre-hash policy agreed with peers.
  7. When migrating algorithms, rehash on successful login and update stored values.
  8. Bulk imports must keep original hashes intact—re-salting breaks verification.
  9. Benchmark cost in staging before applying to production baselines.
  10. Clear inputs to avoid clipboard leaks of real passwords.
  11. Read the title and description first to confirm this utility matches your task (avoid using the wrong tool and misinterpreting output).
  12. Paste or type input in the editor; if a sample/template is provided, load it first to learn the expected output shape.

Related Tech Knowledge

  • bcrypt embeds salt and cost in its output string; verification recovers those parameters automatically.
  • It is a slow hash based on Blowfish, aimed at resisting offline brute force.
  • Compared to Argon2/scrypt, bcrypt is weaker as a memory-hard function but still common in legacy stacks.
  • The 72-byte limit is a property of bcrypt; pre-hashing changes the threat model and needs review.
  • GPUs/ASICs still speed up guessing—pair with MFA and rate limits.
  • Browser bcrypt is often for demos or client-side prehashing; servers should remain authoritative verifiers.
  • Use library `verify` APIs instead of string-equal on hashes—though verify itself should be constant-time internally.
  • Revisit cost over time as hardware improves; upgrade transparently on login.
  • Don’t reuse bcrypt outputs as generic key material—keep the primitive single-purpose.
  • Hashes are computed locally with safeguards for personal data.
  • Core parsing and computation run in your browser; by default your raw business payload is not persisted to this site’s servers (see on-page privacy notes).
  • The pipeline is typically: read input → parse (lexical/syntactic/structured) → transform → render; failures aim to be diagnosable.