Password Seed Generator

Generate and inspect ID/random/timestamp values in your browser. No input is sent to a server. Use it for first-pass spec compliance checks.

Status

Strength

Runs in your browser. No input is sent to a server. Use this as a first-pass diagnostic step.

How to use

Set a seed and click Generate. With the same settings and seed, results are reproducible. For batch output, adjust count and grouping.

Notes (this tool)

  • Treat seeds as sensitive data. If leaked, the same outputs can be reproduced.
  • Use separate seeds per purpose and avoid reuse to reduce operational mistakes.

About this page

What does this tool do?

Generate reproducible passwords from a seed and constraints (length/character sets).

Useful when you only store a seed and derive passwords on demand.

Typical use cases

  • Create consistent passwords per environment
  • Store only a seed to reproduce later
  • Generate consistent patterns for testing

Recommendations (practical)

  • Use different suffix values per service to avoid password reuse across systems
  • Keep seed long and random; avoid storing it in plaintext notes or chats
  • Pair production usage with a password manager and MFA

Notes

  • Same seed yields the same output (beware reuse)
  • If the seed leaks, derived outputs become easier to predict. Protect seed management first.
  • Not a replacement for dedicated KDFs (Argon2/PBKDF2/scrypt). Use purpose-built designs for high-security needs.

What this tool does

  • Reproducible password generation from a seed
  • Control length and character sets
  • Generate a random seed

Debugging workflow (recommended)

  • Generate or paste a value
  • Check format, timestamp, and character constraints
  • Confirm against destination validation requirements

Referenced specs

  • NIST SP 800-63B (Memorized Secrets)
  • RFC 8018 (PBKDF2)
  • RFC 9106 (Argon2)

FAQ

Is deterministic output from the same seed a problem?

It depends. Determinism is useful, but seed leakage has high impact, so strict seed protection is required.

Can I reuse the same seed across services?

No. Separate outputs per service using different suffixes or namespaces.

References

  1. NIST SP 800-63B
  2. RFC 8018
  3. RFC 9106

These links are generated from site_map rules in recommended diagnostic order.

  1. URL Safe Random — Generate random strings using URL/filename-safe characters
  2. Random Password — Generate random passwords with length, charset, and exclusion options
  3. Cookie Security Audit — Audit Secure/HttpOnly/SameSite settings
  4. Password Policy Generator — Create policy text and validation regex from requirements

Example

seed: my-app-prod
len: 20
sets: lower/upper/digit