NanoID / ULID generator

Generate URL-safe NanoIDs in custom alphabets and lengths, or sortable ULIDs, with crypto-quality randomness.

ID type

Generated with crypto.getRandomValues in this browser.

NanoID uses the standard 64-character URL-safe alphabet at length 1–512. ULID encodes the current timestamp + 80 random bits; IDs generated in the same millisecond are not ordered. Up to 100 per run.

How to use

  1. Pick NanoID or ULID.
  2. Set the count (and alphabet/length for NanoID).
  3. Generate and copy the list.

What it supports

Uses crypto.getRandomValues with rejection sampling for uniform output. ULIDs encode a 48-bit millisecond timestamp plus 80 random bits. Up to 100 IDs per run, NanoID length up to 512.

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