Web Tools
ULID Generator
Generate and parse ULIDs (Universally Unique Lexicographically Sortable Identifiers). Cryptographically random, timestamp-embedded, and sortable. Batch generation up to 1000. Runs entirely in your browser — your data never leaves your machine.
ulid uuid identifier sortable generator crypto
Published May 30, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Generate ULIDs with embedded timestamps and cryptographic randomness, or parse existing ULIDs to extract their timestamp and validate their format. ULIDs are 26-character Crockford Base32 strings that sort lexicographically by creation time.
Features
- Generate: single or batch ULID generation (up to 1000)
- Parse / Validate: extract timestamp, randomness, and validate format
- Crockford Base32: case-insensitive, no ambiguous characters (I, L, O mapped)
- Cryptographic randomness: uses Web Crypto API for the 80-bit random component
- Timestamp embedded: 48-bit millisecond Unix timestamp, extractable via parse
- Lexicographic sorting: ULIDs created later sort after earlier ones
- Batch generation: generate 1, 5, 10, 25, or 50 ULIDs at once
- Private: runs entirely in the browser — no data transmitted
Use Cases
- Generating sortable primary keys for databases
- Creating unique identifiers without coordination (no central authority)
- Replacing UUIDs when lexicographic sorting is needed
- Extracting creation timestamps from existing ULIDs
- Testing ULID implementations and parsers