ULID Generator - Generate Universally Unique Lexicographically Identifiers
Generate 26-character time-ordered, URL-friendly Universally Unique Lexicographically Sortable Identifiers (ULIDs) in bulk.
This tool runs in your browser.
Processed locally in your browser.
How to use
- 01Enter or upload the source data.
- 02Run the tool in your browser.
- 03Review, copy, or download the result.
FAQ
What advantages do ULIDs have over standard UUID v4?
ULIDs incorporate a 48-bit millisecond timestamp upfront, enabling natural chronological sorting and preventing database index page fragmentation.
What character set does ULID employ?
ULID uses Crockford's Base32 encoding (26 characters), which is case-insensitive and eliminates visually ambiguous letters like I, L, O, and U.
Can ULIDs collide when generated concurrently?
Collision is practically impossible thanks to 80 bits of cryptographic randomness alongside monotonic incrementation within the same millisecond.