ULID Generator & decoder
Generate cryptographically random ULIDs in your browser, batch up to 500, and decode timestamps from existing ULIDs. No server calls.
Frequently asked questions
No. ULID bytes are assembled in-browser. Nothing is sent to LocalTools servers for processing.
ULIDs are lexicographically sortable by time and include randomness; great for ordered logs and keys.
Related guides
- ULIDs for sortable IDsHow ULIDs pack a millisecond timestamp and randomness into 26 Crockford base32 characters, why they sort chronologically as plain text, and when to pick them over UUID v4 or NanoID.
- UUID versions (and when v4 is enough)How RFC 4122 UUIDs encode version and variant bits, what versions 1–5 mean in practice, and why random version 4 IDs are the right default for most applications.