ULID Generator
Generate time-ordered ULID identifiers with Crockford base32 encoding. Input never leaves your device — everything runs locally in your browser.
How to Use the ULID Generator
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Frequently Asked Questions
What is a ULID?
ULID (Universally Unique Lexicographically Sortable Identifier) is a 26-character string that is time-ordered and collision-resistant. Format: 48-bit timestamp + 80-bit randomness in Crockford base32.
How is ULID different from UUID?
ULIDs are lexicographically sortable by creation time. UUIDs (v4) are random and not sortable. ULIDs are shorter (26 chars vs 36) and more database-friendly.
Can I extract the timestamp from a ULID?
Yes. The first 10 characters encode the Unix timestamp in milliseconds. You can decode them to find the exact creation time of any ULID.
How many ULIDs can I generate?
Generate 1 to 20 ULIDs per batch with the slider. Each ULID is unique even at millisecond granularity due to the 80-bit random component.
Is generation done locally in ULID Generator?
Yes. All generation runs in your browser. No data is transmitted.
What is the ISO timestamp under each ULID?
It decodes the ULID first 10 chars (48-bit ms timestamp) back to an ISO date — proof of time-ordering. Each ID is 26 Crockford chars (10 time + 16 random); the slider batches 1-20.
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Last updated October 2026