Generate time-ordered ULID identifiers with Crockford base32 encoding. Input never leaves your device — everything runs locally in your browser.
Content reviewed October 2026 · About Toolzum
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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.
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.
Yes. The first 10 characters encode the Unix timestamp in milliseconds. You can decode them to find the exact creation time of any ULID.
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.
Yes. All generation runs in your browser. No data is transmitted.
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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