A ULID is a 26-character identifier made of a 48-bit timestamp followed by 80 bits of randomness, encoded in Crockford base32. It is lexicographically sortable by time, case-insensitive, and URL-safe — a popular alternative to UUIDs.

How is a ULID different from a UUID v7?

Both put a millisecond timestamp first so they sort by creation time. ULIDs use a compact 26-character base32 string, while UUID v7 keeps the canonical hyphenated hex format. ULIDs are shorter and avoid hyphens.

Are ULIDs generated privately?

Yes. The timestamp and 80 random bits come from your browser's Web Crypto, and nothing is uploaded — generation happens entirely on your device.

ULID Generator — Gera Tools

URL-safe ULID generator

A ULID is a 26-character identifier: a 48-bit timestamp followed by 80 bits of randomness, encoded in Crockford base32. That layout makes ULIDs lexicographically sortable by creation time, case-insensitive, and free of characters that need URL escaping — a compact, friendly alternative to UUIDs.

Compared with hyphenated UUIDs, ULIDs are shorter and cleaner in URLs and logs while keeping global uniqueness and time-ordering. Generate one or a sortable batch of up to a thousand, optionally lowercase, all in your browser — nothing is uploaded.