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ULID / NanoID Generator

Generate time-based ULIDs or compact URL-friendly NanoIDs. Configure options and generate. Results stay only in this page.

ULIDs have 26 characters and expose their timestamp; do not use them as secret tokens. NanoID uses a URL-safe alphabet.

All computation runs in a local Worker. Inputs/results are never uploaded, logged, placed in URLs or saved automatically. Changing parameters clears old results; leaving clears results. Manage exported files and clipboard content yourself. Maximum output: 2 MiB.

How to use & limits

ULID uses a 48-bit timestamp and 80 random bits. Order within one millisecond is not guaranteed. NanoID defaults to 21 URL-safe characters; shorter IDs increase collision risk. Neither mode guarantees global uniqueness.