Identifier generators: UUID, GUID, ULID and NanoID
Generate UUID v4 and v7, ULID and NanoID, then validate and decode existing identifiers — all in the browser.
5 tools in this section
UUID v4, v7 and v1 in batches of up to 1,000, with formats and encodings.
UUID validatorChecks the format, version and variant, and explains any error.
UUID decoderShows the version, variant, fields and creation time of v1, v6 and v7.
ULID generator26-character sortable IDs: a timestamp plus 80 random bits.
NanoID generatorShort URL-safe IDs with a configurable length and alphabet.
How to choose a tool
Identifiers exist so a record gets a name before a database sees it. Generate a UUID of the right version, validate someone else’s identifier, or decode its fields — without installing packages or sending values anywhere.
Every calculation runs in your browser: the page never sends the numbers you type to a server and keeps no history. If a result raises questions, each tool page ends with short answers about allowances and limitations.