CEZAMBlog

UUID generator

v4 and v7, in batches.

/ 100
Generating…
    • 100% local — your data never leaves your browser
    • Free, no usage limits
    • No sign-up, no account

    What this tool does

    Version 4 is drawn at random by your browser (crypto.randomUUID). Version 7, defined by RFC 9562, starts with a 48-bit millisecond timestamp: identifiers created at different times therefore sort in generation order. Batches go from 1 to 100; the uppercase and no-dash options reformat the current batch without regenerating it.

    Everything is drawn locally in your browser: nothing is sent, nothing is stored.

    Limitations

    A v7 UUID reveals when it was created; prefer v4 if that matters. Within the same millisecond, the sort order of two v7 identifiers is not guaranteed.

    A UUID is not a secret: never use these identifiers as a password or access token.