CalcBrew

UUID Generator

Generate random version 4 UUIDs or time-ordered version 7 UUIDs — one at a time or up to 500 in bulk — formatted in lowercase, uppercase, without hyphens or wrapped in braces for C#/.NET. Every ID comes from your browser’s cryptographic random generator.

By Miikka · CalcBrew · Updated

0 UUIDs · version 4 · 122 random bits

    Share:

    Anatomy of a UUID

    v4: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx  (x = random hex, y = 8/9/a/b)

    v7: tttttttt-tttt-7xxx-yxxx-xxxxxxxxxxxx  (t = Unix time in ms, 48 bits)

    Other versions exist: v1 embeds a timestamp and the machine’s MAC address (avoid — it leaks hardware identity), v3 and v5 are deterministic hashes of a name (MD5 / SHA-1) that always give the same UUID for the same input, and v6 is v1 with the timestamp bytes reordered. In practice new code needs only v4 and v7.

    Generate in code: JavaScript crypto.randomUUID(), Python uuid.uuid4(), Go uuid.New(), PostgreSQL gen_random_uuid() (v7 arrives in PostgreSQL 18), .NET Guid.NewGuid() and Guid.CreateVersion7().

    Frequently asked questions

    Cite this calculator
    APACalcBrew. (2026). UUID Generator. https://calcbrew.com/uuid-generator
    MLA“UUID Generator.” CalcBrew, 2026, calcbrew.com/uuid-generator.

    Link to https://calcbrew.com/uuid-generator. Results are estimates; cite the underlying formula or data source for academic work.

    Related tools

    XML Formatter & BeautifierFree online XML formatter: pretty-print messy XML with 2 or 4 spaces or tabs, validate it and see the exact…Base64 Encode & Decode OnlineFree Base64 encoder and decoder: convert text to Base64 and Base64 back to text (UTF-8 safe), URL-safe…CSS Formatter & BeautifierFree CSS formatter: beautify minified or messy CSS with consistent indentation (2 or 4 spaces, tabs), one…CSS MinifierFree CSS minifier: strip comments, whitespace and redundant syntax to shrink a stylesheet by 20–40 % without…HTML Encoder & DecoderFree HTML encoder and decoder: escape < > & " ' as HTML entities so code shows as text, optionally encode…JavaScript Formatter & BeautifierFree JavaScript formatter: beautify minified or messy JS with Prettier — 2 or 4 spaces or tabs, semicolons…

    More in Developer Tools · All tools & games