Our free Secure UUID Generator provides an in-browser generation tool to create RFC 4122 Version 4 random UUIDs / GUIDs. Uses the browser's native Web Crypto API (crypto.getRandomValues) to deliver cryptographically secure pseudo-random numbers suitable for database primary keys, session tokens, and API identifiers. Supports bulk batch generation from 1 to 500 UUIDs per run. Customize formatting options including letter case (lowercase vs uppercase), standard hyphenation vs compact strings, curly braces ({...}), URN prefix (urn:uuid:), and output styles (plain text list vs JSON array format). Select from pre-built presets and export results directly to uuids.txt or uuids.json. Executing 100% in local client-side JavaScript—your generated UUIDs are never transmitted to external servers.
Choose the number of UUIDs (1-500), case (lowercase/uppercase), hyphens, braces, or JSON array format.
Click Generate UUIDs or select a preset (Single, Bulk 10, DB Batch 50, JSON Array).
Copy all generated UUIDs to your clipboard or download uuids.txt / uuids.json.
Leverages the browser's Web Crypto API (crypto.getRandomValues / crypto.randomUUID) for production-grade CSPRNG entropy.
Generate up to 500 UUIDs per run formatted with custom uppercase, hyphens, curly braces, URN prefixes, or JSON arrays.
All UUID generation, string formatting, and file exports execute locally in your browser. Generated identifiers are never stored on any server.
A Universally Unique Identifier Version 4 (UUID v4) is a 128-bit number constructed per RFC 4122 specifications using 122 random bits combined with 6 fixed version (0100 for v4) and variant bits.
Randomness is derived directly from the browser's Web Crypto API (crypto.randomUUID() or crypto.getRandomValues()), ensuring cryptographically secure pseudo-random number generation (CSPRNG) for production primary keys.
With \(2^{122}\) (\(pprox 5.3 imes 10^{36}\)) possible unique combinations, the mathematical probability of a single UUID collision occurring in practical database systems is virtually zero.