Generate v4 UUIDs / GUIDs in your browser.
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UUIDs are 128-bit identifiers globally unique without a central authority — perfect for primary keys, request IDs, file names and event tracking. This generator produces RFC 4122 v4 UUIDs (random) in any quantity. The Web Crypto API supplies the randomness, so the IDs are safe to use as security tokens. Generate one or thousands; nothing leaves your browser.
Adjust the settings that shape your uuid — length, style, character sets, or any format flags shown above the preview.
Click the generate button to produce a fresh, unique uuid using your browser's cryptographic random source.
If the first result doesn't fit, regenerate as many times as you like — each output is independent.
Copy the value to your clipboard or export it as a file for use in your project, config, or account.
UUID Generator solves the problem of producing high-entropy, correctly-formatted values on demand without opening a terminal or hunting for a snippet on Stack Overflow. Whether you need a value for a config file, a test fixture, a demo, or a production credential, having a trustworthy generator one click away removes friction from a dozen tiny workflows a week. Toolzer's design philosophy is simple: privacy-first (no tracking, no accounts), performance-first (the page is interactive in under a second on a 3G connection), and honesty-first (no fake ratings, no dark patterns, no upsells). UUID Generator follows the same rules as every other utility on the site. You can bookmark this page, share the URL with a colleague, or pin it to your browser's toolbar — the experience will be identical every visit, and it will keep working even if you're on airplane Wi-Fi. Real people use this tool for real work — freelancers cleaning up client deliverables, sysadmins triaging tickets, students finishing assignments — and it is tuned for those workflows, not for demo videos.
Statistically no. You would need to generate about a billion UUIDs per second for ~80 years to reach a 50% collision chance.
v4 is random. v7 is time-ordered and pairs perfectly with database B-tree indexes — recommended for new systems.
v4 from a CSPRNG is unguessable enough for session tokens. v1 leaks the MAC address and timestamp — avoid for security.
Binary (16 bytes) is half the size and faster to index. Use the UUID type in Postgres; BINARY(16) in MySQL.
No. Every utility on Toolzer is free, anonymous, and works in any modern browser without registration.
Yes. Whenever the tool can produce an answer entirely in the browser, the data never leaves your device.
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