--- title: UUID Generator: Free Online Tool | Relic description: Free UUID generator. Create random version 4 UUIDs using your browser's secure random source, one at a time or in bulk, and copy them in a click. canonical: https://relic.space/tools/uuid-generator source: https://relic.space/llms.txt --- # UUID Generator Generate random version 4 UUIDs using your browser's secure random source, one or fifty at a time. Free and private. Runs entirely in your browser. Nothing you type is uploaded. How many (1 to 50) 0 UUIDs ## Random version 4 UUIDs, on tap A UUID is a 128-bit identifier unique enough that you can mint one anywhere without checking a central list, which is why they show up as database keys, request IDs, and file names. This **UUID generator** uses your browser's built-in secure random source to produce standard version 4 UUIDs, one at a time or fifty at once. Copy a single line or grab the whole batch. Nothing is generated on a server, so the values are yours alone. ## Find the ID you used yesterday The hard part is rarely making an ID. It is finding the one you already used. **Relic** keeps an end-to-end encrypted, searchable history of everything you copy, on every device, so the UUID you pasted into a test yesterday is one search away today. Generating them is free. Never losing track of them is what Relic is for. **Learn:** new to UUIDs, or wondering when to use v4 vs v7? Read [What is a UUID?](https://relic.space/blog/what-is-a-uuid) ## Frequently asked questions What is a UUID?+ A UUID (universally unique identifier) is a 128-bit value, usually written as 32 hexadecimal digits in five dash-separated groups. It is unique enough that you can mint one anywhere without checking a central registry, which is why UUIDs are used for database keys, request IDs, and file names. Which UUID version does this generate?+ Version 4, the random kind. It uses your browser's built-in secure random source (crypto.randomUUID), so 122 of the 128 bits are random and the rest are fixed version and variant markers. Generate one at a time or up to fifty at once. Can two version 4 UUIDs ever collide?+ In theory yes, because they are random rather than coordinated, but in practice the odds are astronomically small. You would need to generate billions of UUIDs before a collision became remotely likely, so for real applications they are treated as unique. What is the difference between UUID v4 and v7?+ Version 4 is fully random, so values land all over the place. Version 7 embeds a timestamp, so IDs sort roughly in creation order, which is friendlier to database indexes. This tool generates v4, which is the right default unless you specifically want time-ordered keys. Are these UUIDs generated privately?+ Yes. They are created by your browser's random source, not on a server, so the values are yours alone and nothing is transmitted. You just copied that. What if you never lost it? **Relic** remembers everything you copy, forever, searchable on every device, and end-to-end encrypted so only you can read it. 250 MB free [Download forWindows](https://relic.space/download/windows)[Download formacOS](https://relic.space/download/macos)[Download forLinux](https://relic.space/download/linux)[Download forAndroid](https://play.google.com/store/apps/details?id=relic.space.app&referrer=utm%5Fsource%3Drelic.space%26utm%5Fmedium%3Dwebsite%26utm%5Fcampaign%3Dcontent)[Download foriPhone](https://apps.apple.com/us/app/relic-clipboard-vault/id6800556025) More free tools [JSON Formatterjson formatter](https://relic.space/tools/json-formatter)[Base64 Encode / Decodebase64 decode](https://relic.space/tools/base64)[Diff Checkerdiff checker](https://relic.space/tools/diff-checker)[URL Encode / Decodeurl decoder](https://relic.space/tools/url-encode-decode)[Epoch Converterepoch converter](https://relic.space/tools/epoch-converter)[Regex Testerregex tester](https://relic.space/tools/regex-tester)[All tools](https://relic.space/tools)