UUID Generator
100% PrivateDeveloper ToolsGenerate random version 4 UUIDs in bulk with your browser's cryptographic random source.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
- 1Choose how many UUIDs you need, from 1 to 100.
- 2Press Generate UUIDs.
- 3Copy one, or Copy all to take the whole list, one per line.
- 4Generate again whenever you need a fresh batch; values are never repeated or stored.
Every result follows the pattern xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the "4" marks the version and y is one of 8, 9, a or b. A real generated value has 122 random bits, so two generators producing a UUID at the same moment will, for all practical purposes, never collide.
- These are version 4 (random) UUIDs. If you need time-ordered identifiers, look at UUID v7 in a dedicated library instead.
- UUIDs are generated locally; batches of 100 are instant.
- The canonical form here is lowercase with hyphens, which is what most databases and APIs expect.
Version 4 UUIDs carry 122 random bits. The chance of an accidental duplicate is so small that the whole industry treats them as unique; you would need to generate billions per second for years to expect one collision.
About this tool
The UUID Generator creates version 4 (random) UUIDs with your browser's cryptographic random source. UUIDs are the standard way to give database rows, files, sessions and API resources an identifier that is practically guaranteed unique without asking a central server for permission.
Related tools
Part of Ovatly's free tools in Developer Tools.