How to use the uuid generator
Version 4 UUIDs provide randomly generated identifiers for records, test fixtures, and distributed workflows. This generator uses crypto.randomUUID and permits one to one thousand identifiers per batch. Results use the standard lowercase hexadecimal representation with hyphens. Randomness makes collisions extremely unlikely but does not replace database uniqueness constraints or make an identifier an authorization credential.
Work directly in the input area at the top of this page and choose the settings that match your task. Run the action to see the output separately from your original input. Start with a small example whose result you can check, then process the value you actually need. Changing an input clears an older result so it cannot be mistaken for a fresh conversion.
Processing runs in your browser. This tool does not send your input to a conversion server, create an account history, or save the input in browser storage. A copied result remains subject to your device clipboard settings, while a downloaded file stays on your device until you remove it. Anyone with access to your screen or browser can still see the information you enter.
Use Copy for text output or Download for a local file. If clipboard access is unavailable, select the output and copy it manually. Clear removes the current result and any main text or file input; settings remain available for another run. Keep original files and important values until you have checked that the output works in the application where you intend to use it.
Frequently asked questions
Are these UUIDs safe to use as security tokens?
Version 4 UUIDs come from your browser's cryptographic random source, so they are unpredictable. They are still identifiers rather than secrets: they often appear in URLs and logs, so use a dedicated token for anything that grants access.
What is the chance of two UUIDs colliding?
A version 4 UUID has 122 random bits. You would need to generate billions per second for a lifetime before a collision became likely, which is why they can be created independently on many machines without coordination.
Should I use a UUID as a database primary key?
It removes the need for a central sequence and lets clients create records offline, but random UUIDs scatter inserts across the index and take 16 bytes instead of 4 or 8. For large write-heavy tables consider a time-ordered identifier such as UUIDv7 or ULID instead.