An ID is a label used to tell one thing from another. A UUID is a long label that different programs can create without asking one central server for the next number. UUID Generator makes random version 4 UUIDs in your browser.
Make a few IDs
Open the tool. How many starts at 5, so you should already see five lines. Each line is one UUID. It looks roughly like xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the x and y positions vary. Do not expect the exact same result twice: the tool makes new random values.
Set How many to 2 and choose Generate. You should now see two lines. If you turn on Uppercase, the letters become capital letters; Wrap in braces puts { and } around each ID. These options change how the IDs are written, so check the format the receiving program expects. Use Copy when you need the list.
What these IDs do not prove
A UUID helps avoid accidental duplicates; it does not prove who created a record or make a URL secret. Never use a visible ID alone as an access check. If you need one ID for a test record, generate one and keep a note of where you used it rather than guessing you can recreate the same value later.
Where your input goes
Processing runs in your browser. The tool does not upload your input to ilham.dev.
Related guide
For more background, read IDs and Test Data.
Questions you might have
- Can two generated UUIDs collide?
- A v4 UUID carries 122 random bits. You would need to generate around 2.7×10^18 of them before a collision became likely, which is far beyond any realistic workload.
- Are these UUIDs predictable?
- No. They come from crypto.getRandomValues rather than Math.random, so earlier values tell you nothing about later ones.