UUID Generator
Generate one or many random UUID v4 values.
Every UUID is generated locally in your browser using the crypto API, and nothing you produce is uploaded to a server.
Need realistic sample records too? Try the Mock Data Generator.
About UUID Generator
This uuid generator creates random version-4 UUIDs (also called GUIDs) using your browser's built-in crypto API, so every value is cryptographically random. As a uuid v4 generator it produces a single identifier or up to 1000 at once, which makes it handy for seeding databases, generating primary keys, naming test fixtures, or creating correlation IDs for logs and APIs. Flip the uppercase toggle if your schema expects capitalized GUIDs, then copy all values in one click or download them as a .txt file. It is built for developers, QA engineers, and anyone who needs to generate uuid online quickly without leaving their workflow. Everything runs locally in your browser, so the random uuid values you produce never travel to a server and nothing is uploaded.
Features
- Generates cryptographically random version-4 UUIDs via the browser crypto API
- Creates a single UUID or up to 1000 in a single batch
- Uppercase toggle for capitalized GUID formatting
- Copy all generated UUIDs to the clipboard in one click
- Download the full list as a .txt file
- Regenerate a fresh set instantly with the Generate button
- Shows a live count of how many UUIDs were produced
- Runs entirely in your browser with no values uploaded
How to use the UUID Generator
- Enter how many UUIDs you need in the How many box (1 to 1000).
- Toggle Uppercase on if you want capitalized GUIDs.
- Click Generate to produce a fresh batch of v4 UUIDs.
- Use Copy all to copy them, or click .txt to download the list.
Example
Input
How many: 3, Uppercase: off
Output
3f29c1a4-7b8e-4d2f-9c1a-6e5b2d8f0a13
b6d4e90c-12af-4e77-8a3b-9f0c1d2e3a4b
7c1e5a2d-4f6b-4c80-91ad-2e3f4b5c6d7e
Three random v4 UUIDs generated locally in the browser.
Common errors & troubleshooting
- You expected sequential or ordered UUIDs but got scattered values. — Version-4 UUIDs are random by design and carry no ordering; use a timestamp or v7-style scheme if you need sortable IDs.
- A count above 1000 does not produce more results. — The generator caps each batch at 1000; click Generate again to create additional batches.
- Your database rejects uppercase GUIDs or vice versa. — Match your schema by toggling Uppercase before generating so the casing fits what your column expects.
- A typed count below 1 or a blank box snaps back to a value. — The How many field is clamped to 1 to 1000, so enter a whole number inside that range to control the batch size.
Frequently asked questions
- What is the ArrayKit UUID Generator?
- It is a uuid generator that produces random version-4 UUIDs using your browser's crypto API, the most common general-purpose UUID format for keys and IDs.
- Are the UUIDs from this generator actually unique?
- They are cryptographically random v4 UUIDs, so the chance of a collision is astronomically small and safe for practical use.
- How do I generate many UUIDs at once with the UUID Generator?
- Set the How many box to any number from 1 to 1000, click Generate, then use Copy all or the .txt button to export the whole batch together.
- Can the UUID Generator output uppercase GUIDs?
- Yes, turn on the Uppercase toggle and the generator will output capitalized UUID values for schemas that expect them.
- What is the difference between a UUID and a GUID here?
- They are the same thing; GUID is Microsoft's name for a UUID, and this tool emits standard version-4 values that work in both contexts.
- Is it safe to generate UUIDs for sensitive systems in the UUID Generator?
- Yes, every UUID is generated locally in your browser and nothing is uploaded, so the values never leave your device.
Related tools
All ArrayKit tools