UUID Generator

This UUID Generator creates random version 4 (v4) UUIDs directly in your browser using the built-in Crypto API for randomness. Choose how many you want from a dropdown (1, 5, 10, 25, or 50), click Generate UUIDs, and copy any single value or grab them all at once. Every UUID is generated locally, so nothing you produce is sent to a server.

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Why use UUID Generator?

The UUID Generator produces version 4 UUIDs, the fully random variant of the format. Under the hood it fills the standard xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx template, drawing each hex digit from the browser's crypto.getRandomValues call. The 4 in the third group marks the version, and the y position is constrained to 8, 9, a, or b to set the correct variant bits. The result is a canonical 36-character string that matches what languages and databases expect from a v4 UUID. The interface is deliberately small. A single dropdown labeled "How many UUIDs?" lets you choose 1, 5, 10, 25, or 50, and the Generate UUIDs button builds that many at once. Each result is shown in a monospace row with its own Copy button, and a Copy All UUIDs button gathers the full batch into one newline-separated block on your clipboard. There is no text input, no file upload, and no configuration beyond the count, which keeps the flow to a couple of clicks. Because generation happens locally with the Crypto API, the values you create are never transmitted anywhere; this is a legitimate identifier tool used for database keys, test data, and request tracing, and the data handling is simply that nothing leaves your browser. That local, cryptographically strong randomness is what makes v4 UUIDs safe to mint on any client without a central authority, since 122 random bits make accidental duplicates effectively impossible in practice.

Key benefits

Uses crypto.getRandomValues from the browser's Crypto API rather than Math.random, so the randomness is cryptographically strong.
Produces standards-shaped version 4 UUIDs with the correct 4 in the version position and the 8, 9, a, or b variant nibble.
Generates up to 50 at once and lets you copy them as a single newline-separated block.
Runs entirely client-side, so the values you generate never leave your device.

Features

Version 4 (random) UUID output in the canonical 8-4-4-4-12 hyphenated hex format
Batch dropdown with fixed choices of 1, 5, 10, 25, and 50 UUIDs
Per-UUID Copy button plus a Copy All UUIDs button that joins values with line breaks
Randomness sourced from the browser Crypto API (crypto.getRandomValues)
Fully client-side generation with no input box, upload, or server request

Popular use cases

Creating unique primary keys or record identifiers for a database without a central sequence.
Seeding test data or fixtures with a batch of 25 or 50 distinct IDs in one click.
Generating correlation or request IDs for logging, tracing, and API calls.
Producing stable keys for config files, feature flags, or message payloads during development.

How to use UUID Generator

1
Choose how many UUIDs
Open the "How many UUIDs?" dropdown and pick 1, 5, 10, 25, or 50. It defaults to 5.
2
Generate
Click the Generate UUIDs button. The tool builds that many random version 4 UUIDs instantly using the browser's Crypto API.
3
Copy what you need
Each UUID appears on its own row with a Copy button; click it to copy that single value (a checkmark confirms).
4
Copy the whole batch
Click Copy All UUIDs to place every generated value on the clipboard, one per line, ready to paste into code, a config file, or a database.

Frequently asked questions

Which UUID version does this generate?

Version 4 only. Every value is random, formatted as 8-4-4-4-12 hexadecimal with a fixed 4 in the version position and a variant nibble of 8, 9, a, or b. It does not produce v1 (time-based) or v5 (name-based) UUIDs.

How many UUIDs can I make at once?

The dropdown offers 1, 5, 10, 25, or 50 per click. There is no free-text field for arbitrary counts; you pick from those preset amounts and click Generate UUIDs.

Are these UUIDs random enough to be unique?

The tool draws randomness from the browser's crypto.getRandomValues (the Crypto API), which is a cryptographically strong source. A v4 UUID has 122 random bits, so collisions are practically nonexistent for normal use.

Is anything I generate sent to a server?

No. Generation runs entirely in your browser and copying uses your device clipboard, so the UUIDs are never uploaded; this is a legitimate identifier tool and there is no server round-trip and no logging of the values.

How do I copy all the values together?

Click Copy All UUIDs after generating. It puts every UUID on your clipboard as a newline-separated list, so you can paste the whole batch at once. Each row also has its own Copy button for a single value.

Can I use these as database keys or API identifiers?

Yes. Version 4 UUIDs are a common choice for database primary keys, record IDs, correlation IDs, and idempotency keys precisely because any client can mint one independently without coordination.

Last reviewed: July 2026

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