Free UUID Generator — v4 and v7 in Bulk

Generate v4 and v7 UUIDs in bulk, right in your browser. Up to 1,000 IDs per click, each with its own copy button — free, private, no signup.

UUID version

How many? (1–1,000)

Format

Include dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)

Generated UUIDs

100% private

UUIDs are created in your browser with the Web Crypto API (crypto.getRandomValues). Nothing is uploaded, logged, or sent to any server.

No signup

No account, no email, no API keys. Open the page and generate as many UUIDs as you need.

Free forever

Bulk generation, v7 time-ordered IDs, case and dash formatting — all free with no limits or watermarks.

How to use the UUID generator

1
Choose a version
Pick v4 for random IDs (crypto.randomUUID under the hood) or v7 for time-ordered IDs built to the RFC 9562 layout.
2
Set count and format
Generate 1 to 1,000 UUIDs at once, then pick lowercase or uppercase and keep or drop the dashes.
3
Copy your IDs
Use the small Copy button on any single UUID, or hit Copy All to grab the whole batch for your code or database.

Why use this UUID generator

v4 and v7 support

v7 UUIDs are built manually per RFC 9562 — 48-bit Unix timestamp in milliseconds plus cryptographically random bits — so newer IDs sort after older ones.

Bulk generation up to 1,000

Seed a database table, fill test fixtures, or stock an API with up to a thousand unique IDs in a single click.

Copy per UUID or copy all

Every generated ID has its own copy button, and Copy All grabs the full batch as a newline-separated list.

Case and dash formatting

Switch between lowercase and uppercase, or strip the dashes for the 32-character compact form some systems require.

Cryptographically random

v4 IDs use the Web Crypto API (not Math.random), giving you real entropy suitable for database keys and session IDs.

Time-ordered v7 IDs

v7 embeds the current timestamp, so IDs generated later sort after earlier ones — ideal for database primary keys and event logs.

UUID generator FAQs

What is the difference between UUID v4 and v7?

v4 UUIDs are fully random — every bit comes from a random number generator. v7 UUIDs start with a 48-bit Unix timestamp in milliseconds, so they are time-ordered: IDs created later always sort after earlier ones. v7 was added by RFC 9562 in 2024 and is the recommended choice for database primary keys.

Why are v7 UUIDs better for databases?

Random v4 IDs scatter writes across a B-tree index, which fragments it and slows inserts. Time-ordered v7 IDs arrive in ascending order, so new rows append naturally — inserts stay fast and indexes stay compact.

How are the v7 UUIDs generated here?

In JavaScript, per RFC 9562: the first 12 hex characters are the 48-bit Unix timestamp in milliseconds, followed by a “7” version nibble, 12 random bits, the 2-bit variant field set to “10”, and 62 random bits. All randomness comes from crypto.getRandomValues.

Are these UUIDs really unique?

v4 collisions are astronomically unlikely — with 122 random bits you would need to generate billions of IDs per second for a century before expecting a collision. v7 adds timestamp ordering on top of 74 random bits, which is equally safe for practical use.

What does the no-dashes option do?

It removes the four hyphens, producing the 32-character compact form (e.g. 550e8400e29b41d4a716446655440000) that some APIs, file formats, and legacy systems require.

Is there a limit on how many I can generate?

Each click generates 1 to 1,000 UUIDs. There is no daily cap or account limit — generate as many batches as you need, all free.

Do my generated UUIDs leave my device?

No. Every UUID is computed locally in your browser. Nothing is uploaded, stored, or tracked.