Free online tool
Free Online UUID Generator
Generate v4 (random) and v7 (timestamp-ordered) UUIDs online. Batch mode generates up to 1000 at once. v4 uses native crypto.randomUUID — zero library bytes. 100% client-side — nothing is ever sent to a server.
01How it works
Choose version and count
Select v4 (random) or v7 (timestamp-ordered) and set the batch size from 1 to 1000.
Click Generate
UUIDs are generated instantly in your browser using cryptographically secure randomness.
Copy or download
Copy all UUIDs to clipboard at once or download them as a plain text file, one UUID per line.
FAQ
Frequently asked questions
What is the difference between UUID v4 and v7?
UUID v4 is randomly generated with 122 bits of randomness from a cryptographically secure random number generator. UUID v7 encodes a 48-bit Unix timestamp (millisecond precision) in the most-significant bits, making v7 UUIDs naturally sortable by creation time. Use v4 for opaque IDs where order does not matter; use v7 as database primary keys where you want index locality.
Why is the batch limit 1000?
The batch limit is 1000 UUIDs. This is a practical UI limit — generating more at once produces a textarea too large to scroll comfortably. If you need more, generate in multiple batches or use the UUID library directly in your application code.
Are v7 UUIDs strictly ordered when generated in rapid succession?
v7 UUIDs generated in the same millisecond share the same timestamp prefix. Within that millisecond, ordering depends on the random bits in the lower portion of the UUID, so same-millisecond UUIDs are not strictly ordered relative to each other. For most use cases (database inserts at human interaction speed) this is not a concern.
Does v4 generation require loading any library?
v4 UUIDs use the browser's native crypto.randomUUID() — no library is loaded at all. v7 UUIDs use the uuid npm library's v7 function, which is lazy-loaded (~10 KB) the first time you switch to v7 mode. Both paths use the browser's cryptographically secure random number generator.
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