Generate 1,000 UUIDs in One Click
You’re seeding a dev database with 500 records. Each one needs a UUID primary key. You could write a script with a loop, or you could generate 500 UUIDs right here, copy the batch, and paste them into your seed file.
This tool creates up to 1,000 v4 UUIDs per batch using crypto.randomUUID(). Pick your format — standard lowercase with hyphens, no hyphens, uppercase, or Microsoft’s curly-brace GUID style. Copy individually or grab the whole batch at once.
Practical Batch Sizes
10-50 UUIDs: Database seeding for a small dev environment. Paste them into a seed SQL file or a JSON fixtures file.
100-500 UUIDs: Integration testing. Each test case gets its own UUID so tests don’t interfere with each other even when run in parallel.
1,000 UUIDs: Load testing mock data, large-scale seeding, or pre-generating identifiers for a batch import job.
Even 1,000 UUIDs generate in milliseconds. UUID v4 has 122 bits of randomness — 5.3 x 10^36 possible values. Collisions within a batch are so improbable that no deduplication check is needed.
Format Reference
Pick the format your system expects:
- Standard:
550e8400-e29b-41d4-a716-446655440000— most databases, most languages - No hyphens:
550e8400e29b41d4a716446655440000— more compact, some databases prefer this for BINARY(16) storage - Uppercase:
550E8400-E29B-41D4-A716-446655440000— Windows conventions, SQL Server - Braces:
{550e8400-e29b-41d4-a716-446655440000}— Microsoft COM GUIDs, some Windows APIs
When Bulk Generation Beats Code
Sometimes it’s faster to generate UUIDs here and paste them than to write even a simple script. You need 50 UUIDs in a SQL INSERT statement? Generate them, paste them in, and move on. You’re populating a test config file with unique identifiers? Grab a batch and fill it in.
For complete test datasets (UUIDs plus names, emails, and other fields), combine this with the Fake Data Generator. For custom-length random strings in non-UUID format, the Random String Generator offers more flexibility.
All generation runs in your browser using crypto.randomUUID(). Nothing leaves the page.