Bulk UUID Generator
Generate up to 10,000 UUIDs at once in multiple formats. Choose your version, output format, and separator - then copy or download the results.
When Do You Need Bulk UUIDs?
There are many developer scenarios where a batch of pre-generated UUIDs is more convenient than generating IDs at runtime. Bulk generation is entirely safe because UUID v4 uses cryptographically random bits and UUID v7 adds a millisecond timestamp - neither version requires coordination between generators, so pre-generating thousands at once is statistically equivalent to generating them one at a time on demand.
Common Use Cases
Database Seeding & Migrations
When writing SQL migration scripts that INSERT reference data, you need UUIDs for primary keys ahead of time. Generate the required number of UUIDs, paste them directly into your SQL INSERT statements, and commit the migration with stable, reproducible IDs.
Test Data Generation
Unit and integration tests often require fixture data with pre-known UUIDs so assertions can reference specific records. Bulk-generate a set of UUIDs, hard-code them in your test fixtures or factory definitions, and reuse them across test runs for deterministic behaviour.
API Testing with Postman / Insomnia
Load test collections that need unique IDs per request. Generate a list of UUIDs, import them as a CSV data file in Postman's collection runner or Insomnia's environment, and each request iteration will use a fresh UUID without runtime generation logic.
Infrastructure & Configuration
Terraform, Kubernetes manifests, and Helm charts sometimes require stable UUIDs for resource names, labels, or configuration values that must be consistent across deployments. Generate them once, check them into version control, and reference them everywhere.
Output Format Guide
Hyphenated
550e8400-e29b-41d4-a716-446655440000
The canonical RFC 4122 form. Use this for most databases, REST APIs, and log files where human readability matters.
No Hyphens
550e8400e29b41d4a716446655440000
32-character hex string. Used by MySQL when storing UUIDs in CHAR(32) columns or when embedding in URLs without percent-encoding the hyphens.
URN
urn:uuid:550e8400-...
Uniform Resource Name form per RFC 4122 Section 3. Required in XML namespaces, LDAP, and some SOAP/WS-* protocols that need a globally resolvable identifier format.
Performance & Limits
This generator produces up to 10,000 UUIDs per batch entirely in your browser using the Web Crypto API. On modern hardware, generating 10,000 UUID v4 values takes approximately 5-50 milliseconds depending on the browser and device.
For larger batches (100,000+), consider using server-side generation. Node.js: crypto.randomUUID() in a loop. Python: import uuid; [str(uuid.uuid4()) for _ in range(n)]. Go: use github.com/google/uuid which generates ~20M UUIDs/sec on a single core.