Bulk UUID Generator
Generate multiple UUIDs at once. Get 10, 50, 100, or any number of UUID v4 values in one click — copy all, download as a list, or use directly in your code.
Generate UUIDs in Bulk
Need a batch of UUIDs for test data, database seeding, or populating a fixture file? Generate any quantity of cryptographically random UUID v4 values instantly in your browser.
- Any quantity: Generate 1 to 1,000+ UUIDs in a single click
- Copy all: One-click copy of the entire list to clipboard
- Format options: Plain list, comma-separated, JSON array, or SQL VALUES
- Cryptographically random: Generated using
crypto.getRandomValues()— not Math.random()
Common Uses for Bulk UUID Generation
- Database seeding: Populate test tables with realistic UUID primary keys before running integration tests
- Fixture files: Pre-generate IDs for JSON or YAML test fixtures so object relationships stay consistent across test runs
- API mocking: Seed a mock API response file with stable UUIDs for UI development before the backend is ready
- Migration scripts: Generate a batch of new UUIDs when migrating from sequential integer IDs to UUIDs in an existing table
- Load testing: Create a large set of unique identifiers for load test payloads without hitting a real ID-generation service
UUID Formats for Different Contexts
- Plain list: One UUID per line — paste directly into a text file or spreadsheet
- JSON array:
["uuid1", "uuid2", ...]— ready for JavaScript, Python, or any JSON consumer - SQL INSERT:
('uuid1'), ('uuid2'), ...— paste into a VALUES clause for bulk database inserts - Without hyphens: Some systems store UUIDs as 32-character hex strings without dashes — the generator supports both formats
Frequently Asked Questions
Are bulk-generated UUIDs still unique?
Yes. Each UUID v4 in a bulk batch is independently generated using crypto.getRandomValues(), which draws from the OS entropy pool. The probability of two UUIDs in a batch matching is the same as any two independently generated UUIDs — effectively zero at any realistic batch size. The generator also checks for duplicates within the batch and regenerates any that match (an event that essentially never occurs).
How many UUIDs can I generate at once?
The generator can produce thousands of UUIDs in a single batch without performance issues — UUID generation is extremely fast in modern browsers. For very large batches (100,000+), generation takes a second or two. Practical limits are clipboard size and whether your target system can consume the output efficiently.
Should I generate UUIDs client-side or server-side in production?
For production systems, generate UUIDs server-side or in your application code — not from a web tool. Use uuid (Node.js), uuid.uuid4() (Python), java.util.UUID.randomUUID() (Java), or Str::uuid() (Laravel). The bulk generator is for development, testing, and one-off data needs — not for generating production IDs that need to be programmatically created at runtime.