UUID Bulk Generator – Generate UUID Online (Free Tool)
Free online UUID Bulk Generator tool to generate multiple UUIDs at once in bulk. Create hundreds or thousands of unique identifiers instantly for database seeding, testing, and batch processing. All generation happens locally using Web Crypto API.
Example Output
Bulk UUID list with optional sequential index, downloadable as TXT, CSV, or JSON for seeding databases or fixtures.
uuids.csv — 10,000 rows with index + uuid columns
What is UUID Bulk Generator?
Bulk-generate thousands or millions of UUIDs in one go — perfect for seeding databases, creating test fixtures, or pre-generating IDs for offline systems. v4 (random), v1 (timestamp), and v7 (time-sortable monotonic) supported. All generation happens locally with the browser's CSPRNG.
Why use this tool?
- 100% free with no hidden costs or daily limits
- Works offline after the first page load
- Lightweight page weight that loads quickly even on slow connections
- Built for developer workflows: copy-friendly output, syntax-aware highlighting where useful
- Works with very large inputs (multi-megabyte JSON, long regex patterns, big tables)
How to use
- Set bulk count (1 - 100,000+)
- Pick version (v4 random / v1 / v7 time-sortable)
- Click Generate — download as TXT/CSV/JSON
- Optional: include sequential index column
Examples
Database seed file
Generate 100,000 v4 UUIDs as CSV and `LOAD DATA INFILE` them into a MySQL table for performance testing.
v7 sortable IDs
For a time-series table, v7 UUIDs sort by creation time naturally — better index locality than v4.
JSON test fixtures
Generate 1,000 UUIDs as a JSON array to drop straight into a Jest test file.
Common use cases
- Pre-generating IDs for offline / disconnected systems
- Bulk database seeding (>10K rows)
- Load-test fixture generation
- v7 monotonic IDs for time-series tables
- Reserving ID blocks for distributed services
Troubleshooting
- Browser tab freezes generating millions
- Generation runs in a Web Worker — but if you typed an unrealistic count (e.g. 100 million) memory will exhaust. Generate in chunks of 1 million.
- v7 UUIDs don't look sequential
- They're lexicographically sortable, not visually sequential — only the first 48 bits are time-based. Sort the list to see the order.
- CSV download has Windows line endings on Mac
- Toggle "Unix line endings (LF)" in advanced — default CRLF for Excel compatibility, LF for Unix tools.
Frequently Asked Questions
Bulk generation is useful when you need many unique identifiers at once, such as for database seeding, testing, or batch processing operations.
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