How to Use
- Choose a version: v7 (time-sorted) or v4 (random).
- Set the amount (1–10,000) and enable bulk mode if needed.
- Pick an output format: hyphens, uppercase, braces/quotes, SQL, or JSON.
- Click Generate, then copy all or download as .txt/.json.
Core Features
- UUID v7 (Timestamp-based): Generate time-sorted v7 IDs to improve index locality for databases.
- Bulk Generation (10k+): Generate up to 10,000 IDs fast with chunked output to avoid UI freezes.
- Custom Format (SQL/JSON): Export as SQL INSERT snippets, JSON arrays, quoted/braced forms, or plain text.
- Collision-Free Algorithm: Combine timestamp ordering with strong randomness to minimize collision risk.
- Process locally: Run entirely in-browser so sensitive identifiers never leave your device.
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Calculation Logic
- v4: Use cryptographically secure randomness (Web Crypto) and set the UUID version/variant bits.
- v7: Follow RFC 9562 layout with a millisecond Unix timestamp plus random entropy; apply a same-millisecond sequence strategy to reduce duplicates.
- Bulk mode: Stream results in chunks to keep rendering responsive.
FAQ
Why should I use UUID v7 over v4 in databases?
UUID v7 is time-sorted, so inserts are closer to sequential in B-tree indexes, reducing fragmentation compared to fully random v4.
How to generate 10,000 UUIDs instantly?
Use Bulk Mode and set the slider to 10,000. We generate in chunks so your browser stays responsive.
Is my data safe (local/privacy)?
Yes. Generation runs 100% in your browser. Nothing is uploaded, stored, or logged on a server.
Is it free? Any limits?
It’s free. You can generate 1–10,000 UUIDs per run and export anytime; split into batches for larger needs.
Are UUIDs guaranteed unique?
No system can guarantee absolute uniqueness, but the entropy and structure of v4/v7 make collisions astronomically unlikely in practice.