Free bulk UUID generator: create up to 10,000 v4 UUIDs in one click with hyphen/uppercase/JSON formatting. Copy or download instantly — generated locally, never uploaded.
TL;DR: Free bulk UUID generator: up to 10,000 v4 UUIDs per click with hyphen, uppercase, and JSON-quote formatting. Local generation, instant copy or download.
This tool runs entirely in your browser. Open DevTools → Network panel and search your input — it appears in no request.
Next steps
Usage Guide
Seeding test data, initializing databases, minting order references — one UUID is rarely enough. Generate up to 10,000 v4 UUIDs per click with configurable formatting (hyphens, uppercase, JSON quotes), then copy or download in one action. Powered by crypto.getRandomValues, fully local.
1. How to use
- Enter the count (1-10,000, with 10/100/1000/10000 shortcuts).
- Configure formatting for the destination: SQL seeds often drop hyphens, JSON arrays want quotes, log comparisons prefer uppercase.
- Generate, then copy or download uuids.txt.
2. Which format for which destination
- Hyphenated (default): human-readable — documents, URL trace IDs.
- No hyphens: length-sensitive keys such as database primary keys or Redis names (32 chars).
- JSON quotes: paste straight into fixtures and config files without hand-quoting.
3. Uniqueness, in honest numbers
A v4 UUID carries 122 random bits. Collision probability follows the birthday bound: about 50% only after ~1 billion IDs; at 10,000 IDs it is on the order of 10^-20 — orders of magnitude below winning two lotteries in a row. Engineering conclusion: trust v4 for test data, seeds, and everyday primary keys; when a global strong-uniqueness audit matters (financial reconciliation), enforce uniqueness with database constraints rather than relying on generator-side probability.
FAQ
Completely free, no signup. All UUIDs are generated locally with crypto.getRandomValues — the same randomness quality as the OS-level source.
10,000 per click. Generating that many takes tens of milliseconds, and the output can be copied or downloaded as a txt file in one action.
A v4 UUID has 122 bits of randomness; the birthday-bound collision probability reaches ~50% only after ~1 billion IDs are generated. For everyday batches (test data, database seeds) the risk is negligible.
This page focuses on batches: count, formatting (hyphens, uppercase, JSON quotes), copy, and download. The single generator additionally parses version, variant, and timestamp — better for inspecting one ID.
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