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.
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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. Generation stays 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).
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.
4. How this splits work with the single UUID generator
This page focuses on batches: count, formatting, copy, and download. The single generator also explains version, variant, and timestamp-related details — better when you stare at one ID and ask "is this v4 or v1?". Mint in bulk here, then parse one sample on the single-ID page for teaching and debugging.
5. Checks before writing to a database
- Use an explicit UUID / CHAR(36) / BINARY(16) column type so values are not truncated as short strings.
- If you store without hyphens, confirm readers re-insert hyphens the same way — mismatched conventions are a classic integration bug.
- For large inserts use COPY/bulk insert, not row-by-row INSERT; the txt download exists to feed scripts.
6. What this is not
This page only mints RFC 4122 v4 (random). For sortable ULID/KSUID or name-based v5, use the matching tool or library — do not treat "bulk v4" as "every ID scheme". And do not treat UUIDs as security secrets: they are far less predictable than weak PRNGs, but they are not session-token entropy with lifecycle management.
7. Generate and export checks
Cap is 10,000 with 10/100/1000/10000 shortcuts. Combine hyphens, uppercase, and JSON quotes as needed. Spot-check length (36 with hyphens, 32 without) and hex charset. Download uuids.txt for scripts; for sortable IDs use the single-UUID page (v7/ULID) — this page emits RFC 4122 v4 only.
FAQ
Locally in your browser via crypto.getRandomValues — the same randomness quality as the OS-level source — with nothing uploaded along the way.
Up to 10,000, with quick presets of 10/100/1,000/10,000. A full 10,000 batch takes tens of milliseconds and can be copied or downloaded as a txt file in one action.
Follow the downstream consumer: hyphenated (default) is human-readable and fits docs and URL trace IDs; the 32-character no-hyphen form suits length-sensitive keys such as database primaries and Redis key names; JSON quoting pastes straight into test fixtures and config files.
A v4 UUID has 122 random bits — the collision probability nears 50% only after about a billion IDs, and a 10,000 batch sits around 10^-20, negligible for everyday seeding. For strong-uniqueness audits like financial reconciliation, back it with a database constraint instead of betting on generator odds.
This page produces RFC 4122 v4 (random) only. For sortable, roughly time-ordered IDs look at ULID/KSUID (the single generator also offers v7); for "same name, same ID forever" use a v5 namespace scheme; to inspect one ID's version and variant, use the single UUID generator — batch here, parse there is a common debugging flow.
Use explicit column types like UUID, CHAR(36), or BINARY(16) so values are not truncated as short strings; agree with readers whether hyphens get re-inserted when storing without them; use COPY/bulk insert rather than row-by-row INSERTs; and add a unique constraint as the final gate before going live.
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