voiddo uuid vs uuidgenerator.net
Both generate UUIDs online. This page compares UUID version support, bulk limits, privacy, and when each tool fits your workflow.
voiddo uuid — use when
- You need UUID v7 — time-ordered, RFC 9562, database-friendly
- You need bulk generation up to 100 UUIDs at once
- You want zero server calls — crypto.randomUUID() in-browser only
- You need nil or max sentinel UUIDs for test fixtures
- You want uppercase / lowercase toggle in one click
- You want no ads, no paywalls, no signup
uuidgenerator.net — use when
- You only need a quick v4 or v1 UUID with a familiar UI
- You want a long-indexed, widely shared bookmark URL
- You need a GUID with braces formatting option for Windows/.NET
- Input is non-sensitive and server-side generation is acceptable
feature comparison
| feature | voiddo uuid | uuidgenerator.net |
|---|---|---|
| UUID v4 (random) | ✓ browser-only | ✓ |
| UUID v7 (time-ordered, RFC 9562) | ✓ browser-only | not supported |
| UUID v1 (timestamp + node) | ✓ browser-only | ✓ |
| nil UUID | ✓ | – |
| max UUID | ✓ | – |
| all versions on one page | ✓ tab switcher | separate pages per version |
| bulk generation limit | up to 100 at once | 5 (free), more behind limit |
| data sent to server | never — browser CSPRNG only | server-side generation |
| uppercase / lowercase toggle | ✓ | lowercase only |
| copy output button | ✓ single + copy all | ✓ |
| GUID with braces format | not currently | ✓ {GUID} option |
| ads | none | ads present |
| price | free | free (bulk limit applies) |
| account required | no | no |
frequently asked questions
Is voiddo uuid an alternative to uuidgenerator.net?
Yes. voiddo uuid is a free browser-only UUID generator supporting v4, v7, v1, nil, and max formats. It runs entirely in your browser — nothing generated is transmitted to any server. It is a privacy-first alternative to uuidgenerator.net with additional UUID v7 support and bulk generation up to 100 UUIDs at once.
Does voiddo uuid send data to a server?
No. Generation uses
crypto.randomUUID() (v4) and crypto.getRandomValues() (v7, v1) — both are browser-native APIs. No network request is made after the page loads. The output UUIDs are indistinguishable in quality from those produced by the uuid npm package or Python's uuid.uuid4().What is UUID v7 and why does it matter for databases?
UUID v7 (RFC 9562, April 2024) places a millisecond Unix timestamp in the first 48 bits, so UUIDs generated later sort after earlier ones. This matters for B-tree database indexes: purely random v4 UUIDs cause random page splits on insert, degrading performance at scale. v7 inserts always land near the end of the index, like an auto-increment integer but globally unique. If you are starting a new project with a Postgres or MySQL primary key, v7 is usually the better default over v4. voiddo uuid generates v7 entirely in the browser; uuidgenerator.net does not currently offer v7.
How many UUIDs can I bulk generate?
voiddo uuid supports 1 to 100 UUIDs per bulk request, output into a single copyable textarea. uuidgenerator.net's free bulk mode generates up to 5 at a time. For test fixture generation, seeding a database, or filling a spreadsheet, voiddo uuid avoids repeated page interactions.
Are the generated UUIDs cryptographically secure?
Yes. v4 uses
crypto.randomUUID() — the same CSPRNG the browser uses for TLS session keys. v7 uses crypto.getRandomValues() for its 74 random bits. Neither version can be predicted from previous outputs. The collision probability for v4 is negligible: generating 1 billion UUIDs per second for 85 years yields roughly a 50% chance of a single collision.Is voiddo uuid free?
Yes — completely free with no ads, no signup, no rate limits, and no bulk paywalls. It is part of the 49+ free developer tools at tools.voiddo.com.
Try voiddo uuid — browser-only, UUID v7, bulk up to 100, no ads:
open uuid generator →Feature descriptions based on publicly observable behaviour as of May 2026. Features may change; verify on each tool's own page before making a production decision.