Seeding Database Migration & Fixture Rows
Generate batches of collision-free primary keys for PostgreSQL `uuid` columns, SQL seed scripts, and JSON test fixtures.
UUID Generator
Generate globally unique 128-bit identifiers (UUID v4 / GUID) in your browser using native cryptographic randomness. Generate a single ID or a batch of up to 50 UUIDs at once, toggle standard 8-4-4-4-12 hyphenation or compact 32-character hex mode, switch between lowercase and uppercase, and copy the entire list in one click.
How to Use the UUID Generator
- 1
Enter how many UUIDs you need in the batch (from 1 up to 50 identifiers).
- 2
Toggle 'Include hyphens' (standard 36-character `8-4-4-4-12` format vs compact 32-character hex) and 'Uppercase' if required by your database or API.
- 3
Click Generate to produce a fresh batch of RFC 4122 Version 4 UUIDs.
- 4
Click Copy All to copy the entire newline-separated list, or copy individual UUIDs.
Practical Use Cases
Idempotency Keys & Correlation Request IDs
Create unique `X-Request-ID` or `Idempotency-Key` values when testing payment webhooks and distributed microservices in Postman or cURL.
Generating App Bundle, Bluetooth BLE & COM GUIDs
Produce uppercase or hyphenated GUIDs required for Bluetooth GATT service UUIDs, Windows registry installers, and Xcode project targets.
UUID Generator Features
Bulk Generation (1 to 50 UUIDs)
Create a single identifier or a 50-line batch for database seeding in one click.
Hyphen & Case Formatting Toggles
Switch instantly between standard `36-char` hyphenated and `32-char` compact hex, in lowercase or UPPERCASE.
RFC 4122 Version 4 Compliant
Sets the mandatory version (`4`) and variant (`10xx`) bits using Web Crypto entropy.
Runs 100% in your browser
Nothing is uploaded to a remote server, so your data and files stay strictly on your device.
Free and unlimited
No account registration, no watermarks, and no daily usage caps.
Mobile and desktop ready
Responsive layouts and comfortable touch controls that fit phones, tablets, and desktops.
Technical Specifications & Best Practices
- ✓Generates compliant RFC 4122 / RFC 9562 Version 4 UUIDs: the 13th hex digit is always `4` (indicating v4) and the 17th hex digit is `8`, `9`, `a`, or `b` (indicating the standard RFC variant).
- ✓Contains 122 bits of cryptographic entropy from `crypto.randomUUID()` / `crypto.getRandomValues()`, yielding `5.3 × 10³⁶` possible combinations.
- ✓Toggle off hyphens when a compact 32-character hexadecimal string is needed for filenames or object storage keys.
- ✓100% local in-browser generation — your generated identifiers are never logged or shared.