UUID Generator — Create Unique IDs in the Browser
Unique identifiers are needed everywhere: primary keys for database records, correlation IDs for distributed systems, and temporary tokens for APIs. UUID v4 (random) is a standard format that doesn't require a central authority: you can generate as many as you need and collisions are astronomically unlikely. Generating them in the browser with a simple tool means no server round-trip and no dependency on an external API. This generator uses the Web Crypto API when available (crypto.randomUUID) so the values are suitable for production use, with a fallback for older environments. You can generate one UUID or several at once, copy them, and paste directly into your app, config, or test data. UUIDs are not secret; they are meant to be unique, not unpredictable in a security sense. For security-sensitive tokens, use a proper token mechanism. For IDs in databases, logs, and APIs, UUID v4 is widely supported and easy to use.
What Does This Tool Do?
This tool generates UUID v4 (random) identifiers. You choose how many to generate (from 1 to 20) using the count input, then click Generate. Each UUID is a 36-character string in the standard form: 8-4-4-4-12 hex digits with hyphens (e.g. 550e8400-e29b-41d4-a716-446655440000). They appear one per line in the output area. When the browser supports it, the tool uses crypto.randomUUID() for cryptographically strong random values; otherwise it uses a fallback so the tool still works. All generation happens in your browser; no data is sent to a server. You can copy all generated UUIDs to the clipboard or clear the output and generate again. The count is clamped between 1 and 20 so you don't accidentally generate huge lists. Each UUID is independent; generating 10 at once gives you 10 different values. The format is compatible with PostgreSQL uuid, MySQL, and most languages' UUID libraries.
How to Use It (Step-by-step)
Set the Count (1–20) for how many UUIDs you need.
Click Generate. The output area fills with that many UUIDs, one per line.
Use Copy to copy all of them to the clipboard. You can then paste into your code, config, or a spreadsheet.
Use Clear to empty the output if you want to generate a fresh set.
Change the count and generate again anytime. There's no submit or server call; each click generates locally. For production use, ensure your environment provides crypto.randomUUID() or a strong random source; the fallback is fine for dev and test but may not meet security requirements for tokens.
Key Features & Use Cases
- Client-side only: no data is sent to a server.
- UUID v4 (random) format, 36 characters with hyphens.
- Generate 1 to 20 UUIDs in one click.
- Uses crypto.randomUUID() when available for strong randomness.
- Copy all generated UUIDs to the clipboard.
- Generate primary keys for new database records or test data.
- Create correlation IDs for distributed tracing and logging.
- Produce unique identifiers for API request or event IDs.
- Temporary session or upload IDs in web applications.
- Test data and fixtures that require unique IDs.