UUID / GUID Generator
Generate cryptographically secure RFC4122 version 4 UUIDs and GUIDs in bulk with custom casing, hyphens, and braces.
Overview
Generate cryptographically random UUID v4 (Universally Unique Identifiers) and GUIDs in bulk directly in your browser. Whether you are creating database primary keys, testing API endpoints, designing distributed systems, or generating test fixtures, this tool provides instant unique identifiers adhering to RFC 4122 specifications.
Customize your output with options for uppercase or lowercase lettering, standard hyphenation, or wrapped curly braces. Copy individual UUIDs with a single click or export your entire batch to a text file.
Key Features
- RFC 4122 v4 Standard — Generates true 128-bit random UUIDs using the browser's cryptographically secure Web Crypto API.
- Bulk Generation — Produce anywhere from 1 to 100 unique UUIDs simultaneously in a fraction of a second.
- Formatting Options — Toggle uppercase or lowercase formatting, with or without hyphens, and optional brace wrapping { ... }.
- Individual & Bulk Copy — Copy single IDs via dedicated icon buttons or copy the full list with one click.
- Direct Text Download — Export all generated identifiers as a clean .txt file for mock data pipelines and tests.
Tech Stack
Built with HTML5, CSS, and JavaScript. Uses crypto.randomUUID() and crypto.getRandomValues() for cryptographically secure pseudo-random number generation.
Problem it solves
Developers frequently need random UUIDs for database seeding, API testing, and mock data without writing one-off scripts or installing CLI packages.
How it was built
Built with Web Crypto API getRandomValues() fallback, client-side array batching, and one-click clipboard event handlers.
Frequently Asked Questions
Is the UUID / GUID Generator completely free to use?
Yes, the UUID / GUID Generator is 100% free with no account required, no subscription, and no watermarks.
Does UUID / GUID Generator store any of my data or inputs?
No. All generation and calculations run client-side directly in your browser. None of your data or inputs are sent to or stored on external servers.
Can I use outputs from UUID / GUID Generator for commercial projects?
Yes, all results generated with this tool are free to use for both personal and commercial projects without attribution.