Generate UUID v4 (random) and UUID v7 (time-ordered) in bulk. Multiple output formats. Validate UUIDs instantly. Free, no registration, nothing sent to any server.
The most widely used UUID version. Generates 122 bits of cryptographically random data using crypto.randomUUID() — collision-safe by design.
RFC 9562 compliant UUIDs with a millisecond timestamp prefix. Sortable, database-friendly, and perfect for primary keys in modern applications.
Generate 1 to 100 UUIDs in one click. Copy individual UUIDs or copy all at once with a single button.
Standard, UPPERCASE, no-dashes, with braces {}, or URN format. One click to switch between them.
Paste any UUID to instantly validate it. Detects version, normalizes braces/no-dash/URN formats, and shows the canonical form.
Everything runs in your browser using the Web Crypto API. No UUIDs are ever sent to any server — completely safe for sensitive projects.
550e8400-e29b-41d4-a716-446655440000550E8400-E29B-41D4-A716-446655440000550e8400e29b41d4a716446655440000{550e8400-e29b-41d4-a716-446655440000}urn:uuid:550e8400-e29b-41d4-a716-446655440000UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. Also called GUID (Globally Unique Identifier) in Microsoft environments. A UUID looks like: 550e8400-e29b-41d4-a716-446655440000. The probability of generating a duplicate UUID v4 is astronomically low — you'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of collision.
UUID v4 is entirely random (122 random bits), making it the most common and widely supported version. UUID v7 (RFC 9562) uses the first 48 bits for a Unix timestamp in milliseconds, followed by random bits. This makes v7 UUIDs time-sortable and more database-efficient since they produce sequential index entries, reducing index fragmentation.
Yes, they are functionally identical. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They use the same 128-bit format and are fully interchangeable.
Yes. This tool uses the browser's crypto.randomUUID() and crypto.getRandomValues() APIs, which are cryptographically secure random number generators. The UUIDs are safe for use as session tokens, API keys, and database primary keys.
UUID v7 is recommended for database primary keys because it's time-ordered, which means database indexes remain sequential and avoid the fragmentation issues caused by random v4 UUIDs. For everything else (tokens, file names, API identifiers), v4 is perfectly fine.
No. UUID generation and validation happens entirely in your browser using the Web Crypto API. Nothing is ever sent to any server — making this tool safe to use even in air-gapped environments.