UUID Generator Online Free — Generate UUID v4 & v7 in Browser (2026)

Generate UUID v4 (random) and v7 (time-ordered) identifiers online for free. Bulk generate up to 100 at once, copy to clipboard, or download as a file. 100% browser-based — nothing is uploaded to any server.

What is a UUID?

A Universally Unique Identifier (UUID) is a 128-bit label used for unique identification in software. UUIDs are standardized by RFC 4122 and later RFC 9562. They are widely used as database primary keys, API identifiers, session tokens, and distributed system identifiers because they can be generated independently without central coordination.

A standard UUID is represented as 32 hexadecimal digits displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.

UUID v4 vs v7

UUID v4 generates identifiers entirely from random numbers. 122 bits are randomly generated (6 bits reserved for version/variant markers). These are simple and universally supported but have random ordering, which can lead to poor database index performance due to B-tree page splits.

UUID v7 embeds a Unix timestamp (millisecond precision) in the first 48 bits, with random bits for uniqueness. This makes them sortable by creation time, which significantly improves database primary key performance (sequential insertion instead of random). UUID v7 was standardized in RFC 9562 (May 2024).

Why Use a Browser-Based UUID Generator?

Privacy: Your UUIDs are generated locally using your browser's crypto API. No data is sent to any server.
Offline: Works without internet after the first page load. No backend dependency.
Fast: Generate hundreds of UUIDs instantly — no network latency.
Free: Unlimited generation, no accounts, no signups, no hidden limits.

Generate UUIDs Free Now →

Frequently Asked Questions

What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. It's used to uniquely identify information in software systems without requiring central coordination.

What is the difference between UUID v4 and v7?
UUID v4 is fully random, while UUID v7 embeds a Unix timestamp (millisecond precision) in the first 48 bits. UUID v7 is sortable by creation time and performs better as database primary keys.

Can I generate UUIDs offline?
Yes — this UUID generator runs entirely in your browser using crypto.getRandomValues(). No server connection needed. Works fully offline after first load.

Can I generate multiple UUIDs at once?
Yes — generate up to 100 UUIDs at a time in bulk. Copy individual UUIDs or download all results as a file.

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