A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. The canonical format is 32 hex digits grouped as 8-4-4-4-12 (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are generated without a central authority and collision probability is vanishingly small.

What is UUID v7 and why is it time-sortable?

UUID v7 (RFC 9562, 2024) embeds a 48-bit Unix millisecond timestamp in the leading bytes, followed by randomness. Because the timestamp is in the high bits, UUIDs sort naturally in creation order, solving the index fragmentation problem of random v4 UUIDs in database primary keys.

Is it safe to generate UUIDs here for production use?

Yes. All UUIDs are generated 100% client-side using the browser cryptographic RNG (crypto.getRandomValues). Nothing is transmitted over the network. The algorithm matches standard libraries like Node crypto.randomUUID and Python uuid.uuid4().

Can two UUIDs collide?

In theory yes, in practice no. A random v4 UUID has 122 bits of entropy — roughly 5.3 x 10^36 possible values. You would need to generate about 2.71 quintillion UUIDs before the collision probability reaches 50%.

What is the difference between UUID and GUID?

They are the same concept. UUID is the RFC 4122 term used in open-source ecosystems. GUID is Microsoft preferred name in .NET, COM, and Windows APIs. The format and semantics are identical.

Encoding & Data

UUID Generator

Free online UUID and GUID generator. Generate UUID v1, v4, v7, NIL, and Max in bulk (up to 1000). Validate and parse UUIDs to extract version, variant, and embedded timestamps. Format output as uppercase, braces, or no-hyphens for .NET, database, and URL use. RFC 4122 and RFC 9562 compliant. 100% client-side, no data uploaded.

Open tool

Quick reference

Category: Encoding & Data
Runs in: Browser
Data stored: Nothing
Price: Free
Sign-up: Not needed

Browse categories

All features

UUID v1, v4, v7, and NIL generation
Bulk generation up to 1000
UUID validation and parsing
Timestamp and variant extraction
Uppercase, braces, and no-hyphen formats
RFC 4122 / RFC 9562 compliant

What you can do

Generate UUIDs in bulk

Generate up to 1000 UUIDs at once. Copy all to clipboard or download as a file for SQL seed scripts and test fixtures.

Use UUID v7 for database keys

Generate time-sortable v7 UUIDs that embed a Unix timestamp, giving you sequential inserts like auto-increment with the distributed benefits of UUIDs.

Validate and inspect a UUID

Paste any UUID to see its version, variant, embedded timestamp (v1/v7), and normalized canonical form. Accepts braces, uppercase, and no-hyphen input.

Format UUIDs for different systems

Toggle uppercase for .NET APIs, braces for Windows registry, or no-hyphens for compact storage as CHAR(32).

Generate NIL and Max sentinels

Produce the special all-zeros NIL UUID for unset sentinels or the all-Fs Max UUID for range queries and tombstone markers.

Private by design

Client-side
No sign-up
Free

UUID Generator runs entirely in your browser tab. No data is uploaded, no server processes your input, and no account is required.

Specifications

Versions: v1, v4, v7, NIL, Max
Standards: RFC 4122, RFC 9562 (2024)
Bulk generation: Up to 1000 per batch
Output formats: Canonical, uppercase, braces, no-hyphens
Random source: crypto.getRandomValues() (CSPRNG)
Processing: 100% client-side, no upload

Frequently asked questions

Related keywords

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