A UUID (Universally Unique Identifier) is a 128-bit number represented as 32 hex digits in five hyphen-separated groups, such as 550e8400-e29b-41d4-a716-446655440000. UUIDs are used in databases, APIs, and distributed systems where unique identifiers are needed without a central authority.

UUID Generator — Free Online v4, v7, v1 UUID Tool

UUID Generator

Generate v4, v7, v1 & NIL UUIDs — Instantly In Your Browser

Choose your UUID version, set quantity up to 100, apply format options, and export as plain text, JSON, or CSV. Includes a built-in validator to decode and inspect any UUID. All generation runs locally — your data never leaves your device.

🔒 Runs entirely in your browser — UUIDs are generated locally and never transmitted to any server

Version

Quantity 1 – 100

Format Uppercase No Hyphens Braces { }

Output Format

Output

Validate / Decode a UUID

All UUID generation runs locally in your browser. No data you enter is ever transmitted to a server. UUIDs are not guaranteed unique in all scenarios — always validate for critical production use.

How to Use the UUID Generator

Choose a UUID Version

Use the version tabs to select v4 (random — best for general use), v1 (timestamp + MAC address), v7 (time-ordered — best for database primary keys per RFC 9562), or NIL (all-zeros placeholder). v4 is the default and the most widely supported.

Set Quantity and Format Options

Enter how many UUIDs to generate from 1 to 100. Apply Uppercase for systems requiring capital hex, No Hyphens for compact 32-character identifiers, or Braces { } for Microsoft .NET and C# style GUIDs. Choose Plain List, JSON Array, or CSV for your bulk output format.

Click Generate

Press the Generate button. UUIDs are created instantly using crypto.randomUUID() and crypto.getRandomValues() — the browser's cryptographically secure random number generator. The count, version, and format are shown above the output panel. Press Enter in the quantity field to generate without the mouse.

Copy, Download, or Validate

Click Copy to copy the entire output to your clipboard, or Download to save as a .txt, .json, or .csv file. Use the Validate / Decode panel to paste any UUID and instantly see its version, RFC variant, and what that version is used for.

Frequently Asked Questions

What is a UUID?

What is the difference between UUID v4, v1, v7, and NIL?

Are the UUIDs generated here cryptographically secure?

What is a Version 7 UUID and why should I use it?

What is the NIL UUID used for?

Can I use UUIDs as database primary keys?

UUID Generator

How to Use the UUID Generator

Frequently Asked Questions

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