UUID Generator

Generate UUID v4, v7, or NIL identifiers in batch. Customize format: uppercase or lowercase, with or without hyphens and braces. All generation happens in your browser — fast and private.

UUID Generator — Bulk Create v1 / v4 UUIDs Online

ToolOverview

UUIDs (Universally Unique Identifiers) are 128-bit identifiers that are practically unique without central coordination. This tool generates UUID v1 (timestamp + MAC) and v4 (fully random) versions, in single or batch mode. All UUIDs are created using the browser's crypto.randomUUID() API — secure, fast, and never sent to a server. Perfect for database keys, filenames, order numbers, and tracking IDs.

How to use

Pick a UUID version (v4 random or v1 timestamp)
Choose how many to generate (1–1000)
Click "Generate"; results appear below; copy with one click

Use Cases

Database primary keys (better than auto-increment for distributed systems)
Unique filenames after file uploads to prevent collisions
Order numbers, tracking IDs, ephemeral tokens
React/Vue list keys (a must for stable rendering)

FAQ

Q: Are UUIDs truly unique?
A: Practically yes — 2¹²² possible values means collisions are negligible.

Q: When should I use v1 vs v4?
A: Use v4 (random) for almost everything. Pick v1 only if you need time ordering.

Q: Is anything uploaded?
A: No. Generation is 100% local.

Tips & Related Tools

Store UUIDs as CHAR(36) or BINARY(16). They use about 2x more space than auto-increment.

Need time ordering? v1. Need only uniqueness? v4.

Want shorter IDs? Try the random number generator or a NanoID-style scheme.

Common Use Cases

Use the UUID Generator Online Free online for these scenarios:

Daily work:: Bookmark this tool, use directly when needed, save time

Easy to use:: Runs in web browser, no software installation needed
Data safety:: All processing in your local browser, files not uploaded to server

Free to use:: Completely free, no signup, no watermarks, no feature limits
Cross-platform: Mac, Windows, Linux, mobile all work, just need a browser

Frequently Asked Questions

Here are the most common questions:

Q: Is this tool safe?
A: Yes. 100% client-side, data not uploaded, disappears when page closes.

Q: Do I need to register?
A: No. No login, no account, use directly.

Q: Are there usage limits?
A: No. Completely free, unlimited use.

Q: Does it support mobile?
A: Yes. All modern browsers work, including mobile.