UUID Generator
Generate v4 (random) UUIDs in bulk. Configurable case, hyphens, and braces. Generate up to 1000 at once and copy with one click.
Generated UUIDs (v4)
UUID Generator runs 100% in your browser
Your files are never uploaded to any server. All processing happens locally on your device using modern browser technology. Private, fast, and free.
0
Uploads
0
Stored
How to Generate UUIDs in Bulk (v4 Random) for Testing and Production
Open the UUID Generator
Navigate to the tool. No signup, nothing to install.
Choose how many
Pick a count between 1 and 1000. Default is 1 for quick single-UUID needs.
Pick a format
Standard lowercase-hyphenated, uppercase, no-hyphens (32 hex chars), or wrapped in braces (Microsoft GUID style).
Generate and copy
Hit Generate, then click any individual UUID to copy it, or Copy All to grab the whole batch.
Pro Tips
- •v4 UUIDs have 122 bits of entropy — collision-resistant enough for any practical use, including primary keys in distributed systems.
- •In code, use crypto.randomUUID() directly — it is native, fast, and cryptographically secure. We use it under the hood.
- •Microsoft’s GUID format is the same data as a UUID, just usually written with braces and uppercase: {XXXXXXXX-XXXX-...}.
- •Avoid UUIDs as URL slugs unless you need opacity — they are long, ugly, and bad for SEO.
- •If you need sequential UUIDs for database insert performance (v7), generate them server-side — v7 is not in the browser API yet.
Who needs UUID Generator?
Students
Academic work and assignments
Professionals
Business and office tasks
Creatives
Design and content creation
Everyone
Personal everyday tasks
When to Use UUID Generator
Database primary keys
Pre-generate UUIDs for inserting test data or seeding a database without round-tripping to the DB for each ID.
API request tracing
Grab a few request IDs or trace IDs for testing logging and observability pipelines.
Feature flag rollouts
Generate user IDs or session IDs for testing percentage-based feature flag bucketing.
Test fixtures
Populate test fixtures and mock data with realistic UUID values instead of hardcoded placeholder strings.
Frequently Asked Questions
What is a UUID v4?
A 128-bit identifier, 122 bits of which are random. It looks like xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx — the 4 marks the version, y is one of 8, 9, a, or b. Effectively unique forever.
Can two UUIDs ever collide?
Mathematically possible, practically never. You would need to generate billions per second for centuries to hit a collision. Safe to use as primary keys without checking for duplicates.
What is the difference between UUID and GUID?
None — GUID is Microsoft’s name for the same standard, often written with braces and uppercase. Pick the format that matches your system’s convention.
Are these UUIDs cryptographically secure?
Yes — we use crypto.randomUUID() and crypto.getRandomValues() under the hood, which pull from the browser’s cryptographic random number generator.
Why is the maximum 1000?
To keep the UI usable. Beyond 1000 you should generate UUIDs in code as needed rather than copy-paste from a web tool.
UUID Generator vs Alternatives
UUID generation is built into most languages, but a quick web tool is handy when you need one outside of code.
uuidgen (CLI)
macOS and Linux built-in
Key difference: Generates one UUID per invocation — awkward for bulk and not available on Windows by default.
Online single-UUID tools
Various web pages
Key difference: Most generate only one UUID at a time without bulk support or format options.
Code in Node / Python / etc.
Native language UUIDs
Key difference: Perfect if you are already in code. Slower for one-off generation when you just need a UUID for a test config.
Bulk generation up to 1000, four format options, copy individual or copy all, all browser-side with cryptographically secure randomness.
Good to know
- All processing happens in your browser. Very large files may be slower on mobile devices or older computers.
- Results depend on the quality and format of your input. For best results, use high-quality source files.
- Once you close the browser tab, all data is gone. Make sure to download your results before closing.
Key Features
100% Free
No hidden fees, no premium tiers, no limits on how much you use it. Free today, free tomorrow, free forever.
Complete Privacy
Your files never leave your device. Everything is processed locally in your browser — we physically cannot access your data.
No Registration
Start using the tool immediately. No account, no email, no personal information required. Just open and use.
Works Everywhere
Compatible with Chrome, Firefox, Safari, and Edge on desktop and mobile. Works offline once the page has loaded.
Full Step-by-Step Guide
Detailed walkthrough with pro tips and best practices for getting the best results every time.
Read guideFrequently Asked Questions
Every common question answered — file limits, privacy, supported formats, compatibility, and more.
View FAQCompare Alternatives
See how UUID Generator stacks up against Adobe, Smallpdf, and other paid and free alternatives.
Compare now