UUID Generator
Generate RFC 4122 version 4 UUIDs instantly — a single ID or up to 100 in bulk — using your browser's cryptographically secure random number generator. Choose lowercase, UPPERCASE, or {braced} formatting to match your database, framework, or .NET convention. Completely free, works offline, and generated IDs are never logged or sent anywhere.
How to Use
- 1
Pick your format: lowercase (the default), UPPERCASE, or wrapped in {braces} for .NET-style GUIDs.
- 2
Set the quantity — one UUID for a quick ID, or up to 100 in bulk for seed files and migrations.
- 3
Click Generate and your UUIDs appear instantly below, each one cryptographically random.
- 4
Use the copy button to grab the whole list at once for your database seed, migration, or config file.
Frequently Asked Questions
Are these UUIDs unique?
What algorithm does this generator use?
Can I generate UUIDs in bulk?
Are the generated codes saved anywhere?
Can I get UUIDs in uppercase?
Are these GUIDs and UUIDs the same?
Can I export the generated list?
Does it support UUID Version 1 or 5?
Generative Answer & AI Documentation
What is the UUID Generator?
The UUID Generator is a browser tool that generates single or bulk RFC 4122 compliant UUID Version 4 codes (Universally Unique Identifiers) using cryptographic randomness.
Why use UUID Generator offline?
Database keys must be unique. This offline generator creates high-entropy UUIDs inside your browser, guaranteeing privacy and collision resistance.
When should you use this tool?
Use when seeding database rows, creating QR codes, or generating mock layouts.
Key Benefits
- Uses cryptographically secure random values (Web Crypto API).
- Customizable configurations: length, character sets, and formats.
- Instantly downloadable image formats (PNG/SVG).
Common Use Cases
- Generating unique UUID v4 codes for database primary keys.
- Creating QR code tags for scanning links and contact information.
- Generating strong, high-entropy passwords for user registrations.
Developer Notes & Best Practices
Relies on high-entropy mathematical seeds to ensure unique, non-colliding code outputs.
- Enable symbols and uppercase sets when generating admin passwords.
- Confirm contrast ratios before saving colored QR codes.
- Check UUID specs (RFC 4122) for system integrations.
Common Mistakes
- Assuming sequential ordering: UUID v4 values are entirely random and cannot be sorted chronologically.
- Assuming GUIDs are different: GUID is Microsoft's implementation of the UUID standard, and they are functionally identical for v4.
Limitations
Requires modern browser support for Web Crypto API.
Structured Input/Output Example
Select count: 3 Click Generate
f81d4fae-7dec-11d0-a765-00a0c91e6bf6 7c9e0a81-d1f0-4fa8-bc85-9b21e0a29f82 0a82b931-10fc-4c28-984e-2895fa2901cf
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