UUID Generator — Free Random GUID Maker Online
Generate random UUIDs online for free. Create unique identifiers quickly for applications, databases, software development, testing, and web projects.
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About This Tool
Introduction: Generate UUIDs Instantly with Trencada's UUID Generator
A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify information — database records, users, transactions, files, API resources, and more — without any central coordination. A standard UUID looks like 550e8400-e29b-41d4-a716-446655440000: 32 hexadecimal characters in five groups separated by hyphens.
The Trencada UUID Generator creates cryptographically random UUIDs instantly in your browser. Everything is generated locally using your browser's built-in secure random number generator — 100% client-side, so nothing is sent to a server and your identifiers are never stored or logged.
How to Use the UUID Generator
Creating UUIDs takes seconds:
- Enter the Number of UUIDs you need (from 1 up to 1,000) — the counter below confirms how many will be generated.
- Choose a UUID Version: Version 4 (Random), the classic random UUID, or Version 7 (Time-ordered), which embeds a timestamp so values sort by creation time.
- Set your Format Options: lowercase or uppercase characters, with or without hyphens, and optionally add the
urn:uuid:prefix. - Under Output Options, optionally Wrap each UUID in quotes or Format as JSON array for direct use in code.
- Click Generate UUIDs — your UUIDs appear instantly in the results area.
- Use Copy UUIDs to copy them all to your clipboard, or Start Over to reset the tool.
Key Features
UUID Version 4 and Version 7
Generate classic random v4 UUIDs or modern time-ordered v7 UUIDs that are sortable by creation time — ideal for database keys and time-series data.
Bulk Generation Up to 1,000
Create a single UUID or up to 1,000 at once, perfect for seeding databases, test fixtures, and migration scripts.
Flexible Formatting
Switch between lowercase and uppercase, include or remove hyphens, add the urn:uuid: prefix, wrap values in quotes, or output a ready-to-paste JSON array.
Cryptographically Secure Randomness
UUIDs are generated with your browser's built-in secure random number generator (crypto.getRandomValues), not a weak pseudo-random function.
One-Click Copy
Copy all generated UUIDs to your clipboard in one click for immediate use in applications, queries, or configuration files.
100% Client-Side Privacy
Every UUID is generated locally in your browser. Nothing is uploaded, transmitted, or stored by Trencada — your identifiers stay private.
Free and Unlimited
Generate as many UUIDs as you need, with no sign-up, no installation, and no usage limits.
Why Choose Trencada?
Trencada offers a growing collection of free, no-signup online tools for developers, students, and professionals. The UUID Generator pairs perfectly with companion tools like our Hash Generator for creating checksums and digests, and our Timestamp Converter for working with Unix time.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value used to identify information or objects in computer systems without requiring a central registry. It is standardized by RFC 9562 (formerly RFC 4122).
What is a UUID used for?
UUIDs are commonly used for database primary keys, user and session IDs, transaction references, file identifiers, API resources, distributed systems, and test data.
Are UUIDs unique?
Practically, yes. Version 4 UUIDs use 122 bits of secure randomness, making the probability of a collision astronomically small — far lower than the chance of a hardware failure corrupting your data.
What does a UUID look like?
A standard UUID is displayed as 32 hexadecimal characters in five groups separated by four hyphens, for example: 550e8400-e29b-41d4-a716-446655440000.
What is the difference between UUID v4 and v7?
Version 4 UUIDs are fully random. Version 7 UUIDs embed a Unix timestamp in the first 48 bits, so they are time-ordered and sortable by creation time — useful for database indexes and time-series data, while remaining unique thanks to their random portion.
How many UUIDs can I generate at once?
You can generate from 1 up to 1,000 UUIDs in a single batch. Just enter the number you need and click Generate UUIDs.
Is the UUID Generator free?
Yes. You can generate unlimited UUIDs online for free using the Trencada UUID Generator, with no sign-up required.
Do I need to install software?
No. The UUID Generator works directly in your web browser on desktop, tablet, or mobile, so no additional software is required.