UUID Generator
Instantly generate UUID v1 and v4 identifiers — bulk generate, copy, and download unique IDs for any project.
Generate UUIDs
Generated UUIDs
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How to Use the UUID Generator
- Select UUID Version
Choose UUID v4 (random) or UUID v1 (timestamp-based) from the version dropdown.
- Set Quantity
Enter how many UUIDs you need — from 1 up to 100 at a time.
- Choose Format
Select uppercase or lowercase output format for your UUIDs.
- Generate UUIDs
Click the Generate UUID button to instantly create your unique identifiers.
- Copy or Download
Copy all generated UUIDs to clipboard or download them as a .txt file.
Key Features
UUID v4 Support
Generate cryptographically random UUIDs using the browser's secure crypto API — not Math.random().
UUID v1 Support
Generate timestamp-based UUIDs that are sequential and time-ordered, great for log IDs.
Bulk Generation
Generate up to 100 UUIDs in a single click. No page reloads, no waiting.
One-Click Copy
Copy all generated UUIDs to your clipboard with a single button tap — ready to paste anywhere.
Download as .txt
Download your UUIDs as a plain text file to use in scripts, seeding databases, or test data.
100% Client-Side
Nothing is sent to any server. All generation happens in your browser. Your UUIDs stay private.
How UUID Generation Works
UUID v4 Structure (RFC 4122)
UUID v1 Structure (RFC 4122)
| Component | Bits | Purpose |
|---|---|---|
| Version | 4 | Identifies UUID version (1 or 4) |
| Variant | 2–3 | Identifies RFC 4122 compliance |
| Random / Timestamp | 122 / 60 | Core uniqueness source |
| Total Length | 128 bits | 36 characters with hyphens |
UUID v4 uses crypto.getRandomValues() — the same API browsers use for cryptographic operations — giving 2122 possible values (approximately 5.3 × 1036). UUID v1 is generated using the current timestamp in 100-nanosecond intervals since 15 October 1582, combined with a simulated node ID.
Practical Examples
What Is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. Standardized by RFC 4122, the UUID format consists of 32 hexadecimal characters displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. No central registry is needed — any system can generate a UUID and be confident it will not collide with any other UUID ever generated.
UUID v4 is the most commonly used version. It relies on random number generation and offers an astronomically large number of possible values. UUID v1, on the other hand, encodes the generation timestamp and a node identifier, making it useful in systems where time-ordering of identifiers matters — such as distributed log systems or event streams.
UUIDs are foundational to modern software engineering. They appear as primary keys in databases, session tokens in authentication systems, correlation IDs in microservices, file identifiers in cloud storage, and transaction IDs in payment processing. Understanding when to use v1 versus v4 can meaningfully impact the design and privacy of your system.
UUID — Understood Globally
Want to learn more about UUIDs, how versions differ, and when to use them in real projects?
Read the Full Guide on Our Blog →Frequently Asked Questions
Is this UUID generator tool free to use?
What is the difference between UUID v1 and UUID v4?
Are the generated UUIDs truly unique?
Can I use these UUIDs in a database as primary keys?
What is a GUID and is it the same as a UUID?
How many UUIDs can I generate at once?
Is it safe to use UUID v1 in public-facing systems?
Does this tool store the UUIDs I generate?
What format is a UUID in?
Can I use these UUIDs in JavaScript, Python, or Java projects?
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