UUID v4 Generator Online
Generate UUID v4 values
Como usar UUID Generator
- 1
Click Generate
A new cryptographically random UUID v4 is created instantly.
- 2
Generate multiple
Set the count to generate a batch of UUIDs at once.
- 3
Copy UUIDs
Copy individual UUIDs or all generated UUIDs as a list with one click.
Perguntas frequentes
Is my data safe?
What is a UUID v4?
Will UUIDs ever collide?
What is the difference between generate/uuid and dev/uuid?
Can I use this UUID as a password or security token?
Saiba mais
O que é UUID Generator?
Generate cryptographically random UUID v4 identifiers instantly for any use case. Create a single UUID to paste into a form or system, or generate multiple UUIDs at once for batch use. Powered by the browser's Web Crypto API for true cryptographic randomness. UUIDs are used everywhere — as record IDs, file names, tracking codes, and unique tokens. No software to install, no account to create, no usage limits. Generated entirely in your browser.
Por que usar UUID Generator?
- Cryptographically secure — uses crypto.randomUUID() or crypto.getRandomValues(), not weak pseudo-random generators.
- Bulk generation — create one or many UUIDs at once, ready to copy as a list.
- No accounts or limits — generate as many UUIDs as you want without signing up.
- Instantly copyable — one-click copy for a single UUID or all generated UUIDs at once.
- Completely private — nothing is logged or sent to any server.
Casos de uso de UUID Generator
Quick record IDs
Need a unique ID for a spreadsheet row, document, or quick prototype? Generate a UUID and paste it in seconds without writing any code.
File naming
Name files with UUIDs to guarantee uniqueness without coordination — useful for uploads, exports, and generated reports.
Form and system fields
Some systems require a UUID in a specific field. Generate one here and paste it directly into the form or configuration.
Testing and QA
Generate batches of UUIDs for populating test data, mock IDs, or seeding a development database without writing a script.
Dicas e boas práticas
- 💡A UUID always follows the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx — 32 hexadecimal digits grouped in five sections separated by hyphens.
- 💡UUIDs are case-insensitive — systems that require uppercase (some Microsoft tools) and lowercase (most web systems) treat the same UUID identically.
- 💡If you need UUIDs for a production application, generate them in your application code rather than copying from a website. This tool is best for one-off and testing needs.
- 💡For database primary keys at scale, consider UUID v7 (time-ordered), which avoids index fragmentation that random UUIDs can cause in B-tree indexes.
Como se compara
Most operating systems include UUID generators: uuidgen on Linux/Mac, and PowerShell's [Guid]::NewGuid() on Windows. Online UUID generators are useful when you do not have terminal access or need to generate UUIDs quickly from a browser tab. For developers who need UUIDs in application code, use your language's built-in library (Python's uuid module, Node.js's crypto.randomUUID, Java's UUID.randomUUID). This tool is best for quick, no-code UUID generation.