Free UUID / GUID Generator Online
Generate UUID v1 (timestamp-based) and UUID v4 (random) instantly. Bulk generate up to 1000 UUIDs with format options. 100% client-side — your data stays private.
How to Use the UUID Generator
- Select UUID version — v4 (random) or v1 (timestamp-based).
- Set the count (1–1000) for bulk generation.
- Choose uppercase or lowercase output.
- Toggle hyphens on or off.
- Click "Generate UUIDs" and copy the results.
Why Use This UUID Generator
UUIDs are essential for database primary keys, API identifiers, session tokens, and distributed systems. This tool generates valid UUIDs entirely in your browser — no server calls, no logs, no tracking.
Need thousands of UUIDs for a data migration? Set the count to 1000 and copy them all at once. Working with case-sensitive systems? Toggle uppercase. Need compact IDs without hyphens? Done in one click.
Frequently Asked Questions
UUID v1 is based on the current timestamp and MAC address, making it time-ordered but potentially traceable. UUID v4 is purely random, offering better privacy and unpredictability. Use v4 for most modern applications.
Yes. Both v1 and v4 UUIDs generated by this tool conform to the RFC 4122 standard, including the correct version (4 or 1) and variant bits.
You can generate up to 1000 UUIDs per batch. There is no daily limit — generate as many batches as you need.
No. Everything happens in your browser using the Web Crypto API. No data is ever sent to any server.
Use Cases
Database Primary Keys
Generating unique database primary keys with UUIDs ensures no collisions in distributed systems and microservices.
Session Identifiers
Creating session identifiers helps web applications track user sessions securely without exposing sequential IDs.
API Request IDs
Producing API request IDs enables accurate logging, debugging, and tracing of requests across distributed systems.
Bulk Test Data IDs
Bulk generating test data IDs accelerates development and testing by providing unique identifiers for sample datasets.
Unique Transaction References
Creating unique transaction references ensures financial records are traceable and auditable in payment systems.