UUID Generator
Generate random UUIDs (v1, v4).
UUID Versions:
- v1 (Time-based): Based on MAC address and current time
- v3 (MD5): MD5 hash of namespace and name
- v4 (Random): Random generation (most common)
- v5 (SHA1): SHA1 hash of namespace and name
Use Cases: Database IDs, session tokens, request tracking, distributed systems
About UUID Generator
UUID Generator produces Universally Unique Identifiers in version 1 (time-based) or version 4 (random) format. UUIDs are the standard way to generate IDs for database rows, API resources, files, and distributed system events without a central authority. You can generate one UUID or a batch of them, and the output is formatted with or without hyphens.
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Frequently Asked Questions
Is UUID Generator free?
Yes, completely free. No signup, no account, no usage limits. Use it as much as you need.
Is my data secure?
All processing happens directly in your browser using JavaScript. Your data is never sent to any server, stored, or shared. It stays entirely on your device.
What is the difference between UUID v1 and UUID v4?
UUID v1 is generated from the current timestamp and your machine MAC address, making it time-sortable but potentially identifying. UUID v4 is purely random and is the more commonly recommended choice for privacy and security.
Are the generated UUIDs truly unique?
UUID v4 has 122 bits of randomness, giving a collision probability so astronomically low it is treated as unique in practice. UUID v1 is unique by construction as long as the clock and MAC address do not repeat.