Online UUID Generator - V1 & V4 GUIDs | ToolsAid
Free Online UUID Generator. Generate Universally Unique Identifiers (UUID v4 & v1). Bulk generate up to 1000 GUIDs instantly for databases and testing.
Settings
Type: Randomly generated UUID. Best for most use cases due to very low collision probability.
Generated UUIDs
key Features
- Generate UUID Version 4 (Randomized)
- Generate UUID Version 1 (Timestamp based)
- Bulk generation (1 to 1000 IDs per batch)
- One-click Copy and Export
- Cryptographically secure randomness
The Online UUID Generator produces Universally Unique Identifiers (UUIDs), also known as GUIDs (Globally Unique Identifiers).
These are 128-bit numbers formatted as hexadecimal strings (e.g., 550e8400-e29b-41d4-a716-446655440000).
Why use UUIDs? In distributed systems (like microservices or cloud databases), using simple auto-incrementing integers (1, 2, 3...) causes conflicts when merging data. UUIDs solve this by ensuring that every ID generated, anywhere in the world, is unique.
Supported Versions
- Version 4 (Random): The most popular choice. It relies on random numbers and has no relation to the time or machine.
- Version 1 (Time-based): Uses the current timestamp and your device's MAC address. Useful if you need IDs that are sortable by creation time.
Frequently Asked Questions
Can UUIDs collide (be identical)?
Theoretically, yes. Practically, no. The probability of a collision in UUID v4 is so astronomically low (1 in 2^122) that you would need to generate billions per second for a century to have even a tiny chance.
What is the difference between v1 and v4?
UUID v1 is generated using your computer's MAC address and current timestamp (guaranteeing uniqueness but revealing time/location). UUID v4 is completely random and safe for privacy.
Is this tool secure?
Yes. We use the browser's `crypto.getRandomValues()` API to ensure high-entropy, cryptographically secure IDs. No data is sent to our server.
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