Generate Secure Universally Unique Identifiers Instantly
A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit identifier used to uniquely identify information in computer systems. UUIDs are designed to be unique across both space and time, making them ideal for distributed systems where generating IDs without central coordination is necessary.
The standard UUID format is a 36-character string consisting of 32 hexadecimal digits displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. For example: 550e8400-e29b-41d4-a716-446655440000
Our free online UUID generator provides a fast, secure, and easy way to create unique identifiers for your applications, databases, and systems. Whether you need a single UUID or thousands in bulk, our tool handles it instantly with customizable format options.
Generate UUID v1 (timestamp-based) and UUID v4 (randomly generated) to meet different use case requirements.
Create up to 1,000 UUIDs at once for large-scale projects and database seeding operations.
Toggle hyphens, braces, and case sensitivity to match your exact formatting needs.
One-click copying to clipboard for both single and bulk-generated UUIDs.
All generation happens in your browser. No data is sent to servers, ensuring complete privacy.
Generate as many UUIDs as you need, completely free with no registration required.
UUID v1 generates identifiers based on the current timestamp and the MAC address of the computer generating the UUID. This version is useful when you need UUIDs that can be sorted by creation time. However, because it includes the MAC address, it may expose information about the host system.
Best for: Situations where temporal ordering is important and privacy concerns about the MAC address are minimal.
UUID v4 uses random or pseudo-random numbers to generate identifiers. This is the most commonly used UUID version because it provides strong uniqueness guarantees without exposing any system information. The probability of collision is extremely low (nearly impossible in practical scenarios).
Best for: General-purpose unique identifier generation, API keys, session IDs, and any scenario requiring privacy and randomness.
Database Primary Keys: Use UUIDs as primary keys in distributed databases to avoid ID conflicts across multiple servers.
API Development: Generate unique identifiers for API requests, session tokens, and resource IDs.
File Naming: Create unique filenames to prevent conflicts when uploading or storing files.
Distributed Systems: Coordinate unique identifiers across microservices without central ID generation.
Testing & Development: Generate test data with unique identifiers for quality assurance and development environments.
Tracking & Analytics: Create unique tracking IDs for users, events, or transactions.
Cloud Storage: Generate unique object keys for cloud storage services like AWS S3 or Azure Blob Storage.
Message Queues: Assign unique message IDs in queue systems like RabbitMQ or Apache Kafka.
The standard UUID format includes hyphens separating the five groups of hexadecimal digits. Toggle this option to remove hyphens for a compact 32-character string.
With hyphens: 550e8400-e29b-41d4-a716-446655440000
Without hyphens: 550e8400e29b41d4a716446655440000
Some systems and programming languages prefer UUIDs wrapped in curly braces. This format is common in Microsoft technologies and certain configuration files.
With braces: {550e8400-e29b-41d4-a716-446655440000}
Control the letter case of the hexadecimal characters. While UUIDs are case-insensitive, different systems may have preferences.
Lowercase: 550e8400-e29b-41d4-a716-446655440000
Uppercase: 550E8400-E29B-41D4-A716-446655440000
Yes, UUIDs are designed to be universally unique. UUID v4 uses cryptographically strong random number generation, making the probability of collision astronomically low (1 in 2^122). For practical purposes, you can consider them completely unique.
Absolutely. Our UUID generator uses the browser's built-in crypto.getRandomValues() API, which provides cryptographically secure random numbers. All generation happens locally in your browser, so no data is transmitted to any server.
UUID v1 is timestamp-based and includes the MAC address, making it sortable by time but potentially exposing system information. UUID v4 is randomly generated, providing better privacy and is the most widely used version for general purposes.
Yes, UUIDs are commonly used as primary keys, especially in distributed databases. They eliminate the need for centralized ID generation and prevent conflicts when merging data from multiple sources. However, they do consume more storage space than sequential integers.
Our bulk generation feature allows you to create up to 1,000 UUIDs in a single operation. If you need more, you can simply run the generator multiple times.
UUIDs are case-insensitive by specification, meaning "A" and "a" represent the same value. However, our tool allows you to choose your preferred case format to match your system's conventions.