Generate UUID v4 or v1 instantly for databases, APIs, and distributed systems. This UUID generator runs locally and produces cryptographically strong identifiers with bulk output.

This page is the canonical UUID generator for DevTools360 and is updated regularly to match RFC 4122 guidance.

1. Select version: Choose UUID v4 (random) or v1 (time-based).
2. Set quantity: Generate 1–100 UUIDs in bulk.
3. Copy output: Use the IDs in your database, API, or app.

UUID v4 example:

550e8400-e29b-41d4-a716-446655440000

UUID v1 example:

f47ac10b-58cc-11cf-a447-00145e454321

The two most common UUID versions are v4 (random) and v1 (time-based). Each has distinct characteristics:

• UUID v4 (Random): Uses cryptographically strong random numbers. Provides no information about when or where it was created. Most commonly used version. Recommended for most applications due to privacy and security benefits. No risk of revealing system information.
• UUID v1 (Time-based): Includes a timestamp and MAC address. Sortable by creation time. Can reveal information about the generating machine. Useful when you need chronological ordering or when debugging distributed systems. If you need to work with Unix timestamps, check out our Unix Timestamp Converter.

For most modern applications, UUID v4 is the recommended choice. It provides better privacy (no information leakage), security (no predictable patterns), and is simpler to implement. Use UUID v1 only when you specifically need time-based ordering or when working with legacy systems that require it.

• Using v1 in public APIs: v1 can reveal timing and device info.
• Trimming hyphens: Some parsers expect the standard hyphenated form.
• Reusing UUIDs: Treat UUIDs as immutable identifiers.
• Sorting as strings: v4 is random and not time-ordered.

Choosing between UUIDs and auto-increment IDs depends on your application's requirements:

Modern applications often use UUIDs for primary keys in distributed systems and APIs, while auto-increment IDs remain popular for internal database relationships and performance-critical applications. Many systems use a hybrid approach: UUIDs for external-facing identifiers and auto-increment IDs for internal relationships. When working with APIs that return JSON data with UUID identifiers, you can use our JSON Viewer tool to inspect and validate the response structure.

• Database Primary Keys: Using UUIDs as primary keys allows for distributed ID generation and prevents conflicts when merging databases
• API Identifiers: UUIDs provide opaque identifiers that don't reveal internal system structure or sequential information
• Session Tokens: Generating unique session identifiers for user authentication and authorization
• File Identifiers: Creating unique identifiers for files in storage systems, especially in distributed file systems
• Event IDs: Tracking events in event-sourced systems where each event needs a unique identifier
• Microservices: Generating IDs independently across multiple services without coordination
• Data Synchronization: Merging data from multiple sources without ID conflicts
• Security: Using UUIDs to avoid exposing sequential patterns that could be exploited

• JSON viewer to inspect API payloads containing UUIDs.
• Unix timestamp converter for v1 time-based debugging.
• Regex tester to validate UUID formats.

All UUID generation happens entirely in your browser using JavaScript and crypto-safe random number generators. Your data never leaves your device, is never sent to any server, and is never stored. This privacy-first approach ensures that sensitive identifiers like database keys, API tokens, or session IDs remain completely private and secure. Whether you're generating UUIDs for development, testing, or production use, your data stays local and secure.

• RFC 4122 - A Universally Unique Identifier (UUID) URN Namespace

Maintained by the DevTools360 team. Last updated: 2026-01-15. We focus on cryptographically strong UUID generation for production workflows.