Best for database primary keys
Best UUID Generator for Database Primary Keys (2026)
Using UUIDs as primary keys prevents ID collision in distributed systems, eliminates sequential ID enumeration attacks, and enables offline record creation. A fast UUID generator saves time during development and data seeding.
Tool Comparison
UUID Generator
RecommendedGenerates cryptographically random UUID v4 values with bulk generation support.
Best for: Generating primary keys for database records and unique identifiers for distributed systems
Pros
- Cryptographically random UUID v4
- Bulk generation — create multiple UUIDs at once
- One-click copy
- Standard RFC 4122 compliant format
Cons
- UUID v4 only — no v1 (time-based) or v7 (sortable) variants
Recommended Workflow
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1
Click Generate to create a new UUID v4
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2
Use bulk mode to generate multiple UUIDs for seeding test data
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3
Copy UUIDs directly into your SQL inserts or API requests
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4
Each UUID is guaranteed unique — no collision checks needed
Frequently Asked Questions
Will two UUIDs ever be the same?
UUID v4 has 122 random bits, giving 5.3×10^36 possible values. The probability of collision is effectively zero — you'd need to generate 1 billion UUIDs per second for 86 years to have a 50% chance of one collision.
Should I use UUIDs or auto-increment IDs?
UUIDs are better for distributed systems, public-facing IDs (prevents enumeration), and offline creation. Auto-increment is better for simple apps, better index performance, and when you need sortable IDs.
Are UUID v4 values sortable?
No. UUID v4 is purely random. If you need sortable unique IDs, consider UUID v7 (time-ordered) or ULID. For most applications, UUID v4 with a separate created_at timestamp works perfectly.
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