⚙️ Developer Tools
UUID Generator
Generate UUID v4 (random) or bulk UUIDs for databases, APIs and application development. Cryptographically secure, runs in your browser.
Click to generate a UUID
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Free UUID Generator — Generate UUID v4 Online
Our free UUID generator creates Version 4 UUIDs using cryptographically secure random generation. Generate one or many at once in standard, uppercase or no-hyphens format. Used as unique database keys, session tokens and API identifiers.
🔑 UUID v4
Cryptographically random, globally unique IDs.
📦 Bulk Generate
Generate 1–100 UUIDs at once.
📋 Copy All
One-click copy of all generated UUIDs.
🔒 Private
Generated locally using browser crypto API.
How to Use — Step by Step
1
Choose quantity
Set how many UUIDs you need — 1 to 100.
2
Select format
Standard (lowercase with hyphens), uppercase, or no hyphens.
3
Generate
Click Generate. UUIDs appear instantly.
4
Copy
Click Copy All or click any individual UUID to copy just that one.
Frequently Asked Questions
What is a UUID?
A 128-bit Universally Unique Identifier displayed as 32 hex characters: 550e8400-e29b-41d4-a716-446655440000. Probability of two random v4 UUIDs colliding is practically zero.
UUID v1 vs v4?
v1 uses timestamp + MAC address (privacy concern). v3/v5 are deterministic from a namespace. v4 is fully random — most widely used for general-purpose IDs.
Can two UUIDs ever be the same?
Theoretically yes, practically no. v4 has 122 random bits — you would need to generate 2.7×10¹⁸ UUIDs to have a 50% collision chance.
Are UUIDs good database primary keys?
Excellent when you need globally unique IDs across systems. Trade-off: larger storage (36 chars) and less efficient indexing than sequential integers.
What is a ULID?
Universally Unique Lexicographically Sortable Identifier — a UUID alternative that is time-sortable, improving database index performance.
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