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Free UUID Generator Online – Generate Cryptographically Secure UUID v4
Generate cryptographically secure UUID v4 online for free. Single or bulk up to 100. Uppercase, lowercase, with or without hyphens. No signup needed.
✅ 100% Free⚡ Instant Results🔒 No Signup📱 Mobile Friendly🔐 No Data Stored
UUID v4 GeneratorCryptographically random
UUID v4 — Randomly generated. The probability of generating duplicate UUIDs is astronomically low (~1 in 5.3×10³⁶). Perfect for database primary keys, session tokens, and request IDs.
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Common Use Cases
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Database Primary Keys
Use UUID v4 as primary keys in PostgreSQL, MySQL, MongoDB, and SQLite.
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Session Tokens
Generate secure session IDs and request correlation IDs for API logging.
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Cloud File Names
Create unique file names for S3 buckets and Firebase Storage to prevent naming conflicts.
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Test Data
Generate unique identifiers for unit test fixtures and integration test payloads.
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Event Tracking
Assign unique IDs to analytics events and user actions in tracking systems.
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Document IDs
Generate document IDs for Firestore, DynamoDB, and other document databases.
Frequently Asked Questions
What is UUID v4?
A randomly generated 128-bit identifier with 5.3×10³⁶ possible values — duplicates are statistically impossible.
Is UUID the same as GUID?
GUID (Microsoft) and UUID (standard) are effectively identical and interchangeable in most contexts.
Are generated UUIDs truly unique?
Yes — uses the browser crypto.randomUUID() cryptographically secure API.
Can I generate UUIDs in bulk?
Yes — set any quantity from 1 to 100 and generate them all at once.
Is the generator free?
Yes — no account, no limits, no API keys needed.