UUID Generator
Generate cryptographically secure Version 4 (random) and Version 7 (time-ordered) Universally Unique Identifiers with batch options and version inspection.
UUID Generator & Inspector Engine
Fast batch generation for database primary keys, distributed tracking tokens, and APIs.
Client-Side Cryptographic UUIDv4 & UUIDv7 Generation
Universally Unique Identifiers (UUIDs) serve as unique primary keys in relational databases, distributed tracing correlation IDs, and global session tokens. Version 4 provides 122 bits of random entropy, while Version 7 introduces time-ordered sorting to optimize database B-tree index performance.
The UUID Generator provides an instant, browser-local tool to batch-generate cryptographically secure UUIDv4 and UUIDv7 identifiers, format outputs with customized case and hyphenation rules, and inspect version metadata of existing UUIDs.
Core Tool Capabilities
- Cryptographic RNG Security: Uses web browser Web Crypto API (crypto.getRandomValues) for high-entropy randomness.
- UUIDv4 & UUIDv7 Support: Generate standard RFC 4122 Version 4 random UUIDs or RFC 9562 Version 7 time-ordered UUIDs.
- Batch Output & Custom Formats: Generate up to 100 UUIDs per batch formatted as standard, uppercase, compact, or braced.
- UUID Version & Timestamp Inspector: Inspect any UUID string to parse its version digit, variant standard, and embedded timestamp.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • Database Primary Keys
- • Distributed Tracing Tokens
- • API Session & Auth Tokens
- • Test Fixture & Mock Data Generation
Technical Specifications & Platform Limits
RFC 4122 and RFC 9562 standards
Instant batch generation
Uses Web Crypto API in local browser runtime
Generated identifiers never leave local memory
Step-by-Step Workflow
Select UUID Version
Choose UUIDv4 for random entropy or UUIDv7 for time-ordered database primary keys.
Set Batch Quantity & Formatting
Pick batch count (1 to 100), toggles for uppercase/lowercase, and hyphenation preferences.
Copy or Download Identifiers
Click 'Copy All' to copy the batch to your clipboard or download as a plain text file.
Inspect Existing UUID Strings
Paste any UUID into the Inspector panel to decode its version, variant, and embedded timestamp.
Practical Real-World Use Cases
Database Primary Keys
Developers generate UUIDv7 keys to maintain sequential B-tree indexing in PostgreSQL or MySQL.
Distributed Tracing Tokens
Developers create UUIDv4 correlation IDs for microservice request headers and tracing logs.
API Session & Auth Tokens
Developers generate random, non-colliding session IDs and temporary auth tokens.
Test Fixture & Mock Data Generation
Developers populate seed data scripts and test mocks with valid unique identifiers.
Frequently Asked Questions
- What is the difference between UUIDv4 and UUIDv7?
- UUIDv4 relies on 122 bits of random entropy, while UUIDv7 embeds a 48-bit Unix timestamp at the front followed by random bits for time-ordered database sorting.
- Are generated UUIDs truly random and secure?
- Yes. All UUIDs are generated using the browser's cryptographically secure Web Crypto API (crypto.getRandomValues).
- Are generated UUIDs stored or sent to any server?
- No. UUID generation occurs entirely inside local browser memory with No network requests, tracking, or remote persistence.
- Can I inspect the timestamp of a UUIDv7?
- Yes. Pasting a UUIDv7 into the Inspector panel extracts the embedded 48-bit timestamp and displays the exact creation date in ISO format.
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