UUID Generator
Generate random UUID v4 strings instantly.
About the UUID Generator
Generate random UUID v4 strings for development and testing. Cryptographically random, RFC 4122 compliant.
Why client-side?
Every byte you paste, type, or upload here is processed entirely inside your browser. Nothing is sent to a server, logged, or stored. That means it's safe to use this tool on production secrets, customer data, internal logs, and any input you would not paste into a hosted SaaS formatter.
Related tools
- Website SEO Checker Extract and analyze SEO meta tags from any URL. Check title tags, meta descriptions, Open Graph, and more.
- Private JSON Formatter & Validator - Fast, Client-Side Data Tool Free JSON formatter and validator that runs entirely in your browser. Beautify, validate, and pretty-print JSON with no uploads, no sign-up, and no data leaving your device.
- Base64 Encoder/Decoder Encode and decode Base64 strings in your browser. Handles UTF-8, emoji, and binary safely via TextEncoder. Use for data URIs, JWT inspection, and Basic Auth headers.
- Markdown Previewer Write and preview Markdown in real-time with a side-by-side editor. Supports headings, lists, code blocks, and more.
Frequently Asked Questions
- What is a UUID?
- A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as a 36-character string (e.g., 550e8400-e29b-41d4-a716-446655440000). UUID v4 uses random generation.
- Are generated UUIDs truly unique?
- UUID v4 uses cryptographically secure random numbers. The probability of generating a duplicate is astronomically low (about 1 in 2^122).
- Can I generate multiple UUIDs at once?
- Yes. You can generate multiple UUID v4 strings at once for batch use in development and testing.