UUID Generator

Generate UUID v4 identifiers using cryptographically secure randomness. Single UUID or bulk up to 1,000.

🔧

UUID Generator is coming soon. In the meantime, try the JSON → CSV converter, which has flattening built in.

How it works

crypto.randomUUID() in the browser

Uses the browser's built-in cryptographically secure random number generator. Each UUID is 122 random bits, making collisions effectively impossible.

Example

Generating a UUID for a database primary key

Input

// JavaScript
crypto.randomUUID()

Output

"550e8400-e29b-41d4-a716-446655440000"

Frequently asked questions

Is UUID v4 safe to use as a database primary key?

It works but has trade-offs. Random ordering causes B-tree index fragmentation at scale. For write-heavy tables, prefer UUID v7 or ULID (time-ordered). For most applications, UUID v4 is fine.

Related Tools

TOOL

Hash GeneratorGenerate SHA-1, SHA-256, SHA-384, or SHA-512 hashes from any text. Uses the Web Crypto API — nothing leaves your browser.

TOOL

Timestamp ConverterConvert Unix timestamps to human-readable dates, or any date string to a Unix timestamp. Live current time display.

TOOL

Base64Decode base64 strings to text or JSON, or encode any text to base64. Handles URL-safe base64 and missing padding.

TOOL

URL EncodePercent-encode URLs and query parameters, or decode encoded strings back to readable text. Updates as you type.

All conversions run in your browser — nothing is uploaded.

Browse all 26 converters →