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Cryptographically secure passwords, passphrases, PINs, hex, API keys and custom strings with an entropy strength meter and bulk generation.
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Random String Generator creates random strings of any length from the character sets you choose, letters, numbers, symbols, using the browser's cryptographically secure randomness. It's a flexible source of tokens, keys, codes, and test data.
Security comes from length, character-set size, and genuine randomness. Because the values are drawn from the Web Crypto API rather than a predictable source, and never leave your device, they're suitable for real secrets and API keys when you make them long enough, 24–32 characters from a broad set is a sensible floor for security uses.
Pick the right tool for the job: a random string is fully customisable and ideal for tokens, coupon-style codes, and test fixtures, while a UUID is a standardised 128-bit identifier better suited as a database key or globally-unique ID. They solve different problems.
Generation runs in your browser with nothing transmitted, and you can produce as many as you need for free. For human-typed codes, choose simpler character sets to avoid confusing characters; for machine secrets, maximise length and variety.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Text Tools |
Set the length
Choose the character sets to include
A random string is generated instantly
Copy it, or generate another
Generates random strings of a length you choose
Select which character sets to include, letters, numbers, symbols
Uses the browser's secure randomness
One-click copy, generate fresh values on demand
Runs in your browser, generated values never leave your device
Free, with no signup and no character limit
Creating random tokens, API keys, or test data during development
Generating unique identifiers or coupon-style codes
Producing random secrets for configuration
Seeding test fixtures with varied random values
For security tokens, favour length (24–32+ chars) and a full character set over short complex strings
For codes people will read or type, avoid symbol-heavy sets and easily-confused characters
Need a standardised unique ID instead? Use the UUID Generator
Common questions about this tool, its workflow, and what to expect before you use it.
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Cryptographically secure passwords, passphrases, PINs, hex, API keys and custom strings with an entropy strength meter and bulk generation.
Use Random String Generator free →Live tool (iframe)
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