Random String Generator
Random String Generator builds random strings of any length from the character sets you choose — lowercase, uppercase, numbers and symbols. Generate one string or a batch at once.
Strings are produced with your browser's cryptographically secure random number generator, making them suitable for tokens, nonces, test fixtures and identifiers. Nothing leaves your device.
How to use Random String Generator
- 1
Set length and count
Choose how many characters each string should have and how many strings to generate.
- 2
Pick character sets
Toggle lowercase, uppercase, numbers and symbols to control the alphabet.
- 3
Generate and copy
Click Generate, then copy a single string or the whole batch.
What are random strings used for?
Random strings appear throughout software: API keys and access tokens, password reset and email-verification tokens, CSRF nonces, session identifiers, file names for uploads, and unique slugs. Anywhere you need an unguessable value, a random string fits.
They are also handy for testing — generating dummy reference codes, coupon codes, or placeholder identifiers when seeding a database or filling a form.
Random strings vs UUIDs
A UUID is a fixed 128-bit identifier in a standard format, ideal when you need interoperability and a guaranteed structure. A random string is more flexible: you control the exact length and alphabet, which is useful for short codes, human-readable tokens, or matching a system's specific format requirements.
If you need a standardized unique identifier, reach for the UUID Generator. If you need a custom-length token from a specific character set, this tool is the better fit.
Frequently asked questions
- Are the strings cryptographically secure?
- Yes. Characters are chosen with the Web Crypto API using unbiased sampling, so the output is suitable for tokens and other security-sensitive values.
- What is the maximum length?
- You can generate strings up to 512 characters long, in batches of up to 100.
- Can I exclude symbols?
- Yes. Turn off any character set you don't want. At least one set must stay enabled.
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