Is the output cryptographically secure?

No — this tool uses Math.random(), which is not cryptographically secure. For security-sensitive use cases (tokens, API keys, session IDs), use a proper CSPRNG. For test data, passwords you type in yourself, placeholders, or IDs in non-security contexts, this output is fine.

What characters are included in each type?

Lowercase: a–z (26 characters). Uppercase: A–Z (26 characters). Digits: 0–9 (10 characters). Symbols: !@#$%^&*()-_=+[]{}|;:,.<>? (26 characters). Selecting multiple types pools all the selected characters into a single alphabet.

Can I generate a string with only digits?

Yes — deselect lowercase, uppercase, and symbols, leaving only digits checked. You'll get a numeric-only random string of the chosen length.

Does anything leave my browser?

Nothing. All generation is pure client-side JavaScript — no data is sent to any server.

RANDOM STRING GENERATOR

Generate random strings with any combination of lowercase, uppercase, digits, and symbols. Choose your length and count, copy and go.

Length: 16

4128

Count

Character types

a–z lowercaseA–Z uppercase0–9 digits!@#$ symbols

How to generate random strings

1
Use the length slider to set how many characters each string should have (4–128).
2
Choose how many strings you need: 1, 5, 10, 20, or 50.
3
Toggle the character types you want included: lowercase, uppercase, digits, and/or symbols.
4
Click Generate, then copy individual strings or use Copy all to grab the full list.

Questions

Is the output cryptographically secure?: No — this tool uses Math.random(), which is not cryptographically secure. For security-sensitive use cases (tokens, API keys, session IDs), use a proper CSPRNG. For test data, passwords you type in yourself, placeholders, or IDs in non-security contexts, this output is fine.
What characters are included in each type?: Lowercase: a–z (26 characters). Uppercase: A–Z (26 characters). Digits: 0–9 (10 characters). Symbols: !@#$%^&*()-_=+[]{}|;:,.<>? (26 characters). Selecting multiple types pools all the selected characters into a single alphabet.
Can I generate a string with only digits?: Yes — deselect lowercase, uppercase, and symbols, leaving only digits checked. You'll get a numeric-only random string of the chosen length.
Does anything leave my browser?: Nothing. All generation is pure client-side JavaScript — no data is sent to any server.