Random String Generator
Generate a random alphanumeric string of any length. Optionally include symbols or digits. Free, no signup.
How to use this tool
- Set your desired string length.
- Toggle which character groups to include.
- Click Calculate to generate a new string.
- Click again to re-roll without changing settings.
Generate random strings with a fully customisable character pool. Choose uppercase, lowercase, digits, and symbols to suit your use case — API keys, test data, tokens, and more.
How it works
The Random String Generator creates a string of random characters at whatever length you specify. You control which character sets are included: uppercase letters (A-Z), lowercase letters (a-z), digits (0-9), and symbols such as !@#$. Enabling more character sets increases the entropy of the output, making it harder to guess or brute-force.
Common uses include generating API keys, session tokens, temporary passwords, unique file names, database record IDs, and test fixtures. The tool runs in your browser and does not send results to any server, making it safe for generating sensitive tokens.
For a random password specifically, the Secure Password Generator on this site guarantees character-class coverage. Use this tool when you need a raw random string of a precise format -- for example, an alphanumeric-only token without symbols, or a fixed-length string for a database schema requirement.
Worked example
Generating a 32-character alphanumeric API key
- Set Length to 32.
- Enable Include uppercase letters.
- Enable Include lowercase letters.
- Enable Include digits.
- Leave Include symbols off.
- Click Generate and copy the result.
A 32-character token such as 'aB3kR9mXvQ2zLp7wNcY1sT6jUdFgEo4h' suitable for use as an API key.
Common mistakes to avoid
- Enabling only one character set (e.g. digits only) and wondering why the output looks weak -- combine at least two sets for practical tokens.
- Generating a string with symbols and then pasting it into a system that does not accept special characters, causing an error.
- Using a very short length (under 12 characters) for a security-sensitive token where longer strings are strongly recommended.
Key terms
- Entropy
- A measure of randomness or unpredictability in a string; more possible characters per position means higher entropy.
- Character set
- The collection of characters that can appear in the output (letters, digits, symbols).
- Token
- A random string used as a temporary credential, identifier, or key in software systems.
Frequently asked questions
- What character sets are available?
- Uppercase A–Z, lowercase a–z, digits 0–9, and a symbols set. At least one group is always active.
- Is this suitable for passwords?
- For strong passwords use the Secure Password Generator which guarantees representation from each selected group.