Random String Generator — Generate Secure Strings Online
Generate random strings of any length using alphanumeric characters, symbols, or custom character sets. Ideal for passwords, API keys, tokens, and test data generation.
Key Features
Cryptographically secure entropy using window.crypto CSPRNG
Selectable character sets: uppercase, lowercase, digits, and special symbols
Custom character set inclusion and exclusion (e.g. avoid ambiguous characters like 0, O, 1, l)
Bulk generation mode for generating multiple API keys or test tokens simultaneously
How to Use
Specify the desired length of the generated string.
Select the character types to include (letters, numbers, symbols).
Optionally exclude ambiguous characters or provide a custom set.
Click "Generate Random String" to compute the output.
Copy the generated strings for passwords, tokens, or mock data.
Example
Sample input
Length: 16, charset: A-Za-z0-9
Sample output
k7Pm2xQ9vL4nR8wT
Edge Cases
Exclude ambiguous characters (0/O, l/1)
Cryptographic vs pseudo-random source
Zero length request
Frequently Asked Questions
Are the generated strings cryptographically secure for passwords?
Yes. Strings are generated using the browser’s native cryptographic random number generator (crypto.getRandomValues), providing unpredictable entropy suitable for passwords and API secrets.
Can I exclude confusing characters like uppercase I and lowercase l?
Yes. Enable the "Exclude ambiguous characters" option to omit visually similar characters like 1, l, I, 0, and O.
Are generated strings logged or stored anywhere?
Generation runs on our server over HTTPS. The generated value is returned to your browser and is not stored or logged.
Privacy notice: when you run this tool, your input is sent over HTTPS to our server, processed in memory and returned. It is not stored or logged. Avoid pasting live secrets such as private keys or passwords.