Random String

Random String

The Random String generator produces a random string with selectable length and character set. You can set the length and choose which characters to use, for example only letters, only digits, or a combination. The tool is useful for generating passwords, tokens, session IDs, or other cryptographic values. All calculations run locally in your browser.

How it works

The generator selects a random character from the chosen character set for each position of the string. As a concrete example: if you generate a 12-character string from uppercase and lowercase letters plus digits (62 possible characters), the number of possible combinations is 62 to the power of 12, approximately 3.2 x 10 to the power of 21. This is an enormous number that makes it practically impossible to guess the string. The generator uses cryptographically secure random numbers to ensure string quality. The character set defines the space from which each position is drawn independently.

What the tool can and cannot do

This tool generates random strings. It does not encrypt data, validate password strength against standard security criteria, or store generated strings. The random number generation depends on the operating system and in rare cases may rely on weak random values if the system randomness source is not sufficiently entropic. The generator cannot produce strings with special requirements like a minimum number of special characters or excluded look-alike characters unless the character set is correspondingly restricted.

Why local processing in the browser

All calculations happen directly in your browser. Your inputs and the generated string are never sent to a server, there is no upload and no server logs. You do not need to register or have an account. After the page loads, the generator also works offline because assets are cached in the browser. There is no attackable server and nothing is transmitted over the network.

Frequently asked questions