Random String

Random String generates strings of a chosen length over a character set you select, with four options: letters and digits, letters only, digits only, and a punctuation-inclusive set. It is the workhorse for filling fields in test data and for producing throwaway identifiers.

Length runs up to two hundred and fifty-six characters and up to a hundred strings can be produced at once, which covers most fixture needs in a single pass. Output is one string per line, so it pastes cleanly into a file, a spreadsheet column or a list of test cases.

Two properties are worth understanding before you rely on the result. The punctuation option is not the full range of printable ASCII — it covers letters, digits and a set of punctuation marks, which is what you want for a field that has to accept ordinary input and not what you want if the test is specifically about unusual characters. And the underlying randomness is the ordinary pseudo-random generator rather than the cryptographic one, so treat generated strings as sample data rather than as secrets.

The generator produces output and nothing more. There is no option to exclude look-alike characters such as the digit one against a lowercase l, which is the usual requirement when strings will be read from a screen or typed by hand, and no way to supply a custom alphabet or a character-class pattern of your own — the four sets are the whole menu. No prefix, suffix, separator or format template can be applied, so a value that has to be shaped like an identifier must be assembled afterwards. Uniqueness is not checked or enforced either: each string is drawn independently, so a batch can contain duplicates, and nothing in the output tells you whether it does.