🔒 100% Private & Client-Side

Generate a fully random string in one click

Flassword creates random, configurable strings instantly — right in your browser. Ideal for API keys, tokens, and test data.

Generating...
Strong 0 bits of entropy
String length From short codes to long tokens
24
Uppercase letters A-Z
Lowercase letters a-z
Numbers 0-9
Symbols !@#$%^&*
Exclude ambiguous characters No l, 1, I, O, 0, o
Generated locally using your browser's cryptographic API — never stored, never transmitted.

Built the same way as our password generator

Fully configurable, cryptographically secure, and private by default.

Fully configurable

Toggle uppercase, lowercase, numbers, and symbols independently, from 4 to 128 characters.

Ambiguity-free option

Exclude look-alike characters like l, I, 1, O, and 0 for strings people need to type or read.

Cryptographically secure

Built on the Web Crypto API — the same secure randomness behind our password generator.

Frequently asked questions

Everything you might want to know about the random string generator.

Common uses include API keys, session tokens, temporary IDs, coupon or voucher codes, test data, and any placeholder value that needs to be unpredictable rather than memorable.

Characters like l, 1, I, O, and 0 can look identical in some fonts, which causes mistakes when a string has to be read aloud, typed manually, or copied from a printed page. Excluding them trades a small amount of theoretical entropy for fewer real-world transcription errors.

The underlying randomness is the same, but this tool is tuned for general-purpose strings: a wider length range up to 128 characters, symbols off by default since many systems don't accept them in keys or codes, and the option to exclude ambiguous characters.

The generation itself is cryptographically secure and happens entirely in your browser, with nothing transmitted or logged. That said, treat any generated secret the way you'd treat a password: store it in a password manager or secrets vault rather than in plain text.

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