Yes. Strings are generated with the Web Crypto API (cryptographically secure). Everything runs locally in your browser.

Can I avoid confusing characters?

Yes. Toggle “Exclude similar” (l, I, 1, O, 0) and “Exclude ambiguous symbols”.

Can I use a custom character set?

Yes. Provide a custom set (it overrides the presets unless you tick “Also include presets”).

Yes. Add fixed text before/after each random string.

Generate cryptographically secure random strings locally — choose length, count, character sets, custom charset, and one-click copy or download.

Need a different utility?

Preview

Entropy: — Charset: —

Length: 16

Up to 256 chars

Count

How many to add to the list

a–z A–Z 0–9 Symbols (!@#...)

Require at least one from each selected set Exclude similar: l I 1 O 0 Exclude ambiguous symbols: { } [ ] ( ) / \ ' " ` ~ , ; : . < >

Custom charset Also include presets above

Exclude characters

Separator (list)

Default newline (\n)

Prefix

Suffix

Use longer strings (16–32+ characters) for better entropy.
For machine tokens, avoid confusing characters or add a prefix to indicate purpose.
All generation happens locally with crypto.getRandomValues.

Do you upload or store my strings?

No. Everything runs locally in your browser.

Why do I see “entropy”?

We estimate entropy from the size of your character set and chosen length to give a rough strength indicator.