Random String
Random String handles one task — generate random strings — without an account or a download. Values come from the browser's built-in cryptographic random generator (Web Crypto), not a predictable pseudo-random function. It is used most by teams generating identifiers for test data. Character sets and length are adjustable to meet a specific policy. It stays free with unlimited use, and there is no watermark on anything it produces.
Key features
- Character sets and length are adjustable to meet a specific policy.
- Generated values exist only in your tab and are never transmitted or stored.
- Works on desktop, tablet and phone — no separate app to install.
- Built to do one job properly rather than twenty jobs badly.
How to use Random String
- Set your requirements: Choose the length and which character types to include.
- Generate: Press the button — a fresh cryptographically random value appears immediately.
- Store it safely: Copy it into a password manager now. Nothing is kept once you leave the page.
Frequently asked questions
- Could anyone else see the value? — No. It is created in your tab and never sent anywhere. Nothing is logged or stored.
- Is the output from Random String genuinely random? — Yes. Random String uses the browser's Web Crypto generator, which is designed for cryptographic use — not the predictable Math.random.
- Can I recover a value I lost? — No, and deliberately so: nothing is retained. Copy it into your password manager before leaving.
- Can the same value be generated twice? — At the lengths used here the chance is vanishingly small — far below anything that matters in practice.