Random String Generator

What is a Random String Generator?

A random string generator is a tool that creates a sequence of characters that have no intelligible pattern. These strings are often used for security purposes, such as creating strong passwords, API keys, or unique identifiers.

Why Use a Random String Generator?

Using random strings for passwords greatly increases security. Humans are bad at being random; we tend to use patterns or familiar words that are easy to guess. A machine-generated random string avoids these biases.

100% Client-Side Generation

All string generation happens locally in your browser using JavaScript's random number generator. Your data never leaves your device, ensuring complete privacy and security.

100% Client-Side Generation

How to use the Random String Generator

1
Set the length of each string and how many strings you need.
2
Select the character types: uppercase letters, lowercase letters, numbers and symbols. Use only letters and digits when the string goes into a URL, file name or system that rejects special characters.
3
Press Generate. Every string is created in your browser from a cryptographically secure random source.
4
Copy a single string or all of them, then paste them into your configuration, test data or password manager.

Practical examples

API keys and secrets

A 32-character string of letters and digits has about 190 bits of entropy, more than enough for an API key, webhook secret or session signing key.

Test data and fixtures

Generate 50 unique order codes or usernames at once to fill a staging database or a spreadsheet for load testing.

Coupon and invite codes

Short uppercase codes such as 8 characters from A-Z and 0-9 are easy to type and still allow about 2.8 trillion combinations.

Temporary passwords

Create a one-time password for a new account or a Wi-Fi guest network and ask the user to change it after the first login.

Frequently asked questions

Are these strings really random?+

Yes. They are generated with crypto.getRandomValues, the browser API meant for security purposes, not with Math.random, whose output can be predicted.

How long should a random string be?+

For secrets, aim for at least 128 bits of entropy: about 22 characters from letters and digits, or 21 characters when symbols are included. Short codes for humans can be shorter if they expire or are rate limited.

Can two generated strings be the same?+

It is possible in theory, but with 16 or more mixed characters the chance is so small that it can be ignored. For database keys, still keep a unique constraint.

Are the strings stored anywhere?+

No. Nothing is sent to a server or saved, so each string exists only on your screen until you copy it.