How to generate a strong password in Java

Step-by-step Java guide to generate a strong password. Use the browser tool for quick testing, then integrate the snippet into your application.

Steps

  1. 1

    Open the password generator tool and generate or process your value in the browser.

  2. 2

    Copy the output — nothing is sent to a server; all processing is client-side.

  3. 3

    Store secrets in environment variables or a secrets manager, never in source code.

  4. 4

    Integrate the Java snippet below into your application.

  5. 5

    Test end-to-end before deploying to production.

Code Example

Java
SecureRandom random = new SecureRandom();
String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
StringBuilder sb = new StringBuilder(20);
for (int i = 0; i < 20; i++) sb.append(chars.charAt(random.nextInt(chars.length())));
Open Password Generator

Other languages

Node.jsPythonGoJavaRuby

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Frequently Asked Questions

Is it safe to use the browser tool for generate a strong password?

Yes. All computation uses Web Crypto in your browser. No keys or tokens are transmitted to any server.

Can I use this Java code in production?

Yes, with proper secret storage. Replace placeholder values with environment variables and follow security best practices.