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.
Last updated August 26, 2026
Steps
- 1
Open the password generator tool and generate or process your value in the browser.
- 2
Copy the output — nothing is sent to a server; all processing is client-side.
- 3
Store secrets in environment variables or a secrets manager, never in source code.
- 4
Integrate the Java snippet below into your application.
- 5
Test end-to-end before deploying to production.
Code Example
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())));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.
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