How to encode and decode Base64 in Java

Step-by-step Java guide to encode and decode Base64. Use the browser tool for quick testing, then integrate the snippet into your application.

Steps

  1. 1

    Open the base64 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
String encoded = Base64.getEncoder().encodeToString(text.getBytes());
String decoded = new String(Base64.getDecoder().decode(encoded));
Open Base64 Encoder Decoder

Other languages

Node.jsPythonGoJavaRuby

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Frequently Asked Questions

Is it safe to use the browser tool for encode and decode Base64?

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.