How the Base64 Encoder and Decoder Works

Our Base64 Encoder and Decoder allows you to convert text to and from Base64 format securely in your browser.

Browser-Based Conversion

Our tool uses standard browser APIs for the conversion process:

1. Encoding: To convert text to Base64, we use the btoa() method. If the text contains non-ASCII characters, we use a custom encoding approach to ensure UTF-8 compatibility.
2. Decoding: To convert Base64 back to text, we use the atob() method.

UTF-8 Support

Standard Base64 encoding often struggles with special characters (like emojis or non-English characters). We handle this by using a robust method:

• Step 1: Encode the input string as a UTF-8 byte array using TextEncoder.
• Step 2: Convert each byte into its corresponding character representation.
• Step 3: Use btoa() to create the final Base64 string.

This ensures that any character you enter is preserved correctly across the conversion.

Privacy First

Your data is handled entirely on your computer:

• No Data Transmission: The text you enter and the resulting Base64 output never leave your browser.
• Safe for Secrets: It is secure to use this tool for encoding API keys, tokens, or credentials, as they are never transmitted over the internet.
• Zero Retention: Once you refresh or close the page, your data is gone.

Verification

You can verify that this tool is 100% private by checking your browser's Network tab (F12). No requests to any server are made when you click "Encode" or "Decode".