How do I encode or decode Base64 online?

Encoding and decoding Base64 online is simple with this free tool.

To Encode Text to Base64:

1. Select the "Encode" tab
2. Enter your plain text in the input field
3. The Base64-encoded result appears instantly in the output field
4. Click the copy button to copy the encoded string

To Decode Base64 to Text:

1. Select the "Decode" tab
2. Paste your Base64 string in the input field
3. The decoded plain text appears instantly in the output field
4. Click the copy button to copy the decoded text

Features of This Tool:

• Real-time encoding/decoding as you type
• Automatic error detection for invalid Base64
• Character and byte count for both input and output
• Copy-to-clipboard functionality
• All processing happens in your browser (no data sent to servers)
• Handles UTF-8 text encoding properly

Tips:

• Valid Base64 only contains A-Z, a-z, 0-9, +, /, and = (padding)
• Whitespace in Base64 strings is automatically ignored
• The decoder will show an error for invalid Base64 strings
• UTF-8 characters are properly handled during encoding

Use Cases:

• Debug API requests that use Base64
• Encode credentials for Basic Authentication
• Create data URIs for images
• Decode Base64-encoded data from logs or API responses
• Test Base64 encoding in development