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Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 to text. Supports Unicode characters.

Real-time mode
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What is Base64?
 
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters. It's commonly used to encode data for transmission over media designed to handle text, such as email or URLs. Base64 uses 64 characters (A-Z, a-z, 0-9, +, /) to represent data.
 
 
 
Why use this Base64 Encoder?
 
     
  • Full Unicode Support — Properly handles Chinese characters, emoji, and all UTF-8 text.
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  • Real-time Encoding — See results instantly as you type.
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  • Large Input Support — Handles large texts with automatic performance protection.
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  • Privacy First — All encoding/decoding happens locally in your browser.
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How to use
 
     
  1. Select "Encode" or "Decode" mode from the dropdown.
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  2. Enter your text or Base64 string in the input field.
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  3. The result appears instantly in the output area.
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  4. Click "Copy Result" to copy to clipboard.
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FAQ
 
 
 
Why do I get errors with regular Base64 tools?
 
Many online Base64 tools don't properly handle Unicode characters (like Chinese or emoji). This tool uses TextEncoder/TextDecoder to correctly process all UTF-8 characters.
 
 
 
Is my data sent to any server?
 
No. All encoding and decoding happens entirely in your browser using JavaScript. Your data never leaves your device.