Base64 Decoder
Decode any Base64 string back to original text instantly. Perfect for debugging APIs and decoding encoded data.
Instant Base64 to text conversion
Automatic padding correction
Error detection for invalid input
100% client-side processing
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How to Use the Base64 Decoder
Our base64 decoder makes Base64 encoding and decoding simple:
- 1.Paste Base64 string in the input area
- 2.Click "Decode" to convert back to readable text
- 3.Copy the result or swap input/output
- 4.Check for errors if decoding fails
Common Use Cases
- •Decoding API responses
- •Reading JWT token payloads
- •Debugging encoded data
- •Extracting embedded content
Why Use Our Base64 Decoder?
- •100% Private: All processing happens in your browser
- •No Registration: Use immediately without creating an account
- •No Limits: Process as much data as you need
- •Works Offline: Once loaded, works without internet
- •Unicode Support: Full emoji and international character support
Technical Details
Base64 encoding uses a 64-character alphabet to represent binary data as ASCII text. Every 3 bytes of input become 4 characters of output (~33% size increase).
Our tool uses the browser's native btoa() and atob() functions for fast, reliable conversion. Unicode text is first converted to UTF-8.