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Base64 Decoder

Decode Base64 encoded text back to its original format instantly. Perfect for decoding API responses, email content, and data URLs. Supports UTF-8. 


                Your decoded result will appear here...
            

        




    
    

    
        

            

                💡 How to Use This Tool
            

            

                Decode any Base64 text back to its original format in seconds. Follow these simple steps:
            

            

                

                    
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Paste Base64 Text

                        
Enter or paste the Base64 encoded text you want to decode.

                    

                

                

                    
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Click Decode

                        
Press the "Decode Base64" button to convert it back.

                    

                

                

                    
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View Result

                        
Your original text appears instantly in the result area.

                    

                

                

                    
4

                    

                        
Copy Result

                        
Click "Copy" to copy the decoded text to your clipboard.

                    

                

            

        


        
        


        
        

            

                📖 About Base64 Decoder
            

            

                
What is Base64 Decoding?


Base64 decoding is the process of converting Base64 encoded text back to its original binary or text form. It reverses the encoding process that transforms binary data into printable ASCII characters.


How Base64 Decoding Works


Base64 decoding takes groups of 4 ASCII characters and converts them back into 3 bytes (24 bits) of original data. Each character represents 6 bits, and padding characters (=) indicate incomplete byte groups.


Common Use Cases


    

  • API Responses: Decode binary data received from web services
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  • Email Content: Read MIME-encoded email attachments and content
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  • Data URLs: Extract embedded images and files from HTML/CSS
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  • Authentication Tokens: Decode JWT payloads and auth credentials
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  • Configuration: Read encoded values from config files
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  • Debugging: Inspect Base64 data during development
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Privacy & Security


This tool runs entirely in your browser using JavaScript. Your text is never sent to any server—all decoding happens locally on your device. Your data stays completely private.


Technical Details


    

  • Output is approximately 25% smaller than input (reverses the 33% size increase)
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  • Handles padding characters (=) automatically
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  • Validates input for proper Base64 format
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  • Fully supports UTF-8 text and special characters
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        ❓ Frequently Asked Questions
    

    
    

                    

                
                

                    

                        Yes! All decoding happens locally in your browser using JavaScript. Your text never leaves your device and is not sent to any server.
                    

                

            

                    

                
                

                    

                        Base64 decoding is used to convert encoded data back to its original format. Common uses include reading API responses, decoding email attachments, extracting embedded images from data URLs, and inspecting JWT tokens.
                    

                

            

                    

                
                

                    

                        The decoder will show an error message if the input is not valid Base64. Valid Base64 contains only A-Z, a-z, 0-9, +, /, and = (for padding). Make sure your input is properly formatted.
                    

                

            

                    

                
                

                    

                        Yes! This decoder properly handles UTF-8 encoded content, including special characters, emojis, and non-Latin scripts that were encoded using proper UTF-8 to Base64 conversion.