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Base64 Decode

Decode Base64 encoded text back to its original form.

When to use this tool

Indispensable when debugging JWTs, inspecting HTTP payloads, or extracting data from JSON API responses. Commonly used to decode basic auth headers, certificate data, and embedded binary content from web applications.

How to use

Paste the Base64-encoded string into the input field. The decoded output will appear instantly. For binary content, you can download the decoded result as a file.

Output
Download Image 

								
								
								
							

						


						

							

								

									
Workflow chain

									
Continue with tools that fit this output and developer workflow.

								

								
							


							

								

								
							

						

					

				


				
				

		
How this works


					

				
How this works

				

											
The decoder maps each Base64 character back to six bits, then combines those bits into the original bytes.

											
Whitespace is usually ignored, but invalid characters or broken padding can make a Base64 string impossible to decode safely.

									

			

		
					

				
Examples

				

											

															
Decode text

							
							

								

									
Input

									
SGVsbG8gV29ybGQ=

								

								

									
Output

									
Hello World

								

							


															
This is the common output from encoding the phrase Hello World.

													

											

															
Decode JSON

							
							

								

									
Input

									
eyJ1c2VyIjoiamFuZSJ9

								

								

									
Output

									
{"user":"jane"}

								

							


															
After decoding, you can send the result to the JSON tools for formatting or validation.

													

									

			

		
					

				
Edge cases to know

				
    
											
  • Missing padding may still decode in some systems, but strict decoders can reject it.
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  • Base64URL replaces plus and slash with dash and underscore, so it may need a URL-safe decoder.
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  • Decoded binary data may not display as readable text.
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Privacy note

				
This free tool decodes normal text input in your browser. Treat decoded tokens, credentials, and certificates as sensitive data.