Igor Kromin |   Consultant. Coder. Blogger. Tinkerer. Gamer.

Base64 encoding is used in quite a few places and there are many online web sites that let you encode or decode Base64. I am not very comfortable using such sites for security and privacy reasons so I went looking for alternative solutions. Whether you're using Linux, Windows or macOS you can use built-in tools to both encode or decode Base64 data. So ditch any online sites and start using software that is installed locally on your computer. Here's how.

You will need to do all of this via the command line. Given you're already dealing with Base64 data I am going to assume you know how to bring that up on your operating system. Scroll down to the relevant section based on your OS below, also substitute your file names as appropriate.

I am going to use .txt for the decoded data file extension and .b64 for the Base64 encoded file extension.

 Encode a data file to Base64
base64 data.txt > data.b64

 Decode a Base64 file
base64 -d data.b64 > data.txt

 Encode a data file to Base64
certutil -encode data.txt tmp.b64 && findstr /v /c:- tmp.b64 > data.b64

 Decode a Base64 file
certutil -decode data.b64 data.txt

Note: encoding with the above command will leave a temporary file, tmp.b64, on your file system. If you do not wish to have that file present simply add this to the end of the command: && del tmp.b64

 Encode a data file to Base64
base64 -i data.txt -o data.b64

 Decode a Base64 file
base64 -D -i data.b64 -o data.txt


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