Using base64 to decode a file The -d or –decode flag tells base64 it’s decoding data (on a Mac -d is a debugging flag, so it’s -D and –decode instead).įor instance to decode base64 encoded text file “encodedfile.txt”, the command would be: $ base64 -d encodedfile.txt This command will decode the base64 encoded text file and print the original text on the standard output as shown in the following screenshot.īase64 is the simple command line Windows used to encode and decode files in the “Base64” format. The command line base64 tool can help with this, either decoding a file or standard input. As with encoding files, the output will be a very long string of the original file. To decode a file with contents that are base64 encoded, you simply provide the path of the file with the -decode flag. Provided your encoding was not corrupted the output should be your original string. base64 -decode file command lineĮcho -n 'bXktc3RyaW5n' | base64 -decode. For example, invalid zlib-compressed and base 64-encoded strings will return an empty output. Returns an empty result if decompression or decoding failed. Returns a string that represents the original string. The Base64 term originates from a specific MIME content transfer encoding.
If your string contains invalid characters or cannot pass the validation, use the Base64 Repair Tool.īy default, upon encountering a non white space character which does not belong to the base64 set, or discovering the input file is incorrectly padded to a multiple of four characters, base64 issues an error message and terminates processing with exit status 1.īase64 is a generic term for a number of similar encoding schemes that encode binary data by treating it numerically and translating it into a base 64 representation. If you want to decode a string, use the Base64 decoder. Validate Base64 If you do not know which standard to choose, check the standard detector.
The docs don't make this explicitly clear, but if you omit `$strict` or set it to `false` then invalid characters in the encoded input will be silently. That motivates a divide and conquer 4 years ago. Base64: invalid input The base64-decoding function is a homomorphism between modulo 4 and modulo 3-length segmented strings.
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