What is base64 and how to use it

Created on December 14, 2022 at 11:51 am

Category: Programming


Base64 is a way of encoding binary data, such as images, into ASCII text so that it can be easily transmitted over networks such as the internet. It is often used for sending and receiving files and other data over the internet, especially in email messages and web pages. To decode a base64-encoded string, you can use a variety of online tools or software programs, such as the open-source utility base64. Here’s an example of how you might use base64 to decode a string:

$ base64 --decode /path/to/encoded/file

Alternatively, you can use the base64 command-line utility in combination with the -D option to decode a base64-encoded string:

$ echo "encoded string" | base64 -D

In this example, “encoded string” is the base64-encoded string that you want to decode. The base64 utility will then output the decoded string to the console.

How to do base64 decode in python

To decode a base64-encoded string in Python, you can use the base64.b64decode() method. This method takes a single argument, which is the base64-encoded string that you want to decode, and returns the decoded string. Here is an example:

import base64

# The base64-encoded string that you want to decode
encoded_string = "SGVsbG8sIFdvcmxkIQ=="

# Decode the encoded string
decoded_string = base64.b64decode(encoded_string)

# Print the decoded string
print(decoded_string)

This code will print Hello, World! to the console. Note that the base64.b64decode() method expects the input to be a bytes object, so if you have a string object instead, you will need to encode it using the encode() method before passing it to the base64.b64decode() method. For example:

import base64

# The base64-encoded string that you want to decode
encoded_string = "SGVsbG8sIFdvcmxkIQ=="

# Decode the encoded string
decoded_string = base64.b64decode(encoded_string.encode())

# Print the decoded string
print(decoded_string)

This code will produce the same result as the previous example.

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