Base64 Decode: How It Works With Examples In Every Language [2026]
Blog post from Keploy
Base64 is a binary-to-text encoding scheme that converts binary data into an ASCII string format using a set of 64 characters, ensuring data integrity during transmission over text-based media like email and HTTP. It maps each Base64 character to a 6-bit value to encode data and uses padding, represented by the "=" character, to handle binary data not divisible by 6 bits. Base64 encoding is extensively used in email attachments, web APIs, and data storage, serving as a reliable method for representing binary data in text form, although it is not a secure method for transmitting sensitive information since it can be easily decoded. Various programming languages and tools, such as Python, JavaScript, and Java, provide built-in support for Base64 encoding and decoding, and command-line tools are also available for debugging purposes. Base64 is crucial in modern computing environments, facilitating the handling of diverse data formats, with applications in encoding API payloads, embedding images in HTML or CSS, and storing binary data in JSON or XML.
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