#Mime decoder online free#

Decoding Base64 without paddingĪfter decoding of four characters to three bytes without padding, four encoded characters may remain. A single = indicates that the four characters will decode to only two bytes, but = indicates that the four characters will decode to only a single byte. But when padding characters exist the logic changes.

Base64 Decoding Logic Decoding Base64 with paddingĭecoding Base64 text, four characters are converted to three bytes. This is one of the techniques employed by the MIME standard to send data other than plain text. One method of encoding this kind of binary data in a way that avoids such transmission problems is to send it as plain ASCII text in Base64 encoded format.

Since text-based systems like email interpret binary data as a wide range of characters, as well as special command characters, much of the binary data that is transmitted to transfer media is misinterpreted by those systems and lost in the transmission process. In addition, Base64 is used to encode data that may be unsupported or damaged during transfer, storage, or output.īase64 Decoder Tool will help you convert any Base64 encoded data to binary text. So a new algorithm was developed to solve this problem - Base64.īase64 is most commonly used to encode binary data such as images, or sound files to embed into HTML, CSS, EML, and other text documents. For example, a mail server may discard the eighth bit when sending emails or they could only send text, but not images, videos, archives, etc. But when the eight-bit byte approved as standard many systems used old standards and did not support the new one. Some decades ago, seven-bit, six-bit, and three-bit bytes were used. The history of the Base64 algorithm started when, in the past, engineers argued over how many bits should be in a byte. The 64 characters represent the 64 place-values for the base varies between implementations. Initially, the algorithm was named “printable encoding” and only in June 1992, RFC 1341 defines it as “Base64”. Other variations share this property but differ in the symbols chosen for the last two values an example is UTF-7. For example, MIME's Base64 implementation uses A–Z, a–z, and 0–9 for the first 62 values. This combination leaves the data unlikely to be modified in transit through information systems, such as email, that were traditionally not 8-bit clean. The general strategy is to choose 64 characters that are common to most encodings and that are also printable. The set of 64 characters represent the 64 place-values for the base varies between implementations. Base64 is particularly prevalent on the World Wide Web where its uses include the ability to embed image files or other binary assets inside textual assets such as HTML and CSS files. Three 8-bit bytes (i.e., a total of 24 bits) can, therefore, be represented by four 6-bit Base64 digits.Ĭommon to all binary-to-text encoding schemes, Base64 is designed to carry data stored in binary formats across channels that only reliably support text content. Each Base64 digit represents exactly 6 bits of data. The term Base64 originates from a specific MIME content transfer encoding. In computer science, Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. Due to this algorithm, even Chinese characters, emojis, and images can be converted into a “readable” string. Just type or past any Base64 encoded data in the input textarea above, and the tool will decode the input.īase64 is an encoding algorithm that allows converting any characters into an alphabet which consists of Latin letters, digits, plus, and slash.

#Mime decoder online free#

Use this online free Base64 Decoder tool to decode any Base64 encoded data back to binary data.