![]() The base64 implementation shown above covers the core concept. So, the space overhead is not a deal-breaker for sending files over web. The encoding size overhead is not that significant (typically around 2-5%) between the compressed original and compressed encoded files. API endpoints which have JSON payloads sometimes take the file as base64 in the JSON payload.ĭata sent over the wire, between the server and the browser is usually compressed with algorithms like gzip, brotli etc. 1 you have to Compress image first then after convert into base64. E-Mail attachments are sent out as base64 encoded strings.īase64 is useful to send over any kind of data over the wire as a plain text string. Why is base64 used then?īase64 is used when there was a need to encode binary data so that it can be stored and transferred over mediums that primarily designed to deal with ASCII text. So, 33 % more storage is used than normal. To send three bytes of information ( cat for example) we would have to actually send out four bytes in base64 ( Y2F0). This is used to reduce the size of the file. Instead of one character representing 256 (2^8) as it does in normal encoding, each character represents only 64 (2^6) states in base64. In Tosca you can encode contents of resources in Base64 and add the result as value to an XML element. (Since 011000 in decimal is 24 and 24 maps to Y and so on)Ĭat being 24 bits was no coincidence ) If the data is not 24 bits, then = is used as padding to make it into a multiple of 24 bits. Let’s go back to our cat example, now that the basics are out of the way. ![]() The base64 RFC has a handy table for all these states Value Encoding Value Encoding Value Encoding Value Encoding That is 26 capitals + 26 smalls + 9 digits + 1 + + 1 /, that’s 63 states. In base64, this is A-Z, a-z, 0-9, +, / and = (for padding). Six bits can represent 64 states (2 ^ 6). Base64 encoding breaks binary data into 6-bit segments of 3 full bytes and represents those as printable characters in ASCII standard. Leaving out these null values reduces our JSON data size to 166.8kB or 92.1 of the original data size. In our mock data, we set 50 of the phone numbers, and 30 of the email addresses, as empty. So, cat is essentially 3 bytes.īut for base64, the rules are different. This leaves the initialization of empty values to each JSON processing library and reduces the JSON data size. Let’s take an example of a simple string cat ![]() All base 64 characters are between A-Z, a-z & 0-9. Base64 Encoding - combine resources directly into HTML or CSS, use dataURI for external resources with Base64 encoding. Why is a base 64 encoded file 33% larger than the original?īase 64 is a binary to text encoding scheme which represents binary data in ASCII string format as six, four bit strings.
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