#Decode base64 mac free#

Now use the Base64 alphabet (see above image) to convert each decimal number to its Base64 representation:Īnd we're done.Convert each group to a decimal number between 0 to 63:.Let's convert my name 'Akshay' to its Base64 equivalent string. Sounds confusing? Don't worry, the following example should make it pretty clear.

If there're insufficient bits in the final group, you can use = or = as padding.

Convert this decimal number to the equivalent Base64 character using the Base64 alphabet.

It cannot be greater than 64 as there are only 6 bits in each group.

Convert each group to a decimal number from 0-63.

Divide the bits into groups of 6 bits each.

Convert the text to its binary representation.

Here's the simple algorithm that converts some text into Base64. Let's take a deeper look into this algorithm in the next section. Then transfer the Base64 encoded string, and then decode it back to the original file content on the receiving side. First, get the file's bytes and encode them as Base64. You can also transfer files as text, using Base64 encoding. Base64 can also be used for passing data in URLs when that data includes non-URL friendly characters.īase encoding is also used in many applications simply because it makes it possible to manipulate objects with text editors. This ensures data remains unchanged during transport. Here it is necessary to encode the data to avoid characters like '' being interpreted as tags.Īnother common use case is when we have to store or transmit some binary data over the network that's supposed to handle text, or US-ASCII data. A more modern example is the use of Base64 encoding to embed image data directly in HTML source code. Historically it has been used to encode binary data in email messages where the email server might modify line-endings. Did you know you can embed the image data directly into the HTML without linking to the external image file? Data URLs let you do this, and they use Base64 encoded text to embed files inline. You must have included an image in your HTML document using the tag. Hopefully it should be clear by the end of this post.) Why Base64? (If that last paragraph totally went over your head, don't worry. So 24 bits, or 3 bytes, can be represented using four 6-bit Base64 digits. There are 8 bits in a byte, and the closest common multiple of 8 and 6 is 24. Every Base64 digit represents 6 bits of data. The Base64 AlphabetĪs there are only 64 characters available to encode into, we can represent them using only 6 bits, because 2^6 = 64.

In its essence, Base64 encoding uses a specific, reduced set of characters to encode binary data, to prevent against data corruption. We are only changing the representation of the data, i.e. Given Base64 encoded data, it's very easy to convert it back (decode) to the original text. It's important to remember that we are not encrypting the text here. Requires import .binary.Here's what the text 'Ruby on Rails' looks like when Base64 encoded: UnVieSBvbiBSYWlscw=. 8.GetString(64String(base64EncodedData)) You should use Base64 whenever you intend to transmit binary data in a textual format. When and why would you use Base64 encoding? It also uses a = character at the end of a string to signify whether the last character is a single or double byte. MIME Base64 encoding is the most common, and is based on the RFC 1420 specification. Encoding data in Base64 results in it taking up roughly 33% more space than the original data. Other examples of Base64 encoding are Radix-64 and YUI's Y64.

It is used to transmit attachments via email over the Simple Mail Transfer Protocol (SMTP). MIME, which stands for Multi-Purpose Internet Mail Extensions, is the most common that is seen today. The term Base 64 is generic, and there are many implementations. RGFuJ3MgVG9vbHMgYXJlIGNvb2wh What is Base64 encoding? The MIME implementation uses the characters A-Z, a-z, and 0-9 for the initial 62 values that it can use to encode data. This is done via the MIME implementation of Base64. An example of this is an attachment in an email. To allow binary data to be transmitted with textual data it must be encoded.

#Decode base64 mac free#

Use this free tool to turn binary data into text (encode) or text into binary (decode).