Why Does Base64 End With ==?

What is base64 padding?


= is the padding char.

It is used to pad the string to a multiple of four.

You can remove them from the final result without any issues, as a result a lot of times you see base64 encoded characters without padding.

Due to the format, you will only see one or two padding chars..

Why is base64 used?

Base64 encoding schemes are commonly used when there is a need to encode binary data that needs be stored and transferred over media that are designed to deal with textual data. … Base64 is used commonly in a number of applications including email via MIME, and storing complex data in XML.

How can you tell base64?

The length of a Base64-encoded string is always a multiple of 4. Only these characters are used by the encryption: “A” to “Z”, “a” to “z”, “0” to “9”, “+” and “/” The end of a string can be padded up to two times using the “=”-character (this character is allowed in the end only)

Is a valid base64 character?

The Base64 Alphabet contains 64 basic ASCII characters which are used to encode data. … Characters of the Base64 alphabet can be grouped into four groups: Uppercase letters (indices 0-25): ABCDEFGHIJKLMNOPQRSTUVWXYZ. Lowercase letters (indices 26-51): abcdefghijklmnopqrstuvwxyz.

Is base64 lossless?

Base64 is a lossless conversion (and it even needs a 33% space more). In math terms, the Base64 function is a bijection. Note how HTTP basic access authentication use this encoding for the username and the password. … You can find more details on Base64 also on Wikipedia.

Is base64 smaller than binary?

It will be bigger in base64. Base64 uses 6 bits per byte to encode data, whereas binary uses 8 bits per byte. Also, there is a little padding overhead with Base64. … That means that the encoded image will be around 25% larger, plus constant overhead for the padding.

How does base64 look like?

In programming, Base64 is a group of binary-to-text encoding schemes that represent binary data (more specifically a sequence of 8-bit bytes) in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.

What encoding ends with ==?

Base64A Base64 ends with either = or == or any of the accepted Base64 digit [A-Za-z0-9+-]. The = is a padding that indicates the number of actual bytes of data in the last three bytes.

Is base64 always same?

The short answer is yes, unique binary/hex values will always encode to a unique base64 encoded string. BUT, multiple base64 encoded strings may represent a single binary/hex value. … A single hex byte is represented by 8 bits while a single base64 digit is represented by 6 bits.

How do I decode base64?

How to decode Base64 online using this decoder toolPaste your string in the “Base64” field.Select the algorithm standard (if you do not know, leave it as it is, as the decoder will automatically detect it).Enable the strict decoding mode if you want to make sure that your Base64 string contains only valid characters.More items…•

Is base64 secure?

Base64 is a commonly used encoding scheme originally designed as a way to represent binary data in an ASCII text format. Like almost every aspect of computer technology today, base64 if not used properly, can result is increased security risk.

How does base64 decode work?

How it works. Base64 encoding takes the original binary data and operates on it by dividing it into tokens of three bytes. A byte consists of eight bits, so Base64 takes 24bits in total. These 3 bytes are then converted into four printable characters from the ASCII standard.

What characters are in base64?

Put simply, base64 encoded data is a string of character that contains only a-z, A-Z, 0-9, + and / characters and is often used in situations when sending non-text information via a text only transmission protocol.