Have to deal with Base64 format? Then this site is made for you! Use our super handy online tool to decode or encode your data.

Base64 Decoding of "c2F2b3JpZXM="

For encoded binaries (like images, documents, etc.) use the file upload form a bit further down on this page.

Decode files from Base64 format

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About

Meet Base64 Decode and Encode, a simple online tool that does exactly what it says; decodes Base64 encoding and encodes into it quickly and easily. Base64 encode your data in a hassle-free way, or decode it into human-readable format.

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. This is to ensure that the data remains intact without modification during transport. Base64 is used commonly in a number of applications including email via MIME, and storing complex data in XML or JSON.

Advanced options
  • Character set: In case of textual data the encoding scheme does not contain their character set, so you have to specify which one was used during the encoding process. It is usually UTF-8, but can be any other; if you are not sure then play with the available options including the auto-detect one. This information is used to convert the decoded data into our website's character set, so all letters and symbols can be displayed properly. Note that this is irrelevant for files, since no web-safe conversions have to be applied to them.
  • Decode each line separately: The encoded data usually consist of continuous text, even newlines are converted into their base64 encoded forms. Prior decoding all non-encoded whitespaces are stripped from the input to take care of its integrity. This option is useful if you intended to decode multiple independent data entries separated with line breaks.
  • Live mode: When you turn on this option the entered data is decoded immediately with your browser's built-in JavaScript functions - without sending any information to our servers. Currently this mode supports only the UTF-8 character set.
Safe and secure

All communications with our servers are made through secure SSL encrypted connections (https). Uploaded files are deleted from our servers immediately after being processed, and the resulting downloadable file is deleted right after the first download attempt, or 15 minutes of inactivity. We do not keep or inspect the contents of the entered data or uploaded files in any way. Read our privacy policy below for more details.

Completely free

Our tool is free to use. From now you don't have to download any software for such tasks.

Details of the Base64 encoding

Base64 is a generic term for a number of similar encoding schemes that encode binary data by treating it numerically and translating it into a base 64 representation. The Base64 term originates from a specific MIME content transfer encoding.

Design

The particular choice of characters to make up the 64 characters required for base varies between implementations. The general rule is to choose a set of 64 characters that is both part of a subset common to most encodings, and also printable. This combination leaves the data unlikely to be modified in transit through systems, such as email, which were traditionally not 8-bit clean. For example, MIME's Base64 implementation uses A-Z, a-z, and 0-9 for the first 62 values, "+" and "/" for the last two. Other variations, usually derived from Base64, share this property but differ in the symbols chosen for the last two values; an example is the URL and file name safe (RFC 4648 / Base64URL) variant, which uses "-" and "_".

Example

A quote snippet from Thomas Hobbes's Leviathan:

"Man is distinguished, not only by his reason, but ..."

represented as an ASCII byte sequence is encoded in MIME's Base64 scheme as follows:

TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCAuLi4=

In the above quote the encoded value of Man is TWFu. Encoded in ASCII, M, a, n are stored as the bytes 77, 97, 110, which are 01001101, 01100001, 01101110 in base 2. These three bytes are joined together in a 24 bit buffer producing 010011010110000101101110. Packs of 6 bits (6 bits have a maximum of 64 different binary values) are converted into 4 numbers (24 = 4 * 6 bits) which are then converted to their corresponding values in Base64.

Text contentMan
ASCII7797110
Bit pattern010011010110000101101110
Index1922546
Base64-encodedTWFu

As this example illustrates, Base64 encoding converts 3 uncoded bytes (in this case, ASCII characters) into 4 encoded ASCII characters.
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