This online tool encodes, decodes, escapes or unescapes a number of text and data formats. It autodetects the format and encoding whenever data is pasted into the input field or if the automatic format is selected.

The actual encoding/decoding runs in the browser (in JavaScript) without any data being sent to the server. The following data formats and encodings are supported:

• Base64 – The Base64 encoding is used to transfer binary or text data as (7-bit) ASCII. It can also be used in data URI:s, encoding an image or similar directly as a link. The output uses the 64 characters A-Za-z0-9+/ for data, = for padding and optional whitespace. Since every 3 bytes of data are converted into 4 output characters, the Base64 format results in a 33% size increase.
• Hexadecimal & Base16 – The hexadecimal numeral system is frequently used in computing for encoding binary data as a hex dump, i.e. space-separated groups of 0-9a-f characters. This is sometimes referred to as Base16 encoding.
• JSON, JavaScript, Java, C, C++ & others – The Wikipedia article on string literals provides information about the character escape sequences and string quotation styles used in various programming languages.
• Quoted-printable – The quoted-printable encoding is used for converting 8-bit or UTF-8 text into printable (7-bit) ASCII. It is mostly used in email and other MIME applications. Since quoted-printable does not specify the character encoding, it is important to specify this correctly when encoding or decoding. This is sometimes added to message headers or inside a string prefix (in Q-encoding), e.g. =?iso-8859-1?Q?=.
• URL & WWW-form – URL or Percent encoding is used for transferring non-ASCII characters inside URLs and HTTP POST form data. It is sometimes also known as WWW-form encoding. All text is encoded as UTF-8, using a % followed by two hexadecimal digits for special or reserved characters. Some variations exist for handling spaces (+ or %20), and special characters (=, &, etc).
• UTF-8 – UTF-8 is a binary text encoding for Unicode. It is reasonably space efficient for latin languages and supports the full Unicode character range (i.e. most known scripts). Each character is stored into a variable number of bytes. Since JavaScript internally uses only two bytes for each character (UTF-16), this conversion utility only handles code points between U+0000 and U+FFFF. The result is 1 to 3 characters of output per input character.
• XML & HTML – The XML and HTML file formats require character escapes for <, >, & and a few more special cases. These are either decimal escapes (e.g.  ), hexadecimal escapes (e.g.  ) or predefined entities (e.g. &). Any character in the document may be encoded using escapes, so it is easy to create a pure ASCII version of any document.
• Checksums, Hashes & Digests – A hash function maps data to a fixed number of bits, normally encoded in hexadecimal. This mapping is frequently chaotic, in the sense that small input changes result in large changes to the hash output. Hashes can be used to verify password correctness, detect changes to data, to balance data structures, ensure message authenticity and much more. See the Wikipedia articles on CRC, cryptographic hash functions, MD5, SHA-1, SHA-2 or SHA-3 for in-depth information.