A robust & character encoding–agnostic JavaScript implementation of the `Quoted-Printable` content transfer encoding as defined by RFC 2045.

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quoted-printable is a character encoding–agnostic JavaScript implementation of the Quoted-Printable content transfer encoding as defined by RFC 2045. It can be used to encode plaintext to its Quoted-Printable encoding, or the other way around (i.e. decoding). Here’s an online demo using the UTF-8 character encoding.


Via npm:
npm install quoted-printable

Via Bower:
bower install quoted-printable

Via Component:
component install mathiasbynens/quoted-printable

In a browser:
<script src="quoted-printable.js"></script>

In Node.js, io.js, Narwhal, and RingoJS:
var quotedPrintable = require('quoted-printable');

In Rhino:

Using an AMD loader like RequireJS:
    'paths': {
      'quoted-printable': 'path/to/quoted-printable'
  function(quotedPrintable) {



A string representing the semantic version number.


This function takes an encoded byte string (the input parameter) and Quoted-Printable-encodes it. Each item in the input string represents an octet as per the desired character encoding. Here’s an example that uses UTF-8:
var utf8 = require('utf8');

// → 'foo=3Dbar'

// → 'I=C3=B1t=C3=ABrn=C3=A2ti=C3=B4n=C3=A0liz=C3=A6ti=C3=B8n=E2=98=83=F0=9F=92=\r\n=A9'


This function takes a string of text (the text parameter) and Quoted-Printable-decodes it. The return value is a ‘byte string’, i.e. a string of which each item represents an octet as per the character encoding that’s being used. Here’s an example that uses UTF-8:
var utf8 = require('utf8');

// → 'foo=bar'

// → 'Iñtërnâtiônàlizætiøn☃💩'

Using the quoted-printable binary

To use the quoted-printable binary in your shell, simply install quoted-printable globally using npm:
npm install -g quoted-printable

After that, you’ll be able to use quoted-printable on the command line. Note that while the quoted-printable library itself is character encoding–agnostic, the command-line tool applies the UTF-8 character encoding on all input.
$ quoted-printable --encode 'foo=bar'

$ quoted-printable --decode 'foo=3Dbar'

Read a local text file, Quoted-Printable-encode it, and save the result to a new file:
$ quoted-printable --encode < foo.txt > foo-quoted-printable.txt

Or do the same with an online text file:
$ curl -sL 'https://mths.be/brh' | quoted-printable --encode > quoted-printable.txt

Or, the opposite — read a local file containing a Quoted-Printable-encoded message, decode it back to plain text, and save the result to a new file:
$ quoted-printable --decode < quoted-printable.txt > original.txt

See quoted-printable --help for the full list of options.


quoted-printable is designed to work in at least Node.js v0.10.0, io.js v1.0.0, Narwhal 0.3.2, RingoJS 0.8-0.11, PhantomJS 1.9.0, Rhino 1.7RC4, as well as old and modern versions of Chrome, Firefox, Safari, Opera, and Internet Explorer.

Unit tests & code coverage

After cloning this repository, run npm install to install the dependencies needed for development and testing. You may want to install Istanbul globally using npm install istanbul -g.
Once that’s done, you can run the unit tests in Node using npm test or node tests/tests.js. To run the tests in Rhino, Ringo, Narwhal, and web browsers as well, use grunt test.
To generate the code coverage report, use grunt cover.


| twitter/mathias | |---| | Mathias Bynens |


quoted-printable is available under the MIT license.