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An easy whitelist-based HTML-sanitizing tool.

Project description

Bleach is a whitelist-based HTML sanitizing library that escapes or strips markup and attributes.

Bleach can also linkify text safely, applying filters that Django’s urlize filter cannot, and optionally setting rel attributes, even on links already in the text.

Bleach is intended for sanitizing text from untrusted sources. If you find yourself jumping through hoops to allow your site administrators to do lots of things, you’re probably outside the use cases. Either trust those users, or don’t.

Because it relies on html5lib, Bleach is as good as modern browsers at dealing with weird, quirky HTML fragments. And any of Bleach’s methods will fix unbalanced or mis-nested tags.

The version on GitHub is the most up-to-date and contains the latest bug fixes. You can find full documentation on ReadTheDocs.

Issue tracker:
IRC:#bleach on
License:Apache License v2; see LICENSE file

Reporting Bugs

For regular bugs, please report them in our issue tracker.

If you believe that you’ve found a security vulnerability, please file a secure bug report in our bug tracker or send an email to security AT mozilla DOT org.

For more information on security-related bug disclosure and the PGP key to use for sending encrypted mail or to verify responses received from that address, please read our wiki page at

Installing Bleach

Bleach is available on PyPI, so you can install it with pip:

$ pip install bleach

Or with easy_install:

$ easy_install bleach

Or by cloning the repo from GitHub:

$ git clone git://

Then install it by running:

$ python install

Upgrading Bleach


Before doing any upgrades, read through Bleach Changes for backwards incompatible changes, newer versions, etc.

Basic use

The simplest way to use Bleach is:

>>> import bleach

>>> bleach.clean('an <script>evil()</script> example')
u'an &lt;script&gt;evil()&lt;/script&gt; example'

>>> bleach.linkify('an url')
u'an <a href="" rel="nofollow"></a> url

Bleach Changes

Version 1.5 (November 4th, 2016)

Backwards incompatible changes

  • clean: The list of ALLOWED_PROTOCOLS now defaults to http, https and mailto. Previously it was a long list of protocols something like ed2k, ftp, http, https, irc, mailto, news, gopher, nntp, telnet, webcal, xmpp, callto, feed, urn, aim, rsync, tag, ssh, sftp, rtsp, afs, data. #149


  • clean: Added protocols to arguments list to let you override the list of allowed protocols. Thank you, Andreas Malecki! #149
  • linkify: Fix a bug involving periods at the end of an email address. Thank you, Lorenz Schori! #219
  • linkify: Fix linkification of non-ascii ports. Thank you Alexandre, Macabies! #207
  • linkify: Fix linkify inappropriately removing node tails when dropping nodes. #132
  • Fixed a test that failed periodically. #161
  • Switched from nose to py.test. #204
  • Add test matrix for all supported Python and html5lib versions. #230
  • Limit to html5lib >=0.999,!=0.9999,!=0.99999,<0.99999999 because 0.9999 and 0.99999 are busted.
  • Add support for python test. #97

Version 1.4.3 (May 23rd, 2016)


  • Limit to html5lib >=0.999,<0.99999999 because of impending change to sanitizer api. #195

Version 1.4.2 (September 11, 2015)


  • linkify: Fix hang in linkify with parse_email=True. #124
  • linkify: Fix crash in linkify when removing a link that is a first-child. #136
  • Updated TLDs.
  • linkify: Don’t remove exterior brackets when linkifying. #146

Version 1.4.1 (December 15, 2014)


  • Consistent order of attributes in output.
  • Python 3.4 support.

Version 1.4 (January 12, 2014)


  • linkify: Update linkify to use etree type Treewalker instead of simpletree.
  • Updated html5lib to version >=0.999.
  • Update all code to be compatible with Python 3 and 2 using six.
  • Switch to Apache License.

Version 1.3

  • Used by Python 3-only fork.

Version 1.2.2 (May 18, 2013)

  • Pin html5lib to version 0.95 for now due to major API break.

Version 1.2.1 (February 19, 2013)

  • clean() no longer considers feed: an acceptable protocol due to inconsistencies in browser behavior.

Version 1.2 (January 28, 2013)

  • linkify() has changed considerably. Many keyword arguments have been replaced with a single callbacks list. Please see the documentation for more information.
  • Bleach will no longer consider unacceptable protocols when linkifying.
  • linkify() now takes a tokenizer argument that allows it to skip sanitization.
  • delinkify() is gone.
  • Removed exception handling from _render. clean() and linkify() may now throw.
  • linkify() correctly ignores case for protocols and domain names.
  • linkify() correctly handles markup within an <a> tag.

Version 1.1.5

Version 1.1.4

Version 1.1.3 (July 10, 2012)

  • Fix parsing bare URLs when parse_email=True.

Version 1.1.2 (June 1, 2012)

  • Fix hang in style attribute sanitizer. (#61)
  • Allow ‘/’ in style attribute values.

Version 1.1.1 (February 17, 2012)

  • Fix tokenizer for html5lib 0.9.5.

Version 1.1.0 (October 24, 2011)

  • linkify() now understands port numbers. (#38)
  • Documented character encoding behavior. (#41)
  • Add an optional target argument to linkify().
  • Add delinkify() method. (#45)
  • Support subdomain whitelist for delinkify(). (#47, #48)

Version 1.0.4 (September 2, 2011)

  • Switch to SemVer git tags.
  • Make linkify() smarter about trailing punctuation. (#30)
  • Pass exc_info to logger during rendering issues.
  • Add wildcard key for attributes. (#19)
  • Make linkify() use the HTMLSanitizer tokenizer. (#36)
  • Fix URLs wrapped in parentheses. (#23)
  • Make linkify() UTF-8 safe. (#33)

Version 1.0.3 (June 14, 2011)

  • linkify() works with 3rd level domains. (#24)
  • clean() supports vendor prefixes in style values. (#31, #32)
  • Fix linkify() email escaping.

Version 1.0.2 (June 6, 2011)

  • linkify() supports email addresses.
  • clean() supports callables in attributes filter.

Version 1.0.1 (April 12, 2011)

  • linkify() doesn’t drop trailing slashes. (#21)
  • linkify() won’t linkify ‘’. (#22)

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