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About the developer

8.2K Stars 1.2K Forks MIT License 2.7K Commits 363 Opened issues


Dark Reader Chrome and Firefox extension

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Dark Reader for Google Chrome, Microsoft Edge and Mozilla Firefox

Dark Reader screenshot

This extension inverts brightness of web pages and aims to reduce eyestrain while you browse the web.
Visit Edge Addons, Chrome Web Store and Firefox Add-ons for more info.

How to contribute


Donate via Open Collective.


Improve or suggest a translation. See the list of language codes that we can support.

Fix a wrong inversion!

If a website is already dark (has all pages dark by default), you can add it to the dark-sites.config file (please, preserve alphabetical order).

If some parts of a web page are wrongly inverted, you can fix this by specifying appropriate CSS selectors in dynamic-theme-fixes.config (for Dynamic Theme mode) or inversion-fixes.config (for Filter and Filter+ modes) (please, preserve alphabetical order by URL, use short selectors, and preserve code style).

Automatically syncing the above files to every Dark Reader user was disabled because the GitHub team doesn't allow using GitHub as a CDN. Storing these files and making requests to other resources would be expensive and look suspicious. As such, changes are included with each new Dark Reader release.

Use Dev Tools!

Dev Tools is designed to fix minor issues on a web page (like dark icon on dark background, removing bright background, adding white background to transparent image, etc.). If the page looks partially dark and bright in Dynamic mode, we consider it a bug. For Filter mode, it is a common practice to invert already dark page parts.

  • Open Chrome Dev Tools (F12) in Chrome or "Inspector" (Ctrl+Shift+C) in Firefox.
  • Click on element picker (top-left corner). It is enabled automatically in Firefox.
  • Pick wrongly inverted element.
  • Choose a selector for that element or all similar elements (e.g. if element has
    class="icon small"
    , selector may look like
  • Click Dark Reader icon.
  • Click Open developer tools (at bottom of Dark Reader popup).
  • Edit or add a block containing the URL and selectors to invert.
  • Click Apply.
  • Check how it looks both in Light and Dark mode.
  • If the fix works open dynamic-theme-fixes.config file or inversion-fixes.config file.
  • Click Edit (login to GitHub first).
  • Insert your fix there. Preserve alphabetic order by URL.
  • Provide a short description of what you have done.
  • Click Propose file change.
  • Review your changes. Click Create pull request.
  • The Travis CI will run tests reviewing your changes.
  • If you see a red cross click Details to see what is wrong and edit the existing Pull Request.
  • When you see a green checkmark then everything is fine.
  • Dark Reader developer will review and merge your changes, making them available to all users.

INVERT .icon

CSS .wrong-element-colors { background-color: ${white} !important; color: ${black} !important; }



    rule inverts specified elements. For Dynamic mode use
    only for dark images that are invisible on dark backgrounds (icons, diagrams, charts,
  • CSS
    rule adds custom CSS to a web page.
    keyword should be specified for each CSS property to prevent overrides by other stylesheets. Dynamic mode supports
    template, where
    is a color value before the inversion (
    will become
    in dark mode).
    rule will prevent inline style analysis of matched elements (e.g. for

    attribute will not be changed).
    rule will prevent background images from being analyzed for matched selectors.

Dynamic variables

When making a fix for background or text colors, instead of using hardcoded colors (like

), please use CSS variables that are generated based on user settings:

CSS .logo { background-color: var(--darkreader-neutral-background); } .footer > p { color: var(--darkreader-neutral-text); }

Here is a full list of available CSS variables:

  • --darkreader-neutral-background
    should be mostly used for elements that have a wrong background color (usually bright backgrounds that should be dark).
  • --darkreader-neutral-text
    should be used for elements with a wrong text color (usually dark texts that should be light).
  • --darkreader-selection-background
    corresponds to user's Selection Background Color setting.
  • --darkreader-selection-text
    corresponds to user's Selection Text Color setting.

Fixes for Filter and Filter+ modes.


INVERT .icon .button #player

NO INVERT #player *

REMOVE BG .bg-photo

CSS .overlay { background: rgba(255, 255, 255, 0.5); }

  • Filter and Filter+ work by inverting the whole web page and reverting necessary parts (images, videos, etc.), listed in the
  • If an inverted element contains images or other content that becomes wrongly displayed,
    rule can be used.
    removes the background image from an element and forces a black background.

Add new features or fix bugs!

If you would like to add new feature to Dark Reader or fix a bug, submit an issue in GitHub (if there is no existing one), discuss it with active contributors, and wait for approval.

To build and debug the extension install the Node.js LTS.
Install development dependencies by running

npm install
in the project root folder.
Then execute
npm run debug

Chrome and Edge

  • Open the
  • Disable the official Dark Reader version.
  • Enable the Developer mode.
  • Click Load unpacked extension button
  • Navigate to the project's


  • Open the
  • Disable the official Dark Reader version.
  • Open
  • Click Load Temporary Add-on button
  • Open the

After making any code changes, the project will be automatically recompiled.
If the extension does not reload automatically, it can be reloaded manually on the extensions page.

For editing the code you can use any text editor or web IDE (like Visual Studio Code, Atom, or WebStorm).

Please preserve code style (whitespaces etc).

Run tests by executing

npm test

Submit a pull request, and wait for review.

Building for use

You can install the extension from a file.
Install Node.js LTS. Download the source code (or check out from git).
Open terminal in root folder and run:

npm install

npm run release

This will generate
for use in Chromium browsers and
for use in Firefox.

Using for a website

You can use Dark Reader to enable dark mode on your website! - Install the package from NPM (

npm install darkreader
) - or build from the source code (
npm run api
) - or include the script via a CDN such as unpkg or jsDelivr

Then use the following API ```javascript DarkReader.enable({ brightness: 100, contrast: 90, sepia: 10 });


// Enable when system color scheme is dark.{ brightness: 100, contrast: 90, sepia: 10 });

// Stop watching for system color scheme.;

// Get the generated CSS of Dark Reader returned as a string. const CSS = await DarkReader.exportGeneratedCSS();

... or if you are using ES modules
javascript import { enable as enableDarkMode, disable as disableDarkMode, auto as followSystemColorScheme, exportGeneratedCSS as collectCSS, } from 'darkreader';

enableDarkMode({ brightness: 100, contrast: 90, sepia: 10, });



const CSS = await collectCSS(); ```


This project exists thanks to all the people who contribute!


Thank you to all our generous backers!


Support this project by becoming a sponsor. Thank you to our wonderful sponsors!

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