Awesome Open Source
Awesome Open Source

Dark Reader for Google Chrome, Microsoft Edge, Mozilla Firefox and Mozilla Thunderbird

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, Firefox Add-ons and Thunderbird 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 .icon).
  • 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.


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


  • INVERT rule inverts specified elements. For Dynamic mode use INVERT only for dark images that are invisible on dark backgrounds (icons, diagrams, charts, <img> and <svg> elements).
  • CSS rule adds custom CSS to a web page. !important keyword should be specified for each CSS property to prevent overrides by other stylesheets. Dynamic mode supports ${COLOR} template, where COLOR is a color value before the inversion (white will become black in dark mode).
  • IGNORE INLINE STYLE rule will prevent inline style analysis of matched elements (e.g. for <p style="color: red"> element's style attribute will not be changed).
  • IGNORE IMAGE ANALYSIS 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 #fff, #000, black or white), please use CSS variables that are generated based on user settings:


.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



#player *


.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 INVERT section.
  • If an inverted element contains images or other content that becomes wrongly displayed, NO INVERT rule can be used.
  • REMOVE BG 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 chrome://extensions page.
  • Disable the official Dark Reader version.
  • Enable the Developer mode.
  • Click Load unpacked extension button
  • Navigate to the project's debug/ folder.


  • Open the about:addons page.
  • Disable the official Dark Reader version.
  • Open about:debugging#addons page.
  • Click Load Temporary Add-on button
  • Open the debug-firefox/manifest.json file.

If you want the project to be automatically recompiled after making code changes, run npm run debug-watch instead of npm run debug.

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 build

This will generate for use in Chromium browsers and build-firefox.xpi 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

    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();

// Check if Dark Reader is enabled.
const isEnabled = DarkReader.isEnabled();

... or if you are using ES modules

import {
    enable as enableDarkMode,
    disable as disableDarkMode,
    auto as followSystemColorScheme,
    exportGeneratedCSS as collectCSS,
    isEnabled as isDarkReaderEnabled
} from 'darkreader';

    brightness: 100,
    contrast: 90,
    sepia: 10,



const CSS = await collectCSS();

const isEnabled = isDarkReaderEnabled();


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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