Invert pdf's color while reading it on iPad

I use Notability to write notes, and GoodNotes to read papers (In some other posts, I will explain my workflow on how I read papers.). Both of them does not provide the option to invert the color of the pdf. But wait wait, I recently found a way to invert the color of a pdf while reading it on an iPad. I will show you how to do it.

Steps:

1. Open iPad Settings.
2. Click Accessibility. In GENERAL section, click Accessibility Shortcut. Tick out Classic Invert, Colour Filters.
3. Click Control Centre. In MORE CONTROL section, Click + button to include Accessibility Shortcuts.
4. Now, in the control center, you can see Accessibility Shortcuts button. Tick out Invert Color and Colour Filters. Colour Filters is optional but I recommend them. You will recognize the difference 😃.
5. Open any of your pdf from any app.
6. Hurray! You have successfully inverted the color of the pdf while reading it on iPad.

These steps also apply to iPhone users 😉. Btw if you want to invert the color of the local pdf while using the Microsoft Edge browser then, the easiest step is to install any night mode extension (I use Dark Reader). But in edge://extensions setting, click Details of that extension then, tick Allow access to file URLs.

I hope this helps you 😃.

Update: From 09 November 2022, notability allows you to invert the color of pdf via night mode. See here.