Invert PDF colours for dark-mode reading
Flip a PDF to a dark background with light text for easier night reading, or invert a scanned document to save ink when printing. Every pixel is inverted directly in your browser.
Invert PDF Colours
canvas pixel inversion · full-page render
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How to Invert PDF Colours
- Add your PDF. Drag the file onto the drop zone.
- Invert. Click Invert colours. Each page is rendered and every pixel's colour is flipped.
- Download. Save the inverted PDF.
What inversion is actually for
The obvious use is comfort: reading a long, mostly-white document on a phone or laptop late at night is genuinely harder on the eyes than reading light text on a dark background. Inverting flips a standard black-on-white PDF into exactly that.
A less obvious but practical use is ink. A page that's mostly a dark background — a slide export, a dense diagram, a scanned negative — uses far more toner or ink to print than the same content with the colours flipped to a light background. Inverting before printing can make a real difference on documents like that.
This rebuilds every page as an image
Inverting colour requires reading and rewriting every pixel on the page, which means each page is rendered to a canvas, has its colours flipped, and is re-encoded — the same technique used by this site's Compress PDF and Repair PDF tools.
The practical consequence is that any text on the page stops being selectable or searchable in the output, since it's now part of a rendered image rather than structured text. For a document you mainly want to read or print, that trade-off is invisible. If you need the inverted version to stay searchable, that isn't something inversion by itself can preserve — a text PDF's dark-mode display is usually better handled by your reader's own dark mode rather than modifying the file.
Frequently asked questions
Will the text still be selectable after inverting?
No. Inverting rebuilds every page as an image with its colours flipped, so text becomes part of the image rather than staying as selectable, searchable content.
Is this the same as my PDF reader's dark mode?
No. A reader's dark mode is a display setting that doesn't touch the file — this tool permanently rewrites the pixels of every page. Use your reader's dark mode if you only need on-screen comfort and want to keep the file's text selectable; use this tool if you need the inverted version as a standalone file, for example to send to someone else.
Is my file uploaded anywhere?
No. Rendering and inversion both happen entirely in your browser.
Does this save ink when printing?
For pages that are mostly a dark background, yes — flipping to a light background before printing meaningfully reduces ink and toner use. For an ordinary text page, which is already mostly white, there's little to gain.
Can I invert only some pages?
Not currently — inversion applies to the whole document.
Will colours (not just black and white) invert correctly?
Yes. Every colour channel is inverted, so a red heading becomes cyan, a blue chart line becomes orange, and so on — the same effect as a photo negative.