Invert PDF colors

1 min read·23 July 2026

Want to convert a PDF to a negative image — white becomes black, black becomes white? PDFrust's invert tool flips all colors per page. Useful for dark mode reading or special print effects.

When do you use color inversion?

Color inversion is useful when you want to read a document with a dark background (less eye strain in the evening), for making light text visible on a dark background in a scan, or for artistic and graphic applications.

How does the invert tool work?

The tool renders each page as an image and applies the color inversion formula: new colour = 255 − original colour. This applies to each red, green and blue channel separately. The result is a fully negative image.

Invert PDF colours

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Difference from converting to greyscale?

Greyscale removes colour information but preserves brightness. Colour inversion preserves colour information but flips brightness. A white background becomes black, blue text becomes orange. They are fundamentally different effects.

What happens to images in the PDF?

All elements on the page are converted, including images, charts and text. It is a page-wide operation — you cannot selectively exclude certain elements from the inversion.