Invert a PDF's colours for night reading
White pages on a dark screen glare. Flip every page to dark-mode — the PDF becomes white-on-black rasterized pages.
Tools used in this guide
The job
Dark-mode everything except PDFs: the reader's theme changes but the page stays a bright white rectangle. Inverting the pixels — white becomes black, body text becomes light — is the crude trick that actually works for reading at night.
Upload, invert, download
Drop the PDF (up to 25 MiB, 60 pages). Each page renders to canvas, the RGB channels flip while alpha stays, and the inverted pages repack into a new PDF as JPEG images.
- Everything inverts — photos become negatives too. For text-dominant documents that's fine; for photo-heavy ones, grayscale may read better.
- Output is rasterized: no text layer, no selection, no search — the trade for guaranteed dark pages.
The honest trade
This is a readability hack, not a document conversion. The inverted PDF is an image-bucket copy — bigger than the original sometimes, and useless for printing (it would print the black background). For archival or printing, keep the original.