Invert page colours and save an image-based PDF.
When is it useful? Invert PDF Colours turns white pages black and black text white — easier on the eyes for reading at night, and handy for some printing and accessibility needs.
Good to know: every page is rendered at 150 DPI and its colours are inverted, so the new PDF is made of page images: text is no longer selectable, and links and form fields are removed. Colour photos turn into negatives. Up to 100 pages are processed.
| In your PDF | After inverting |
|---|---|
| White pages, black text | Black pages, white text |
| Colour photos | Turn into negatives |
| Pages | Rendered at 150 DPI as images |
| Selectable text, links, form fields | Removed |
| Page limit | Up to 100 pages |
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White pages with black text can be tiring to read at night or for people sensitive to bright light. Inverting turns pages into white or light text on a black background. It is also used to recover negatives of scanned film, to prepare dark-themed slides from documents, and for some special printing jobs.
Each page is drawn at 150 DPI, every colour is replaced by its opposite (white becomes black, blue becomes orange, and so on), and the page is saved into a new PDF as an image. Up to 100 pages are processed.
Because pages become images, the inverted PDF loses selectable and searchable text, clickable links and form fields. Photos turn into colour negatives, which can look strange. For comfortable night reading only, a viewer's dark mode is often better because it keeps the original file unchanged.
You need to search the inverted file: run OCR PDF on it. Printing uses too much ink: do not print inverted pages unless you need to — print the original instead. Some colours look odd: inverted colours are exact opposites; that is expected.
Keep the original PDF, use inverted copies for reading on screens, and check a few pages before inverting a very long document.