PDF Dark Mode
Turn a PDF into a dark-mode version for night reading.
About this tool
Drop in a PDF, choose a dark theme (soft dark grey, pure black for OLED screens, or night sepia), decide whether colours should keep their hue, pick a quality and download a dark copy of every page.
How dark mode for PDFs works
Most PDF readers can't recolour a page, because a PDF fixes the colour of everything on it. This tool renders each page, inverts its lightness so white paper becomes dark and black text becomes light, then maps the result onto the theme you chose: soft dark grey (easiest on the eyes for long reading), pure black (saves power on OLED phones and tablets) or night sepia (warm and low in blue light). With keep hues on, a red heading stays red and a blue chart stays blue instead of turning cyan and orange, which keeps diagrams and photos readable. The result is a new PDF made of page images at 120, 150 or 200 DPI. Honest limits: because pages become images, text in the dark copy can't be selected or searched (keep the original for that), files are often larger than the source, and photos look like dark versions of themselves. Many apps also have a built-in reading mode worth trying first. The PDF grayscale tool and the PDF compressor are related.
Frequently asked questions
Will text in the dark PDF still be selectable?
No. Pages are re-rendered as images, so keep the original if you need to search or copy text.
Which theme should I choose?
Soft dark grey for long reading, pure black for OLED screens, and night sepia for warm, low-blue light.
Do images and charts survive?
Yes. With keep hues on, colours keep their hue while their lightness is inverted, so charts stay readable.
Why is the dark PDF bigger?
Each page is stored as an image. Choose 120 DPI for a smaller file or 200 DPI for sharper text.
Is my file uploaded anywhere?
No. The file is read and processed in your browser on this device; nothing is uploaded or stored.