Make a PDF more readable: contrast, colour, and black-and-white
1 min read·25 July 2026
Some PDFs are hard to read: low contrast, light text on a light background, or bright colours that distract. PDFrust offers tools to improve readability.
Convert PDF to black and white
A PDF with many colours can be distracting for people with colour blindness or when printing in black and white. PDFrust's grayscale tool converts all colours to shades of grey, ideal for printing and readability.
Invert colours for dark mode
Want to read a PDF in "dark mode" (white text on black background)? The invert tool switches all colours, text becomes white on black. Useful for night-time reading or for eye fatigue.
PDF grayscale
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Sepia tone for easier reading
The sepia tool gives the PDF a warm, yellow-brown tint. This is considered gentler on the eyes than a pure white background when reading at night. Popular with people who find white backgrounds tiring.
Adjust images and colours in PDF
PDFrust's colour-related tools work on the entire document. You cannot selectively change one specific text or area colour: that requires a full PDF editor. But for overall contrast and tone changes, the tools are ideal.
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