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.