Dark mode for textbook PDFs
Textbooks are long, often part-scanned, and you rarely have just one. This is built to handle that.
No account required. Preview free, then £0.99 per document.
Long documents
A textbook can run to hundreds of pages, well past a typical journal article or handout. The converter accepts documents up to 500 pages and 100 MB, which covers the great majority of textbook PDFs in one pass.
Scanned chapters
Not every textbook PDF is a clean digital export — course readers are often scanned from a physical copy, sometimes chapter by chapter with different scan quality. Scanned pages are recognised as documents rather than photographs and get the full dark treatment, with scanner dust despeckled first so it does not turn into a field of bright specks once the page goes dark.
A term's worth of readings
A single conversion is £0.99, but a reading list is rarely one file. A 5-conversion pack is available at £2.99 — 60p each — so a stack of chapters or a set of course PDFs does not mean five separate checkouts.
Figures, equations and diagrams
Diagrams and charts common in textbooks keep their data colours while their background goes dark, so labelled axes and coloured plots stay readable rather than becoming an inverted mess.
Questions
Will this work on a scanned chapter, not just a digital textbook?
Yes. Scanned pages are recognised and get the full dark treatment, with scanner dust removed first so it does not become bright specks after inversion.
How long a textbook can I convert?
Up to 500 pages and 100 MB per document.
I have several readings to convert, not just one — is there a discount?
Yes. A 5-conversion pack is £2.99, which works out at 60p per document instead of £0.99 each, and the credits can be used across separate files.
Will diagrams and graphs in the textbook still make sense?
Yes. Charts and diagrams are classified separately from photographs and text — they keep their data colours while their background goes dark, so labels and plotted lines stay legible.