The best settings to convert comics for e-ink readers

E-ink readers have their own rules. What looks great on a phone can look muddy on e-paper, and settings that seem minor make a visible difference. Here's how to get the most out of a conversion for an e-ink device.

Match the resolution to the screen

Every e-reader has a fixed panel resolution — a Kindle Paperwhite is 1236×1648, a Kobo Clara is 1264×1680, a large Boox can be 1404×1872. There is no benefit to feeding it images larger than its screen: the device just downscales them, and your file is needlessly huge. There's no benefit to smaller images either — they look soft. The sweet spot is to render each page at the device's native resolution. Picking the matching device profile in TomoRead does this for you.

Convert to grayscale

Standard e-ink is grayscale. Colour data in the file does nothing on screen except inflate the size and, occasionally, muddy the contrast. Converting to grayscale with a light auto-contrast pass gives cleaner blacks and crisper screentone. If you have one of the newer colour e-ink devices, this is the exception — keep colour there.

Panel splitting: on for manga, optional for prose-heavy pages

Splitting pages into panels is the biggest readability win on small screens, and you'll want it on for almost all manga and comics. The exception is pages that are mostly a single splash image or heavy narration — those read fine whole, and a good converter will leave them alone rather than force a split.

Trim the margins

Scanned pages often carry wide white (or black) borders. Trimming them before fitting the page to the screen means the actual artwork gets more of your limited pixels. It's a small setting with an outsized effect on perceived sharpness.

Double-page spreads

A two-page spread scanned as one wide image is unreadable on a small portrait screen. Splitting it into two pages — in the correct reading order — fixes that. But a spread where the artwork flows across the fold (a single big illustration) should stay whole. The right behaviour is to split spreads with a clear central gutter and keep the panoramic ones intact.

Quality vs file size

For e-ink, a JPEG quality around 82–88 is visually indistinguishable from maximum and produces far smaller files, which matters when you're sending dozens of chapters over Wi-Fi. If you're archiving rather than reading, you can push quality higher or keep PNG.

If you're unsure, start with the Smart conversion defaults for your device profile. They already encode all of the above. Only reach for Advanced options when you want to override something specific — like reading direction for manga.