Webtoon Panel Slicing & Spacing Calculator
Work out slice heights, panel gutters, and pixel coordinates for long vertical webtoon and card-news images
Before you cut a tall vertical-scroll webtoon page or a card-news graphic into pieces, this calculator works out the exact start and end coordinates for every slice, factors in the vertical gutter you want between panels, and hands you a ready-to-run script.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Enter the resolution of your full source image (width and height in pixels).
- Set how many slices you want and how much vertical padding (in px) to insert per slice.
- Copy the resulting coordinate table, plus the generated shell script for batch slicing with ImageMagick or a similar tool.
FAQ
- What upload dimensions do webtoon platforms expect?
- Major Korean portal webtoon platforms typically want a width of 690px or 800px, and they recommend keeping each individual file under 10,000px tall because of file size limits. This calculator derives cut coordinates that keep every slice within those limits.
- What's the downside of setting the gap between panels too large?
- An overly large gap breaks the sense of flow while scrolling, and in scenes with continuous dialogue, readers can easily lose the thread between panels. A gap somewhere around 40–80px generally gives a natural pause without disrupting the continuity between cuts.
- What's the downside of setting the gap between panels too large?
- An overly large gap breaks the sense of flow while scrolling, and in scenes with continuous dialogue, readers can easily lose the thread between panels. A gap somewhere around 40–80px generally gives a natural pause without disrupting the continuity between cuts.