Preserve aspect ratio
Scale both dimensions together. Never force a vertical page into a different shape just to meet a width requirement.
Free webtoon tool
Calculate webtoon size before you export
Enter the dimensions of a vertical comic, the required upload width, and the maximum height allowed for each segment. The calculator preserves the aspect ratio and estimates how many ordered images you need.
Webtoon size calculator
How the calculation works
01
Scale without distortion
The new height is calculated from the original aspect ratio: original height × target width ÷ original width.
02
Split the scaled height
The calculator divides the scaled height by the maximum segment height and rounds up to include the final shorter segment.
03
Review the actual files
File size depends on image detail, compression, and format, so inspect the exported JPEG or PNG files before upload.
Why vertical comics are split
A long episode may be created as one continuous canvas, while publishing platforms accept several smaller images. When those images share the same width and remain in order, the reader experiences one continuing vertical sequence. A cut does not remove content; it only separates the canvas into uploadable files.
Choose safe cut points
Avoid cutting directly through dialogue, faces, or important action when your export workflow allows control over split positions.
Verify publisher rules
Platforms can change accepted width, height, file size, format, and episode limits. Check the current upload screen before final export.
Webtoon export questions
Will splitting a long image break the reading experience?
A platform normally displays uploaded vertical segments in sequence. Keep their width identical, preserve the order, and avoid resizing each segment differently.
Should I stretch the image to the target width?
No. Scale width and height together so the original aspect ratio is preserved.
Are upload limits the same everywhere?
No. Confirm the current requirements for the platform where you plan to publish, then enter those values into the calculator.