The Complete WEBTOON Canvas Sizing & Formatting Guide (2026 Updated)
The pixel limits are simple. A clean, upload-ready episode takes a little more care. Here is what to check before your strip goes live.
Official WEBTOON dimensions
WEBTOON’s CANVAS upload notice identifies 800 × 1280 pixels as the maximum dimensions for a single episode image. Its published upload FAQ also lists a 2 MB limit per image and supports JPG/JPEG and PNG. These are image-file limits, not the dimensions of your entire episode.
| Check | Target | Why it matters |
|---|---|---|
| Width | 800 px maximum | Wider art may be resized during upload. |
| Height | 1280 px maximum per slice | A tall strip needs multiple consecutive files. |
| File size | 2 MB maximum per image | Dimensions alone do not control bytes. |
| Format | JPG/JPEG or PNG | WEBTOON’s published upload FAQ lists both. |
A slice can be 800 × 1280 px and still exceed 2 MB if its image content or export settings produce a large file. Inspect the exported JPGs before upload and adjust compression if needed.
WEBTOON says its uploader can automatically optimize and slice long images. Pre-slicing gives you more control over where cuts fall, file order, and the quality of each exported image. Always recheck the live upload interface: platform behavior and limits can change.
Why proportional slicing matters
A continuous vertical strip should be scaled proportionally before it is cut. If you force a 1600 px-wide image into an 800 px-wide box without preserving its ratio, faces, lettering, and panel spacing will distort. Reducing width by half also reduces the strip’s height by half; only then should the image be divided into consecutive slices of up to 1280 px.
Do not stretch each slice independently. Keep the original aspect ratio, use one consistent width, and retain the shorter final piece rather than adding an arbitrary crop through the artwork.
Step-by-step: prepare a long strip
- Finish and save your original. Keep a high-quality master copy so you can re-export later.
- Choose the WEBTOON Canvas preset. It caps width at 800 px and slices at 1280 px high.
- Add one or more PNG, JPG, or WebP source images. Review the queue order before exporting.
- Split and download the ZIP. The tool produces numbered JPEG slices in sequence.
- Check each output file. Confirm no slice exceeds 800 × 1280 px or 2 MB, scan cut boundaries, and then upload in order.
Use our free in-browser Webtoon Slicer. Your artwork stays on your device.
CreaPocket scales, slices, and exports numbered JPGs at 92% JPEG quality. It does not currently enforce a 2 MB per-file ceiling, so review the ZIP contents before publishing.
Pre-upload quality checklist
- Read every speech bubble at a phone-sized preview. Fine lettering often suffers first.
- Check that panel transitions do not land awkwardly at a slice boundary.
- Verify the numbered filenames follow your intended reading order.
- Compare each JPG’s file size with the 2 MB limit and check the episode’s total size in the live uploader.
- Keep your source art; re-export from the original if a file needs stronger compression.
WEBTOON Canvas sizing FAQ
Must every slice be exactly 800 × 1280 px?
No. Those are maximum dimensions. A narrower image or a shorter final slice can still fit the image-size guidance.
Can I upload one long vertical image instead?
WEBTOON says its uploader can automatically optimize and split long episode images. Pre-slicing is useful when you want to inspect the cuts and export order yourself.
Does 800 × 1280 px guarantee a file is under 2 MB?
No. File size depends on image complexity, format, and compression. Check the actual exported file size before uploading.
Should I use PNG or JPG?
WEBTOON’s published upload FAQ lists JPG/JPEG and PNG. JPG is often smaller for painted or photographic art; PNG can preserve crisp flat colors and linework but may be larger. CreaPocket’s slicer currently exports JPG.
Will the slicer upload my artwork to a server?
No. Image processing and ZIP creation happen in your browser. The page loads its JavaScript libraries, but your selected artwork is not sent to CreaPocket.
What if my exported slice is over 2 MB?
Re-export that image from your master at a lower JPEG quality or optimize it with a trusted local image editor, then review legibility. The current slicer does not automatically compress to a target file size.
Sources and updates
This guide was reviewed on November 5, 2026 against WEBTOON’s long-image upload notice and published upload FAQ. The latter was written for a contest, so use your current CANVAS publishing screen as the final authority for any account- or region-specific limit.