A decision page for creators choosing dimensions, format, crop, file weight, and preview checks by image role.
When a creator is exporting episode slices, square thumbnails, and vertical thumbnails before a WEBTOON CANVAS upload, there is no single image size that fits every asset. Each role needs a separate decision for dimensions, JPG or PNG format, crop safety, compression level, and the current upload screen.
Match The Format To The Comic Detail
JPG is usually the first test for full-color comic pages, painted scenes, textured backgrounds, and thumbnails where the file-size limit is tight. PNG is often safer for sharp line art, flat-color images, title cards, and lettering-heavy panels. GIF should not be treated as the default for static comic art; use it only when an upload role and current guidance truly support it.
Compare WEBTOON CANVAS Roles Before Export
| Image role | Size or export logic | Format logic | Compression or crop risk | Preview checklist |
|---|---|---|---|---|
| Episode slice | Prepare controlled slices around current 800x1280-style guidance when possible. | JPG for full color; PNG for crisp line art or text tests. | Automatic slicing may split bubbles or reduce image quality. | Panel order, mobile text, per-image weight, and total episode weight. |
| Square series thumbnail | Use the current 1080x1080 dashboard requirement. | JPG often helps stay under 500 KB; PNG can work for flat art. | Character faces and title mood can be lost in a busy square crop. | Center crop, file size, no small text, and current dashboard preview. |
| Vertical series thumbnail | Design separately for the current 1080x1920 vertical role. | JPG for illustrated poster art; PNG if edge clarity is more important. | A stretched square crop can feel empty or cut off the character. | Top-to-bottom composition, focal point, and under-700 KB target. |
| Episode thumbnail | Follow the current episode thumbnail upload screen. | JPG, JPEG, or PNG according to current WEBTOON guidance. | A random panel may not represent the episode clearly. | Episode list preview, file name, and truthful story cue. |
| Title card or text panel | Export from a high-quality source at the needed role size. | PNG first when small type or hard edges matter. | JPG artifacts can halo around letters and flat shapes. | Letter edges, contrast, and readable safe area. |
| Promo or profile image | Use the destination's current crop and display area. | Choose the smaller clean copy after rights and rating checks. | Private data, copied art, or misleading branding creates policy risk. | Permissions, rating fit, crop, and visual honesty. |
Keep The Master Separate From Upload Copies
The safest workflow is not to make your drawing canvas tiny just because the upload copy is smaller. Draw or preserve a clean master, then export delivery copies for episode slices and thumbnail roles. That gives you a way back if compression damages a speech bubble, a vertical thumbnail needs a different crop, or WEBTOON changes a requirement on the upload screen.
FAQs About WEBTOON CANVAS Size And Format
WEBTOON creator materials reference 800x1280 px maximum dimensions for episode images. Use that as a planning frame and verify the current upload screen.
WEBTOON CANVAS thumbnail guidance currently lists square series thumbnails at 1080x1080 and under 500 KB, with JPG, JPEG, and PNG allowed.
The current guidance lists vertical series thumbnails at 1080x1920 and under 700 KB. Design it as a separate poster-style asset.
JPG is often better for smaller full-color delivery copies. PNG is often better when line art, flat colors, or text edges must stay crisp.
Yes. Keep the master file so you can repair slice boundaries, lettering, and thumbnail crops without repeatedly compressing the only copy.
