A clean handoff from original comic art to WEBTOON CANVAS episode slices, thumbnails, and preview checks.
Before uploading to WEBTOON CANVAS, keep your master art, confirm rights and rating fit, slice the episode by reading beats, export role-specific JPG or PNG copies, compress gently, then preview the episode and thumbnails in the current dashboard.
Prepare The Source Before Slicing
Start with the best source file, not a previously compressed upload copy. Save the long-scroll master and duplicate it for delivery exports. Confirm that the artwork is original, licensed, or permitted; remove private messages, email addresses, account details, and real dashboard information; then decide whether the asset is an episode slice, thumbnail, title card, or profile image.
Follow A WEBTOON CANVAS Upload Workflow
| Upload prep stage | Creator action | Common mistake | Final check |
|---|---|---|---|
| 1. Save the master | Keep a high-quality long-scroll file and work from a duplicate. | Compressing the only source and losing repair options. | The master remains untouched. |
| 2. Confirm rights | Use your own characters, licensed assets, or permitted materials. | Copying manga, anime, game, movie, logo, or another artist's work. | Every visible asset has permission. |
| 3. Check rating fit | Review the episode, thumbnail, and promo image against the current content rating flow. | Using a thumbnail that hides rating-sensitive content or misrepresents tone. | The rating and visible art tell the same truth. |
| 4. Slice by reading beat | Cut the episode where action, reaction, and speech remain complete. | Splitting a speech bubble or emotional moment across slices. | Panel order reads naturally on mobile. |
| 5. Choose JPG or PNG | Use JPG for many full-color scenes and PNG for crisp line art or text-heavy title cards. | Using one format for every image role. | Line art, gradients, and lettering survive the export. |
| 6. Compress a sample | Test one dialogue slice and one detailed art slice before batching. | Batch-compressing the whole episode before checking damage. | The sample meets file goals without visible artifacts. |
| 7. Build thumbnails separately | Create square, vertical, and episode thumbnails for their own crops. | Reusing a random panel that is unclear or misleading. | Thumbnail is readable, honest, and under the current limit. |
| 8. Upload and preview | Review the episode order, mobile readability, thumbnails, and file warnings. | Publishing from the file list without checking the reader preview. | No blur, broken slice, wrong rating, private data, or rights issue remains. |
Compress After Lettering Passes
Compression is the last technical step, not the first. If a speech bubble is barely readable in the source, reducing file weight will make the problem worse. First check the bubble size, contrast, and slice boundary; then make a lighter delivery copy and compare it with the original at phone width.
FAQs About Preparing WEBTOON CANVAS Images
Check rights, rating fit, file type, slice order, speech-bubble readability, per-image weight, total episode size, thumbnail crop, and the current upload preview.
Slice around reading beats. Keep action, reactions, and speech bubbles complete, then compare the sequence in mobile preview before publishing.
Use a duplicate, test one detailed panel first, avoid aggressive compression, and compare line edges and lettering against the original.
Preview episode order, phone readability, thumbnails, file warnings, rating fit, and whether every image honestly represents the episode.
Confirm you own or have permission for the artwork, avoid copied characters or logos, remove private data, and complete the current WEBTOON rating flow honestly.
