The standard webtoon canvas size for WEBTOON Canvas is 800 pixels wide, with every uploaded image no taller than 1280 pixels. An episode is a tall stack of those slices that the reader scrolls as one strip. The number most people get wrong is not the upload size but the size they draw at, so this guide covers both, plus panel spacing, file limits and thumbnails, and says plainly where a layout tool like BlankComic fits in.
Quick Summary
- Upload spec for WEBTOON Canvas: 800 px wide, up to 1280 px tall per image, each file around 2 MB, about 20 MB per episode.
- Draw at twice the width (1600 px) and shrink on export, so lines stay sharp and you never scale art up.
- Space panels by at least 200 px at 800 px width; use 600 to 1000 px when the scene or time changes.
- BlankComic handles the layout and lettering of a vertical strip. Final resizing to 800 px and slicing happen in an image editor.
The numbers that matter
Most of the confusion online comes from mixing two canvases: the one you draw on and the one you upload. Here is the upload side, as it stands in October 2026.
| Item | Value | Note |
|---|---|---|
| Episode image width | 800 px | The one number to memorize |
| Episode image height | up to 1280 px per file | The episode itself can be far taller |
| File size | about 2 MB each, 20 MB per episode | From Webtoon’s own creator note |
| Format | JPG is the safe choice | Older Webtoon text says JPG only; some guides say PNG works |
| Series thumbnails | 1080 × 1080 and 1080 × 1920 | Under 500 KB and 700 KB |
| Episode thumbnail | 202 × 142 px recommended | Under 500 KB |
These limits have moved before and different guides disagree on file type, so treat this table as a checklist and confirm it against the upload screen on Webtoon Canvas before you export forty images.
What to draw at, and why it is not 800 px
You can draw at exactly 800 px wide. Plenty of beginners do, and the result looks soft, because thin lines have almost no pixels to live in. Working artists tend to draw at roughly double the final width, so 1600 px, and export down. Clip Studio’s own tutorials say the same: a bigger canvas costs nothing and scaling a small image up always loses quality.
Resolution in dpi barely matters here. The platform sees pixels, so a 1600 px wide file is a 1600 px wide file whatever the dpi field says. A common working height is something like 2560 px per section (twice 1280), stitched together later, or one very tall canvas that you slice at the end.
Tip: Whatever width you pick, use one width for the whole episode. A panel built at 1000 px and pasted into an 800 px strip gets stretched or squeezed, and you will see it in the line weight.
Slicing a tall episode
An episode of ten sections at 1280 px each is 12,800 px tall, and you can keep it as a single long canvas while you work. At the end you cut it into slices of 1280 px or less. Clip Studio’s guides describe Webtoon accepting a larger image and splitting it itself, but they are a few years old, so check what the upload screen does with your files before you rely on it.
Cut where nothing important sits. A slice boundary through a face is invisible to readers because Webtoon stitches the images together, but it makes your files awkward to edit later. Slice in the empty space between scenes and name the files in order, with leading zeros (ep01_001.jpg, ep01_002.jpg) so that 10 does not sort before 2.
Panel spacing is your pacing
A printed page gives you a gutter of a few millimeters. A scroll gives you as much empty space as you like, and that space is how you control time. Webtoon’s own guidance, as quoted in a Clip Studio tutorial, is at least 200 px between panels at the 800 px width, and 600 to 1000 px when the location or time changes.
In practice: 200 px keeps a conversation moving. A 700 px gap reads as a pause or a cut to somewhere else. A very long gap before a full-width panel is the classic way to land a reveal, because the reader scrolls through blank space and then something arrives. If you want the print-side theory behind this, our guide to gutters and tier structure has a section on how gutters change in a digital scroll.
Make the text survive a phone screen
Your 800 px strip is shrunk to the width of the phone, so lettering that looks fine on your monitor can turn into smudges. A lettering tutorial on Clip Studio suggests a simple check: zoom out until the canvas on your screen is about as wide as a phone, then pick the smallest type size that still reads comfortably. Do that test on one page and reuse the size everywhere.
Keep bubbles a little way in from the left and right edges, so no letter sits right at the border once the strip is scaled to a phone. Placement is its own subject, covered in how to lay out speech bubbles in webcomics.
Thumbnail sizes
Webtoon Canvas asks for two series thumbnails before you can publish: a square one at 1080 × 1080 px under 500 KB and a vertical one at 1080 × 1920 px under 700 KB. Episode thumbnails are recommended at 202 × 142 px, also under 500 KB. All three accept JPG, JPEG or PNG. Some older guides list smaller figures, such as 440 × 440 or 160 × 151, and those are out of date. Webtoon’s help center is the page to trust, and it is worth rechecking when you publish.
Where BlankComic fits
BlankComic is a layout, lettering and export tool, not a full illustration program, and it is not an upload-prep tool either. What it does well for a webtoon is the planning stage. It includes a Webtoon vertical-scroll page preset and custom dimensions, you can drag and resize panels freely with rulers and guides, and you can add six types of speech bubble, including narration and caption. Export goes to PNG (up to 300 DPI), JPG, PDF or SVG, and the .blank project file keeps everything editable.
After exporting, open the file in any image viewer and read its pixel width. If it is not 800, resize it, then slice it with the tool you already use for drawing. Our export guide explains how resolution and format interact. If you draw on paper first, scan it using the steps in our guide to scanning hand-drawn comic pages, then import the art.
Try it: a three-beat strip in 15 minutes
Exercise
- Open the editor and choose the Webtoon page preset.
- Place three panels down the strip: a wide establishing panel, a close-up, and a full-width reaction. Leave a gap of about one panel height before the last one.
- Add one bubble to the close-up and a caption box to the first panel. Zoom out until the page is phone-width and check that you can still read both.
- Export a PNG, save the .blank file, then check the exported width and resize it to 800 px in an image editor.
You now have the full loop: layout, lettering, export, resize. Everything after that is drawing.
Making a print edition too? Print sizes are covered in the comic book page size guide.
Frequently Asked Questions
What is the standard webtoon canvas size in pixels?
For WEBTOON Canvas, images are 800 px wide and up to 1280 px tall per file. An episode is made of many such slices stacked into one vertical strip, and the total height can be much greater than 1280 px.
Can I make a webtoon canvas taller than 1280 px?
You can draw on a tall canvas, and most artists do. Slice it into pieces of 1280 px or less for upload, or check whether the upload screen splits large images for you.
Why draw at 1600 px if the upload is 800 px?
Drawing at double size keeps thin lines crisp after you shrink the art, and it avoids scaling anything up. Clip Studio’s tutorials recommend it for the same reason.
What DPI should a webtoon be?
The platform reads pixels, not dpi, so only the 800 px width matters for upload. Tutorials suggest a working resolution of around 350 dpi or higher for drawing comfort, but the final file does not need it.
How much space should I leave between webtoon panels?
Webtoon’s guidance, as relayed by Clip Studio, is at least 200 px between panels at 800 px wide, and 600 to 1000 px for a change of scene or time. Use bigger gaps for pauses and reveals.
Is the webtoon canvas size the same on other platforms?
Not always. Other webcomic platforms set their own widths and limits, so check the upload page of each one before you export a version for it.
Can I plan a webtoon in BlankComic?
Yes. The editor has a Webtoon vertical-scroll preset, free panel layout, speech bubbles and export to PNG, JPG, PDF or SVG. Final resizing to 800 px and slicing are done in another image editor.
Sources and further reading
Facts in this guide were checked against the following resources. All are free to read.
- WEBTOON Canvas, “800px wide and 1280px long” (creator format note): image size and 2 MB per file, 20 MB per episode. An older page; check the current upload screen.
- Clip Studio Tips, “How To Panel Comics For WEBTOON And Print”: working at 1600 px, minimum 200 px between panels, 600 to 1000 px for scene changes.
- Clip Studio Tips, “Starting Your Own WEBTOON: First Steps and Artist Tips”: doubling the canvas to 1600 × 2560 px and automatic resizing and splitting of larger uploads.
- Clip Studio Tips, “Letter Your Webtoon Like a Pro”: checking type size by zooming out to phone width.
- WEBTOON Canvas Help, “Designing Your Series & Episode Thumbnails”: current thumbnail sizes and file limits.