Webtoon Vertical Panel Format Guide — Sizes, Spacing & Flow

Vertical scroll comics don't just stack manga panels on top of each other. The scroll is the pacing tool: the space between panels controls time, tension, and reveals. This guide covers the technical specs platforms expect and the formatting habits that make an episode feel professional.

If you want to build the panels themselves with AI, start in the Gootaku studio or the dedicated webtoon creation flow — this guide focuses on how to assemble them.

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The standard webtoon canvas sizes

Most platforms converge on the same dimensions:

• Width: 800 px is the de facto standard (Webtoon Canvas requires it). Design at 1600 px wide and export at 50% for crisp lines on retina screens.
• Episode height: platforms accept long strips, but slice uploads into chunks — Webtoon Canvas caps each image at 1280 px tall and 2 MB, with up to 100 images per episode.
• Safe margins: keep text and faces at least 60–80 px from the left and right edges. Phones clip less than you think, but thumbs cover more.

A typical episode is 60–90 panels' worth of vertical space, which usually means 15,000–25,000 px of total scroll height.

Panel spacing is your pacing

In print manga, the gutter is fixed. In a webtoon, you choose how long the reader travels between beats:

• Tight spacing (50–150 px): fast conversation, action chains, comedic rhythm.
• Medium spacing (300–600 px): scene transitions, a beat of silence.
• Huge gaps (800–1500 px of near-empty space): dread, anticipation, the pause before a reveal. The scroll itself becomes the page turn.

The single most common beginner mistake is uniform spacing — it flattens every scene to the same tempo. Vary it deliberately, the way you'd vary panel composition in a print layout.

Composing panels for a narrow strip

• Favor vertical and square panels. Wide cinematic frames shrink to unreadability at 800 px. When you need an establishing shot, make it tall — let the reader scroll down a building or landscape.
• One idea per panel. Vertical readers move fast; dense multi-action panels get skimmed.
• Faces and hands carry the story. Close-ups read far better on phones than full-body wides.
• Direct the eye downward. Diagonals, falling motion lines, and gaze direction should pull toward the next panel, not sideways.

When generating panels with an AI webtoon generator, prompt for portrait aspect ratios and close framing — you'll waste far fewer generations.

Text and bubbles in vertical format

• Keep bubbles inside the center 70% of the strip width.
• Font size: 28–36 px at 800 px width — smaller than that fails on older phones.
• Break long dialogue across consecutive panels instead of one wall of text; the scroll makes multi-bubble exchanges feel natural. Our speech bubble design guide covers shapes and tails in detail.

Color, tone, and file discipline

Vertical scroll platforms are overwhelmingly full color — flat cel shading with one light source reads best at phone size (see color theory for webtoons). Export as PNG for line-heavy art or JPG at 90% quality for painterly panels, and always preview the sliced episode on an actual phone before publishing.

A practical workflow with AI panels

1. Script the episode as a beat list — one line per panel.
2. Generate character-consistent panels in Gootaku, keeping characters consistent across panels with a saved character.
3. Assemble panels on an 800 px-wide canvas and set spacing per beat: tight for dialogue, huge before the cliffhanger.
4. Add bubbles and SFX last, checking every element against the center-safe zone.
5. Slice, upload, and publish — our guides to Webtoon Canvas and Tapas walk through both platforms.

End every episode on an unresolved beat — the cliffhanger guide has ten patterns that work in vertical format.

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FAQ

What size should a webtoon panel be?

Work at 800 px wide (or 1600 px and downscale). Individual panel height is flexible, but each uploaded image slice should be at most 1280 px tall on Webtoon Canvas. Keep text inside the central 70% of the width.

How long should a webtoon episode be?

Most successful episodes run 40–90 panels, roughly 15,000–25,000 px of scroll. Shorter than 30 panels feels thin for weekly readers; longer than 100 becomes hard to sustain on a schedule.

Can I convert manga pages into webtoon format?

Yes, but don't just crop pages into strips. Re-sequence panels into a single column, enlarge faces and key actions, and re-space gutters for scroll pacing. The differences are covered in manga vs comic vs webtoon.

Can AI generate webtoon-ready panels?

Yes — generate panels in portrait ratios with consistent characters, then assemble and letter them yourself. Gootaku's studio is built for exactly this panel-by-panel workflow.