Aspect ratios and platforms

Three shapes, set under Settings → Output.

Aspect	Output size	Where it goes
16:9	1920 × 1080	YouTube, an embedded video, a presentation
9:16	1080 × 1920	Shorts, TikTok, Reels, Stories
1:1	1080 × 1080	Square feeds

Switching is safe

Everything is stored relative to the frame — text size, overlay offsets, padding, the caption band. Switching aspect reflows the composition rather than cropping it, so a project can be exported in two shapes without being rebuilt.

What does change is how much chart fits comfortably. A 60-candle chart that reads well at 16:9 is cramped at 9:16, because the same candles now share a third of the width.

Building for vertical

Three things are worth doing deliberately:

Fewer candles. Vertical has less horizontal room, and candle bodies get thin fast. The editor warns when they cross the point of being unreadable, using the same width formula the renderer uses.

Use camera shots. On vertical, a wide chart that stays wide is unreadable throughout. Zooming into the part being discussed is not a flourish there, it is the only way to make the chart legible.

Turn on the safe-area outlines before positioning your title and caption band. The platform will draw its own interface over the top and outside gutters.

Building for 16:9

The opposite problem: there is enough room that a static fit-all framing works for the whole video, and camera moves become optional. Use them for emphasis rather than for legibility.

Titles can sit lower, because nothing is covering the bottom of the frame.

One project, two exports

The usual workflow is to build at 16:9, export it, then switch to 9:16, adjust the title position and add a shot or two, and export again. Both files come out of the same project.

Undo works across the switch, so a bad reflow costs nothing.