Native vertical, not cropped landscape
Many tools make a vertical video by cropping a widescreen one: the middle slice of a desktop page, with text too small to read. Choosing 9:16 here changes what is filmed. The camera opens your page in a phone-sized viewport, so it records your real mobile layout — the stacked cards, the mobile menu, the buttons a thumb would tap — and every scene is framed for a phone held upright.
That is also why the page matters. If your site's mobile layout is weak, the vertical film shows it, so look at the page on your own phone before you film it.
Sound off, captions on
Feeds start muted, so for many viewers the captions are the script. They are written from the narration, timed to the voice word by word in one of 5 styles, and burned into the MP4, so they survive any upload; a separate subtitle file comes with every film for the platforms that take one. If they drift after you edit the script, re-timing them against the existing voice is free once after each paid render.
Keep the opening line short and concrete. It is the caption that decides whether the next one is read.
Cutting rhythm and length
Vertical feeds reward pace. The tiktok_punchy edit style, one of 4, cuts hard throughout, punches in on a scene marked as a problem or a win, slides every few scenes and swipes on the closing beat.
The narration sets the length: a scene lasts as long as the words spoken over it, and you can ask for anything from 15 to 180 seconds. For a promotional clip, the ad goal's default of 20 to 30 seconds is a sensible start; a vertical how-to can run longer, because its viewer chose to watch it.
Variants, posting, and what stays in the app
The platform decides which version works, so make several. Rewrite the opening scene and render again: five openings on the same body cost five re-renders (200 credits), not five productions. The same storyboard also renders in 1:1 and 16:9 for the other placements.
PageToVid posts nowhere: you get the MP4 and upload it yourself. Trending sounds have to be added in the platform's own editor, and that is the one step worth doing there. The guides how to make a TikTok from a URL and how to make vertical videos for TikTok and Reels go further, and what is a social media video covers the formats.