Why the animations go missing
Most URL-to-video tools work in two steps: take one very tall screenshot of the page, then move a frame down it. That is fast and perfectly smooth, but the screenshot is a single moment. Anything driven by the scroll position, such as a heading that fades in as it enters the viewport, a parallax image, a section that pins and changes while you scroll, or a counter that ticks up, is frozen in whatever state it was in at that moment.
Depending on how the page was built, that state is one of three:
- Finished, which looks fine but static.
- Not started, which leaves blank gaps where sections should be, because elements waiting to fade in are still invisible.
- Half-way, caught mid-fade or mid-slide, which looks broken.


