Aspect Ratio Converter
exact crop windows and frame loss

Below about 40 percent frame loss a single static crop usually works. Above it, subjects drift out of frame and a static crop starts decapitating people, so you need per-shot keyframed reframing or a different composition strategy such as split-screen stacking.

Running this calculation before a shoot is more useful than after: it tells you whether to shoot 4K, frame centrally, or capture a dedicated vertical angle.

Cropping 1080p to 9:16 leaves 608 pixels of width, below the 1080 needed for vertical delivery, so the result is upscaled and soft. Cropping 4K leaves 1216 pixels — above delivery resolution, with room to reframe.

If you only upgrade one thing about your capture, make it shooting the primary camera in 4K. It converts your entire archive into vertical-ready material.

Converting 16:9 to 9:16 discards roughly two thirds of the horizontal frame. Automated centre-cropping works only when the subject is centred and static — which describes almost no real footage. Interviews framed with the speaker on a third, two-handers, screen recordings and anything with on-screen text all break under a naive crop.

The manual approach is to keyframe the reframe so the crop follows the subject, and to accept that some shots simply cannot survive the conversion. A wide two-shot has no vertical version; the honest answer is to cut to a single or replace the shot rather than to squeeze both faces into a 1080-pixel width.

Screen recordings are the hardest case. Rather than cropping, we rebuild them: the relevant region is scaled up and repositioned per beat, which usually means the vertical version has a different edit structure than its horizontal parent.

Platform interface elements sit on top of your frame, and they differ by surface. Bottom-third overlays for captions, handles and CTAs, plus a right-hand column of action buttons, are the two that most often eat content. Design the vertical version with the lower 18 to 22 percent and the right 12 percent treated as unusable for anything load-bearing.

Titles placed in the true vertical centre survive every surface. Titles placed for a 16:9 lower third do not survive any of them.

If the same asset ships to multiple surfaces, build one master with generous safe margins rather than four bespoke versions — the version count is where quality control usually fails.

Cropping a 1080p horizontal frame to vertical leaves roughly 608 pixels of width, which is then upscaled to 1080. That upscale is visible on faces and text. Shooting 4K and delivering 1080 removes the problem entirely and is the single highest-return change most teams can make to their capture setup.

Where 4K source is not available, keep the upscale under 1.5x and add a light sharpen pass rather than relying on the encoder. Above 1.5x, reframing tighter on the subject usually looks better than preserving the original composition at low resolution.