resize video for instagram reels

Setting a 9:16 target (for example, 1080 width by 1920 height) on horizontal footage does not crop into the frame to fill it edge-to-edge — it scales the entire horizontal video to fill the full 1080px width, then shrinks it vertically to fit, adding black bars on the top and bottom (letterboxing) since the video's own height ends up shorter than the tall target frame. The result is a technically correct 1080x1920 file, but with visible black bars above and below the footage rather than a full-bleed vertical video.

If a full-frame vertical video is what you actually want — no black bars, the frame filled edge-to-edge — that requires cropping into the original footage rather than fitting the whole frame inside a smaller box. The site's Crop Video tool is built for exactly that: you choose which region of the horizontal frame becomes your vertical crop, at the cost of losing whatever falls outside that selected region.

This resize tool is the right choice when you specifically want to preserve the entire original frame — nothing cropped out — even if that means black bars in the final vertical video. It's a legitimate stylistic choice some creators use deliberately (particularly for content where nothing in the frame can be safely cropped, like a wide shot with important detail near the edges).

If your source footage is already recorded vertically, or close to a 9:16 ratio, resizing to the Reels target will produce a clean result with little or no visible bar, since the shapes already roughly match.