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How Video Cropping Works

Cropping a video means defining a rectangular region within each frame and discarding everything outside it — the opposite of resizing, which scales the whole frame without removing any content. This tool decodes your video, draws each frame onto a Canvas, extracts only the pixels inside your chosen crop rectangle, and re-encodes that smaller region as the new video through the MediaRecorder API. The result is a video with a different aspect ratio and typically a smaller resolution than the source, since you've physically removed pixel data rather than compressing it.

The most common reason to crop video today is repurposing footage for short-form vertical platforms. Content shot in standard 16:9 widescreen doesn't fit a 9:16 vertical feed without either letterboxing (adding black bars, which wastes screen space) or cropping (cutting the sides to fill the frame). Cropping to 9:16 for Reels or TikTok, 1:1 for square feed posts, or a custom rectangle for a specific composition are all the same underlying operation with different target dimensions. It's a fast way to get one piece of footage working across multiple platforms without re-shooting.

Crop works well alongside a couple of adjacent tools. If your goal is to change the overall pixel dimensions of a video without cutting any content out — for example scaling a 4K file down to 1080p — that's what Resize Video does instead. And if the footage needs both reframing and trimming to a shorter duration, doing the crop first keeps the file smaller for the trim step, since there's less pixel data to process either way.

A key technical limitation worth knowing: the crop rectangle in this tool is static across the entire clip — it doesn't follow a moving subject frame by frame the way professional editing software with motion tracking can. For a subject that stays roughly centered, a static crop works well. For a subject that moves significantly across the frame during the clip, you'll want to choose a wider crop region that keeps them in view throughout, rather than a tight crop that risks cutting them out partway through.