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How Flip Video Works

Flipping a video is a pixel-plane mirroring operation: every frame is redrawn with its pixel columns (for a horizontal flip) or rows (for a vertical flip) reversed in order. Technically, this tool draws each decoded video frame onto an HTML canvas using a negative scale transform — ctx.scale(-1, 1) for horizontal, ctx.scale(1, -1)for vertical — which flips the coordinate system before the frame is painted. The canvas output is then captured as a live stream and recorded frame by frame into a new video file. It's the same transform a photo editor applies to a still image, just repeated for every frame of the clip in real time.

It's worth being precise about what flipping is not: it is not the same as rotation. A 180° rotation spins the entire frame around its center point, so what was in the top-left ends up in the bottom-right. A vertical flip only swaps top and bottom while left and right stay put; a horizontal flip only swaps left and right while top and bottom stay put. Applying both a horizontal and a vertical flip in sequence produces the same visual result as a 180° rotation, but a single flip alone does not.

The most common real-world need for this is correcting front-camera recordings. Many phones show a mirrored preview while recording — so the video looks natural to the person filming — but save the actual file un-mirrored, which means any text, a watch face, or handwriting the person holds up reads backwards in the saved clip. A horizontal flip corrects that instantly. Editors also use flipping deliberately: mirroring a clip to create a matched pair of shots, reversing a subject's direction of travel so two cuts feel continuous, or building a symmetric visual effect. In the /video-tools/ set, flip pairs naturally with Rotate Video — reach for rotate when the whole frame is sideways or upside down, and flip when the issue is a mirrored or reversed orientation rather than a rotated one.

Because the transform only touches the visual plane, the audio track is copied through unchanged — flip never affects sound, sync, or duration. As with any browser-based export, the output video is re-encoded through the recording pipeline, so there's a small, generally imperceptible re-encoding pass on top of the mirrored frames.