Rotate videos by 90, 180, or 270 degrees and flip horizontally or vertically.
Video plays back exactly as its pixels are arranged, so footage recorded with the phone held sideways comes out sideways. This page loads a clip, applies a single whole-file transform - a 90, 180, or 270 degree rotation, or a horizontal or vertical flip - and returns a new file that is already reoriented. The common surprise is dimensional: a quarter-turn swaps the width and height, so a 1920x1080 landscape clip comes back as 1080x1920 portrait, while 180 degrees leaves the dimensions alone.
A concrete input and expected output from the current implementation.
Input
phone-clip.mp4, recorded sideways. Load the file and choose rotate 90 degrees clockwise.
Expected output
A new 1080x1920 (portrait, 9:16) video of the same clip that plays upright. Duration, frame rate, and number of frames are unchanged; only the pixel grid is turned.
A 90-degree rotation transposes the frame, so the 1920x1080 landscape dimensions swap to 1080x1920. Rotation repositions every pixel but keeps the timeline and frame rate intact.
Each frame is a grid of pixels, and a rotation moves every pixel to a new grid position. A 90-degree turn swaps width and height, so a 1920x1080 frame becomes 1080x1920; a 180-degree turn keeps the dimensions and points each pixel at the opposite corner - the same picture as a horizontal flip followed by a vertical flip. The page writes one new file with the transform on every frame; the source file is untouched.
A horizontal flip mirrors the picture left to right, like a mirror image; a vertical flip mirrors it top to bottom. Neither changes the frame's dimensions. Text that reads correctly before a flip reads backward after it, and after a 180-degree rotation it reads upside down. Two flips on the same axis cancel out, and four quarter-turns return to the original picture - a useful sanity check when a clip comes back looking wrong.
Rotating writes a new file, so the frames are encoded again, and re-encoding always loses a little quality. Expect a small generational loss and a file size that can differ from the original, either larger or smaller. For a clip that only needs to play upright, the loss is usually invisible; keep the original until you are satisfied with the result.
No. The rotation or flip you choose is applied to the whole clip, every frame from start to end. To reorient a single scene, cut that segment out first, rotate it separately, and join the pieces back together; this page only works on the entire file.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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