Rotate Video · Fix Sideways Clips
Turn a sideways or upside-down video the right way up, or mirror it. MP4 and MOV videos turn in a second without re-encoding, even multi-GB phone videos, and keep their quality, recording date and location.
FFmpeg log
How to rotate a video
- Drop one or more videos onto the box above.
- Click Left 90°, Right 90° or 180° until the preview is upright. Mirror and Flip are there too.
- Click Rotate video and save the result. With several videos, the same turn is applied to all of them.
Why instant rotation loses nothing
Phones never actually film sideways. They record the picture the way the sensor sees it and store a small rotation setting (a display matrix) in the file that tells the player how to turn it. That's also why a video can look right on your phone and sideways somewhere else.
Instant mode rewrites just that setting: 36 bytes in a multi-gigabyte file. Nothing is decoded or compressed again, so the picture is bit-for-bit identical, the file stays the same size, and the recording date and GPS location stay where your photo app expects them. Most online rotators re-encode the whole video, which takes minutes, softens the picture and often drops the date, so the clip jumps to "today" in your gallery.
After rotating, the tool opens the new file in your browser and checks that it really plays in the new orientation before you save it.
When to re-encode
- The video is right on your phone or computer but sideways on a TV, in a video editor or on a website that ignores the rotation setting. Re-encoding with no extra turn bakes the current orientation into the pixels.
- You want to mirror a selfie video or flip it top to bottom. There is no reliable mirror setting, so this always re-encodes.
- The file is WebM, MKV, AVI or another format without a rotation setting.
Re-encoding uses H.264 at high quality (CRF 18), copies the sound when it can, and keeps the recording date and location. iPhone HDR videos are converted to standard dynamic range so the colours look right in every player.
Frequently asked questions
Does rotating lose quality?
Not in instant mode. The video and sound are copied byte for byte, so the quality, file size, date and location stay exactly the same.
Is there a file size limit?
Not for instant mode: a 4 GB phone video turns in about a second. Re-encoding has to fit in the browser's memory, which limits it to videos of roughly 400 to 700 MB, less for iPhone HEVC videos.
Is my video uploaded?
No. Everything happens in your browser tab. Instant mode does not even load the FFmpeg engine; it edits the file directly on your device.