Local Processing · FFmpeg WASM · No Upload
Video Rotator
Rotate browser-decodable videos 90°, 180°, or 270° clockwise. Fix sideways phone recordings or upside-down videos — all processed locally in your browser without sending the video to a processing server.
video-rotator v2.0
1 Rotation angle
The video preview above rotates in real-time as you select an angle. Click Rotate Video to process and download the result.
Show rotation log
Rotate any video in four steps
Upload, pick an angle, rotate, download. Your video is processed locally in the browser.
Upload video
Drop a file up to 10 MB. It is read from a local object URL, never uploaded.
Pick rotation
90° CW, 180°, or 270° CW. The preview rotates instantly so you can check.
Process
FFmpeg re-encodes with the transpose filter for accurate pixel rotation.
Download
Preview the rotated result and download the MP4 file.
Precision, privacy, and predictability
What the rotator does with your video — and what it deliberately does not.
Zero upload
FFmpeg WASM runs in a worker inside your browser. Your uploaded video is processed locally and is not sent to a video-processing server.
Transpose filter
FFmpeg's transpose filter rotates pixels accurately. Output dimensions swap automatically (1920×1080 → 1080×1920).
Live preview
CSS transforms rotate the preview instantly so you can verify the angle before processing.
What it does, and what it does not
Clear boundaries so you know when to reach for another tool.
What it does
- Rotate any browser-decodable video up to 10 MB.
- 4 rotation options: 90° CW, 180°, 270° CW, no rotation.
- Live CSS preview before processing.
- Correctly rotates the frame and swaps width/height for 90° and 270° rotations.
- Export MP4 with H.264 video, AAC audio, and the faststart flag.
- Process videos locally after the FFmpeg engine has loaded.
What it does not
- Handle files above 10 MB — browser memory is the ceiling.
- Flip or mirror videos (horizontal/vertical reflection).
- Crop or resize videos (use dedicated tools for that).
- Output formats other than MP4 in this tool.
Common issues and fixes
Quick answers to common Video Rotator problems.
Engine won't load
The FFmpeg WASM engine needs WebAssembly and Web Workers, and its files must not be blocked. Exclude ffmpeg from JS minify/combine/delay in optimisation plugins, or self-host the engine files.
Rotation fails on long videos
Re-encoding happens in browser memory. Near the 10 MB cap or with long durations, expect more failures. Use a desktop tool for heavy jobs.
Output has black bars
Black bars can appear when the source video or its display aspect ratio leaves unused space after rotation. The tool preserves the rotated frame rather than stretching the video.
Processing is slow
Rotation requires full re-encoding because the pixel grid changes. The tool uses veryfast preset for reasonable speed on most devices.
Frequently asked questions
Honest answers about the Video Rotator.
Is my video uploaded to a server?
No. The FFmpeg WASM engine runs entirely in your browser. Your video is read from a local object URL, rotated in memory, and never transmitted to AllInOneTools or any third party.
Which rotation options are available?
90° clockwise, 90° counter-clockwise (270° CW), 180°, and 270° clockwise (90° CCW). These cover all standard orientation corrections for videos recorded sideways or upside-down.
Does rotation affect video quality?
Rotation requires re-encoding because the pixel grid changes. The output is re-encoded with H.264 at CRF 23, which is intended to preserve good visual quality while keeping processing practical.
Can I preview the rotation before processing?
Yes. After selecting a rotation angle, the source video plays with a CSS transform applied so you can see exactly how it will look. The actual rotation happens when you click the button.
What is the output format?
MP4 with H.264 video and AAC audio, plus the faststart flag for smooth web playback. The rotated video has swapped dimensions (e.g., 1920×1080 becomes 1080×1920 for 90° rotation).
Why is there a 10 MB limit?
Re-encoding happens entirely in browser memory. The 10 MB input limit helps reduce memory pressure, especially on devices with limited resources. For larger files, use a desktop tool like ffmpeg, HandBrake, or Shutter Encoder.