Why does my sideways video play correctly in one app but sideways in another?

Many phones and cameras don't rotate the actual video frames — they store the video as recorded and add a rotation flag in the file's metadata telling a compliant player to display it rotated. Players and tools that honor that flag show it upright; those that ignore it show the raw sideways footage. This tool rotates the actual pixel data, so it displays correctly everywhere.

Why does rotating take longer than some other conversions on this site?

Because rotating pixels requires decoding every frame, transforming it, and re-encoding it as new compressed video — unlike a stream-copy remux that just moves compressed data between containers without touching it. That decode/transform/encode cycle is inherently more CPU-intensive.

Is there a way to rotate without re-encoding, to avoid any quality change?

Not for a genuine pixel rotation — transforming the actual frame content always requires decoding and re-encoding. Some tools can only flip a rotation metadata flag without re-encoding, but that approach doesn't guarantee correct playback in players that ignore rotation metadata, which is the exact problem this tool avoids.

What's the difference between 180° rotation and horizontal flip?

180° rotation turns the video upside down and reverses left-right, as if the camera had spun a half-turn. Horizontal flip mirrors the image left-to-right without changing which way is up — useful for footage that needs a mirror correction rather than a full spin.

Will rotating my video lose noticeable quality?

The re-encode uses CRF 23, a setting that targets visually consistent quality with the source for typical viewing. Some generational loss is inherent to any re-encode, but at this setting it's generally not perceptible without close inspection.

Can I rotate a video that has correct rotation metadata but I just want it flipped for creative reasons?

Yes, the tool applies the transform you choose regardless of what metadata the source file carries — it doesn't try to detect or correct existing rotation flags, it applies whatever rotation or flip you select.

Does the aspect ratio change after a 90° rotation?

Yes, necessarily — rotating 90° or 270° swaps width and height, so a 1920x1080 landscape video becomes 1080x1920 portrait, and vice versa. 180° rotation and horizontal flip keep the original dimensions.

What formats can I upload for rotation?

MP4, MKV, AVI, MOV, and WebM are all accepted; the corrected output is always saved as MP4 for broad compatibility.

Will the audio be affected by rotating the video?

No, the audio track passes through re-encoded as AAC alongside the rotated video, with no change to its content or timing.

Can I preview the rotation before committing to the full export?

Yes, a preview shows the corrected orientation in the browser before you run the full rotate-and-download process, so you can confirm you picked the right direction before waiting for the export.

All ToolsRotate Video

Rotate Video

Rotate videos 90°, 180°, 270° or flip — browser-based, no upload needed.

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Rotate Video

Processing…

Processed on your device

What is Rotate Video?

Rotate Video turns sideways or upside-down footage the right way up by physically transforming the pixel data — rotating 90° clockwise, 90° counter-clockwise, 180°, or flipping horizontally — and re-encoding the result as H.264. This is deliberately different from what a lot of players and editors do when a video looks sideways: many phones and cameras don't actually rotate the recorded frames at all, they just write a rotation flag into the file's metadata (an atom in MOV/MP4 called the display matrix) telling a compliant player "render this 90° rotated." Software that respects that flag shows the video upright; software that ignores it — plenty of older media players, some web embed players, and various editing and transcoding tools — shows it sideways, because the actual stored pixels never moved.

That metadata-flag inconsistency is exactly why a real pixel-level rotation is often the more reliable fix than trying to set the flag correctly. Once this tool rotates the actual frame content, every player shows it upright regardless of whether that player pays attention to rotation metadata at all — there's no flag to misinterpret because the pixels themselves are now stored in the corrected orientation. The trade-off is that this requires a genuine re-encode rather than a stream copy: FFmpeg has to decode every frame, apply the transpose (or combination of transpose operations for 180°) or hflip filter, and recompress the rotated frames as new H.264 video. That's inherently more computationally expensive than copying compressed data, which is why rotation takes measurably longer than, say, a container remux — the CPU has to actually touch every pixel of every frame.

The specific filters matter here: transpose=1 rotates 90° clockwise, transpose=2 rotates 90° counter-clockwise, and 180° is achieved by chaining two 90° transposes together (there's no single "transpose 180" operation in FFmpeg's video filter graph, so two quarter-turns compose into a half-turn). Horizontal flip uses a separate hflip filter that mirrors the frame left-to-right without changing its rotation at all — useful for footage recorded through a mirror, from a front-facing camera that wasn't corrected, or footage that needs to match the orientation of an interview subject sitting across from the camera.

Because the output is re-encoded rather than remuxed, it comes out at CRF 23 — a quality-targeted H.264 setting that's visually consistent with the source for normal viewing, meaning you're not trading away noticeable quality just to fix the orientation. Audio passes through re-encoded as AAC alongside the corrected video. Everything runs locally through FFmpeg WebAssembly, so a personal video that happens to be recorded sideways never needs to touch a server just to get flipped the right way up.

How It Works

FFmpeg decodes every frame of the source video and applies a transpose filter (for 90° rotations), a chained double-transpose (for 180°), or an hflip filter (for horizontal mirroring), then re-encodes the transformed frames as H.264 at CRF 23 with AAC audio. Because this changes the actual pixel data rather than a metadata flag, the correction is guaranteed to display correctly in any player, but the trade-off is a real re-encode: processing time scales with the video's resolution and length rather than finishing instantly the way a stream-copy operation would.

How to Use

1
Upload your video
Drop a video file onto the upload zone — the tool supports MP4, MOV, MKV, AVI, and WebM formats.
2
Choose the rotation angle
Select 90° clockwise, 90° counter-clockwise, 180°, or horizontal flip based on which way the footage needs to turn.
3
Preview the correction
A preview shows the corrected orientation so you can confirm it's right before processing the full file.
4
Click Rotate & Download
FFmpeg decodes the video, applies the chosen transform to every frame, and re-encodes the result as H.264.
5
Wait for the re-encode
Because this is a genuine transcode rather than a stream copy, processing time depends on the video's resolution and length.
6
Download the corrected video
Save the output — it plays upright in every player since the pixel data itself has been rotated, not just a metadata flag.
7
Rotate more files as needed
Repeat for any additional clips that need orientation correction.

Who Uses This Tool

📱

Fixing Rotation-Flag Playback Bugs

Correct footage that shows sideways in some players despite looking fine in others — a classic symptom of a rotation metadata flag being ignored.

🎬

Portrait-to-Landscape for Presentations

Rotate a vertically filmed phone clip so it fits properly into a widescreen slide deck or presentation template.

🔧

Upside-Down Rig or Mount Footage

Correct video captured from a camera that was physically mounted upside-down on a drone, helmet rig, or security bracket.

🎥

Dashcam & Security Footage

Fix the orientation of dashcam or CCTV recordings that were saved sideways due to how the camera was physically installed.

🪞

Mirror-Recorded Clips

Apply a horizontal flip to footage recorded through a mirror or from a front-facing camera that needs to match natural viewing orientation.

📤

Pre-Upload Orientation Fix

Correct rotation before uploading to YouTube, Instagram, or TikTok so the platform's player doesn't misinterpret the file's orientation.

Why Choose This Tool

Fixes the Pixels, Not Just a Flag

Because the actual frame data is rotated, the video displays correctly in every player, regardless of whether that player respects rotation metadata.

Four Precise Transform Options

Choose 90° clockwise, 90° counter-clockwise, 180°, or horizontal flip depending on exactly how the source footage is oriented.

CRF 23 Visual Quality Target

The re-encode targets visually consistent quality with the source, so correcting orientation doesn't introduce noticeable degradation.

Audio Stays Intact

The audio track is preserved and re-encoded as AAC alongside the corrected video, with no change to its content.

Fully Local Processing

FFmpeg WebAssembly performs the rotation inside your browser tab — footage is never uploaded to a server.

Free, No Watermark

Free with no account for standard file sizes; sign up free for 80 MB or go Pro for 250 MB — output is never watermarked.

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Key Benefits

Physically transforms pixel data instead of relying on a metadata flag
Displays correctly in every player, regardless of rotation-flag support
90° clockwise, 90° counter-clockwise, 180°, and horizontal flip options
CRF 23 re-encode keeps quality visually consistent with the source
Fixes footage recorded sideways or with an upside-down camera mount
Browser-based — your video is never uploaded to a server
Accepts MP4, MKV, AVI, MOV, and WebM as input
Free with no watermark added to the corrected video

Frequently Asked Questions

Also Known As

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