Video Adjuster
Adjust video brightness, contrast, saturation & color temperature. Fix underexposed or washed-out footage. Enhance video quality with simple controls.
About Video Adjuster
Free Online Tool
Video Adjuster
Fix sideways footage, mirror a clip, or strip audio — rotate to 90°, 180°, or 270°, flip horizontally, and mute in one pass without re-uploading.
How to Use This Tool (30 Seconds)
- 1Upload Your Video: Click the upload zone and select your file. MP4, MOV, AVI, and WebM formats are all supported up to 500MB.
- 2Rotate if Needed: Select 90°, 180°, or 270° clockwise rotation to fix orientation. Each tap adds 90° — three taps reaches 270°.
- 3Flip Horizontally if Needed: Toggle the horizontal flip to mirror your footage. Useful for correcting front-camera recordings where text or logos appear reversed.
- 4Mute if Needed: Check the mute option to strip the audio track entirely from the output. The video stream is untouched.
- 5Download Your Adjusted Video: Hit 'Apply & Download.' All selected adjustments are applied in a single export pass — no quality loss from multiple processing steps.
How Rotation and Flip Are Applied
Rotation and flip are applied using a 2D affine transformation matrix on each video frame. Unlike metadata-only rotation flags (which some players ignore), this tool bakes the transformation directly into the pixel data:
// 90° clockwise rotation matrix
[0, 1, 0]
[-1, 0, w]
// Horizontal flip matrix
[-1, 0, w]
[0, 1, 0]
// Combined: flip + 90° applied in one pass
ctx.transform(-1, 0, 0, 1, width, 0) → ctx.rotate(Math.PI / 2)
Combining rotation and flip in a single matrix multiplication means the video is only re-rendered once — preventing the compounding quality degradation that occurs when applying transforms in separate export passes. Muting works independently by simply dropping the audio stream from the output container, leaving the video codec untouched.
Rotation & Flip — When to Use What
| Adjustment | What It Does | Common Cause | Output Dimensions |
|---|---|---|---|
| 90° Clockwise | Turns landscape into portrait | Phone held sideways (right) | Width ↔ Height swapped |
| 180° | Flips video upside-down | Camera mounted inverted | Width & Height unchanged |
| 270° Clockwise | Turns landscape into portrait (left) | Phone held sideways (left) | Width ↔ Height swapped |
| Horizontal Flip | Mirrors left-to-right | Front-camera selfie reversal | Width & Height unchanged |
| Mute | Removes audio track only | Background noise, copyright music | No dimension change |
⚡ Pro Tip
If your rotated video shows black bars on the sides after export, your media player is applying an additional rotation on top of the baked-in one — triggered by a leftover rotation metadata flag in the original file. Fix this by stripping the metadata tag during export. This tool handles it automatically, but if you're using FFmpeg manually, add -metadata:s:v rotate=0 to your command to clear the stale flag and prevent double-rotation on any player.
Frequently Asked Questions
Q: Why does my rotated video still appear sideways on some devices?
Some players read a rotation metadata flag embedded in the file and apply it visually, ignoring the actual pixel orientation. This tool bakes rotation into the pixel data and clears the metadata flag — the output plays correctly on all players, browsers, and platforms.
Q: Does rotating a video reduce its quality?
Rotating using a pixel-level transform requires re-encoding the video frames, which introduces minor quality loss with lossy codecs like H.264. To minimize this, always start from the highest quality source. The tool applies all adjustments in a single pass to avoid stacking losses.
Q: What is the difference between 90° and 270° rotation?
Both turn a landscape video into portrait orientation, but in opposite directions. Use 90° clockwise when your phone was tilted right during recording and the footage appears rotated left. Use 270° when the phone was tilted left and footage appears rotated right.
Q: Can I flip a video vertically using this tool?
This tool supports horizontal flip only. For a vertical flip (upside-down mirror), use the 180° rotation option instead — it achieves the same visual result as a vertical flip for most footage.
Q: Does muting a video affect the video stream or file size significantly?
Muting only drops the audio stream — the video codec, resolution, and bitrate are completely untouched. File size reduction depends on the audio bitrate, typically saving 5–15% of total file size for standard recordings.
Q: Can I rotate and flip and mute all in the same export?
Yes. All three adjustments — rotation, flip, and mute — are applied simultaneously in a single processing pass. You never need to export multiple times, which protects quality and saves time.
Q: Why do 90° and 270° rotations change the video's output dimensions?
Rotating 90° or 270° swaps the video's width and height. A 1920×1080 landscape video becomes 1080×1920 after a 90° rotation. This is correct behavior — the frame is now portrait-oriented. Platforms like Instagram and TikTok will display it natively as vertical content.