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Elixuvo

Video Resizer & Resolution Changer

Resize and scale MP4, WebM, MOV, and AVI videos directly in your browser using FFmpeg WebAssembly. Convert to 1080p, 720p, 480p, 360p, or custom dimensions with zero server uploads.

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How to use this tool

  1. Upload or drag and drop your video file (MP4, WebM, MOV, AVI, or MKV) into the resizer workspace.

  2. Select a resolution preset (1080p, 720p, 480p, 360p) or specify custom width and height.

  3. Toggle 'Aspect Ratio Lock' to keep original proportions and prevent video stretching.

  4. Inspect the before-and-after resolution and pixel count comparison card.

  5. Click 'Resize Video' to render the scaled video locally using WebAssembly Lanczos interpolation.

  6. Preview the resized video in the playback player and download it directly to your device.

Frequently asked questions

Quick answers about file privacy, processing modes, formats, and device support.

The tool applies FFmpeg's Lanczos scaling algorithm inside an in-browser WebAssembly sandbox. Lanczos resampling uses high-order sinc interpolation to preserve edge contrast and text clarity during downscaling or upscaling.
Standard H.264 video compression uses the YUV420p chroma subsampling format, which groups color data in 2x2 pixel blocks. Dimensions must be even numbers to prevent encoder errors and green-line rendering artifacts.
Never. Video resizing is executed 100% locally on your computer inside your browser's WebAssembly sandbox. Your files are never transmitted across the network or stored on any server.
No. Our engine uses stream copy mode (-c:a copy) to preserve the original audio stream bit-for-bit without any re-encoding whenever container compatibility allows.
You can resize MP4, WebM, MOV, AVI, and MKV video files. The output file is formatted with FastStart streaming headers for instant online playback.

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