Video Cropper & Region Cutter

Crop and resize MP4, WebM, MOV, and AVI videos directly in your browser using FFmpeg WebAssembly. Convert to 9:16 vertical, 1:1 square, or custom framing with zero server uploads.

Live

MP4
MOV
WEBM
AVI
MKV

🔒 100% Local Processing — Video cropping executed entirely in your browser WebAssembly sandbox. Nothing is ever uploaded.

Crop and resize MP4, WebM, MOV, and AVI video frames directly in your browser. Choose preset aspect ratios (9:16 for Reels/Shorts, 1:1 Square, 16:9, 4:5) with live visual bounding box and 100% privacy.

Drag and drop your mp4, mov, webm, avi, or mkv videos here

One file to begin. It is handled for this request and not retained.

Social Media Aspect Ratios

Quickly convert landscape YouTube or DSLR footage (16:9) into vertical clips (9:16) for TikTok, Instagram Reels, and YouTube Shorts.

100% In-Browser Privacy

Video cropping happens inside your local WebAssembly sandbox. Private camera footage or corporate presentations are never sent to external servers.

Audio Stream Preservation

The video frames are recut without touching or re-encoding the audio track whenever container compatibility allows, maintaining 100% sound quality.

How to use this tool

Upload or drag and drop your video file (MP4, WebM, MOV, AVI, or MKV) into the cropper workspace.
Select an aspect ratio preset such as 9:16 for TikTok/Reels/Shorts, 1:1 for Instagram square, or Custom.
Adjust the interactive X and Y position sliders or use 'Re-center Crop Box' to align your subject.
Inspect the cyan crop bounding box directly overlaid on the live playback player.
Click 'Crop Video' to render the cropped video locally in your browser WebAssembly engine.
Preview the final cropped video and download it directly to your device.

Frequently asked questions

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

The tool uses FFmpeg's geometric crop filter inside an in-browser WebAssembly sandbox to slice video frames to your exact pixel dimensions and offsets (crop=w:h:x:y) with ultrafast H.264 rendering.

No. Our engine uses stream copy mode (-c:a copy) to preserve the original audio track completely without any re-encoding or quality loss.

Never. Video cropping is performed 100% locally on your computer inside your browser's WebAssembly sandbox. Files never leave your device.

Yes! Select the '9:16' preset, align the crop box over the focal point of your video, and click Crop Video to create vertical clips formatted for mobile platforms.

You can crop MP4, WebM, MOV, AVI, and MKV video files. The output file retains web-optimized FastStart streaming flags.

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