MP4 Cropper
Crop MP4 files online in your browser. Choose 9:16, 16:9, 1:1, 4:5 and export a cropped MP4 privately.
Drop your video here
or click to browse
MP4, MOV, AVI, MKV, WebM, WMV, FLV and more · up to 2 GB
Crop Preview
Aspect Ratio
Crop Position
Output Quality
MP4 is the most common video format for phones, cameras, screen recorders, and social platforms. The MP4 Cropper preset starts with a square crop because square previews are common for social posts, thumbnails, and product videos, but you can switch to any ratio before export.
Related Use Cases
Crop Video Online — Remove Black Bars and Fit Social Media Ratios
Zolkit's Video Cropper crops video files entirely in your browser. Upload MP4, MOV, AVI, MKV, or WebM footage, choose a ratio like 9:16 for TikTok, 16:9 for YouTube, 1:1 square, or 4:5 for Instagram, and preview the exact output frame before exporting. The tool crops the picture area of the video, not the duration, and your file never leaves your device.
Private Browser Processing
Your video is processed locally with FFmpeg WebAssembly. No upload, no cloud storage, and no server-side queue.
Social Ratio Presets
One-click crops for 9:16, 16:9, 1:1, 4:5, 5:4, 4:3, and 21:9 cover the most common social and presentation formats.
Live Crop Preview
Preview the final frame before processing so faces, text, and products stay inside the crop area.
Crop Anchor Control
Use a 3×3 position grid to keep the top, bottom, left, right, or center of the original frame.
MP4 Export
Exports a standard H.264 MP4 that works on TikTok, Instagram, YouTube Shorts, iPhone, Android, and desktop players.
Free, No Watermark
Crop and download your video without signing up, installing software, or adding a watermark.
How to Crop a Video Online
- 1
Upload your video by dragging it onto the page or clicking to browse.
- 2
Choose an aspect ratio and crop position, then check the live preview and output dimensions.
- 3
Click Crop Video, wait for processing, then download the cropped MP4.