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FFmpeg does re-encode the cropped area, but MiOffice uses high-quality H.264 settings so the output looks virtually identical to the original.

Set the crop width and height to the actual content area and adjust the X/Y offsets to skip the bars. A 1920x1080 video with 140px bars on each side would be cropped to 1640x1080 with X offset 140.

Up to 500MB. Processing happens in your browser via FFmpeg WASM, so larger files take longer depending on your device.

Yes. Calculate the pixel dimensions for your target ratio and enter them. For 9:16 from a 1920x1080 source, use 607x1080 with the appropriate X offset.

Yes, it works on any modern browser including Chrome and Safari on iOS/Android. Larger files may be slower on phones with less RAM.

No. By default, FFmpeg runs via WebAssembly in your browser. On some devices, processing may use our secure server.

MP4, WebM, MOV, AVI, and MKV. The output is always MP4 with H.264 encoding for universal compatibility.

Enter your width, height, and X/Y offset values. The crop applies to those exact pixel coordinates. Tip: use a screenshot tool to measure the area you want to keep.

Depends on file size and device. A 100MB video typically takes 30-90 seconds on a modern laptop. FFmpeg WASM is about 3-5x slower than native FFmpeg.

For social media formatting, try our dedicated Resize for TikTok/Reels tool which handles aspect ratios automatically. Use Crop for precise manual control.