Runs on your device · Your file never leaves your device.
Choose a shape — 9:16 vertical for TikTok, Reels and Shorts, 1:1 square, 4:5 portrait post, 16:9 widescreen, 4:3, or a free rectangle — and a crop box appears on a still frame of your video. Drag it to the part of the picture you want to keep, pull a corner to resize it, and press Crop. It works with a finger on a phone as well as a mouse.
A crop removes pixels rather than squeezing them, so what stays keeps its sharpness and its proportions. The box always snaps to even pixel sizes, which H.264 requires, and the exact left, top, width and height are shown as numbers you can also type.
The result is an H.264 MP4 with the audio copied untouched whenever MP4 can carry it. Everything runs on your device; files over 1 GB are handled in parts that fit in memory. If you want the whole picture smaller instead of a piece of it, that is the Resize tool.
Not for: Following a moving subject — the crop box stays in one place for the whole clip.
The box starts as the largest rectangle of the chosen shape that fits the frame, centred. On a 1920×1080 landscape video that is 606×1080 for 9:16, 864×1080 for 4:5, 1080×1080 for 1:1 and 1440×1080 for 4:3. A 9:16 cut keeps less than a third of the width. On a 1080×1920 portrait video, 16:9 gives 1080×606 and 4:5 gives 1080×1350.
Nothing is scaled afterwards, so these are the dimensions of the finished file. If you need a larger frame, the Resize tool (/resize-video) can enlarge the result with upscaling switched on, though that adds no detail. Sizes are measured on the picture as it is displayed: a phone clip stored on its side with a rotation note is turned upright first, and the output carries no rotation note.
Left and Top count pixels from the top-left corner of the frame. With a shape selected, typing a width sets the matching height, and the other way round. Every value is snapped: width and height are rounded down to even numbers, and a box that would stick out of the frame is pushed back inside. Because of that rounding, a 9:16 box can be a pixel or two away from the exact ratio, as with 606×1080 above.
Choosing another shape puts a fresh centred box on the frame, so pick the shape first and fine-tune afterwards. The still frame is taken up to one second into the clip, because the very first frame is often black.
Without a preview you can press Crop straight away: the shape you chose is centred on the frame. VOB, AVI, WMV, FLV and RealMedia files are always cropped by the slower built-in engine, because the device-encoder path cannot read those containers. If even the engine cannot read the frame size, the tool stops before encoding and asks you to convert the file to MP4 on this site first, then crop that result.
On the device encoder the bitrate is worked out from the cropped frame, not the original one, and never exceeds the original's. When an input over 1 GB goes to the engine, it is cut by time into parts whose expected output stays under about 350 MB each, with the estimate scaled to the share of the frame you keep. If the parts together fit in 350 MB they are joined into one file. Otherwise each is offered as its own complete MP4, named like clip-cropped-part01of03.mp4, and the Join mode of this same tool (it opens directly at /vob-to-mp4) puts them together on a computer with more memory.
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