Use the free Video Cropper Online below: cut the edges off any MP4 or WebM video and reframe it, with a live crop preview before you process. Your file never leaves your device.
What the Video Cropper does
The Video Cropper Online cuts off the edges of a video. You draw a rectangle inside the frame, and the tool keeps only what is inside that rectangle. Everything outside it is removed. It is the video version of cropping a photo: a shaky edge disappears, a stranger at the side of the shot goes away, or a wide clip becomes a square clip for a social post.
Everything happens in your browser. Your video is never uploaded, and you never need an account. The tool works with MP4, WebM, and MOV files, as long as your browser can play them. Before you process anything, the tool shows a live crop preview, so you can see exactly which part of the picture will survive.
How to use the Video Cropper
First, check the format line at the top of the tool. It tells you the exact output format your browser will produce, before you start. In Chrome and Edge that is usually MP4. In Firefox it is WebM. Next, choose a video file. The tool shows the original frame size, length, and file size.
Then set the crop rectangle. Type the left and top start points in pixels, plus the width and height you want to keep. Or use a preset: Center 80 percent keeps the middle four-fifths of the picture, Center square cuts a square from the middle, Center 16:9 cuts a widescreen rectangle from the middle, and Full frame keeps everything. The live preview updates as you change the numbers, and the before-and-after line shows the old frame size next to the new one. When the preview looks right, press Crop video. Processing takes about the length of the video. Then watch the cropped video and download it.
Worked example: from 640 by 360 to 512 by 288
Here is a real test we ran with this tool. We started with a video that was 640 by 360 pixels, 2.0 seconds long, and 36.1 KB in size. We used the Center 80 percent preset, which kept the middle rectangle of the picture.
The tool produced a cropped video of 512 by 288 pixels, 2.1 seconds long, and 162,987 bytes in size, saved as MP4. The sound track was kept, and the picture now shows only the middle of the original frame. The file grew larger than the original because the cropped video was re-encoded at a fixed recording quality, which is a normal trade-off of this browser method. The lesson is simple: cropping changes the frame size, not the length, and the output is always a new file.
What cropping can and cannot fix
Cropping removes edges, and that is all it does. It can hide a finger over the lens edge, cut out black bars, or reframe a shot for a square or vertical post. It cannot sharpen a blurry video, remove an object from the middle of the frame, or add quality that was never there. If the middle of your picture is blurry, the cropped video will be blurry too, just larger in the frame.
Cropping also cannot stretch the picture. The rectangle keeps the original pixels at their original proportions. A square crop from a wide video gives you a square video, not a squeezed wide video. That honesty matters, because a stretched video looks wrong in a way that is hard to undo.
Honest limitations
The output is re-encoded, never lossless, so picture quality can drop slightly. The crop rectangle must stay fully inside the original frame: if your numbers run past the edge, the tool blocks the job and tells you to fix them. Very long videos take a long time, because the tool records in real time, and the browser tab must stay open while it works. Finally, the cropped video keeps the original length and sound, so cropping will not shorten your video or silence it.
Good uses for the Video Cropper
This tool fits everyday reframing jobs. Cut black bars off an old clip. Turn a wide phone video into a square clip for a feed post. Remove a distracting edge from a screen recording before you share it. Trim the edges of a tutorial recording so the viewer looks at the work, not the messy desk around it. For quick reframing without installed software, it is a practical free option.
Frequently asked questions
Does cropping change the video length? No. Cropping only changes the frame size. A 2-second video stays a 2-second video, with the same sound.
Can I crop to an exact size? Yes, as long as the rectangle fits inside the original frame. Type the exact left, top, width, and height in pixels, and check the live preview before you process.
Will the cropped video lose quality? A little, yes. The output is re-encoded. The drop is small for most clips, but cropping cannot add sharpness back.
Do my videos leave my device? No. The whole job runs in your browser. Nothing is uploaded, and no account is needed.
Spanish version: Cortar Bordes de Video Online