Resize/Crop Video

Add the video, choose a size under Size (from 240p up to 4K, measured on the shorter side) and press Make the new video. The new MP4 appears with a player and a Download button, and the sound is kept. A video is never made larger than it was, because enlarging adds no detail.

Pick the new shape under Change the shape (square 1:1, upright 9:16, wide 16:9, portrait post 4:5, 4:3 or 3:4), then choose what happens when the video is not that shape: cut the edges, keep it all with black bars, or keep it all on a blurred background. The picture is never stretched, so people do not come out wider or thinner.

For Reels and Stories choose Upright (9:16), for a feed post choose Portrait post (4:5) or Square (1:1), then pick 1080p under Size. If the video is wider than the shape, decide whether the edges may be cut or the whole picture must stay. Sources suggest 1080 × 1920 for Reels, but the apps change their rules, so check the size the app asks for before you post.

Choose the shape (9:16 for Reels and Stories, 4:5 or 1:1 for a post), then choose Keep it all, on a blurred background, or Keep it all, with black bars. A landscape video then sits in the middle of the frame and nothing is cut off. Choose 1080p under Size to get 1080 × 1920 for an upright video.

Choose Upright (9:16) and Cut the edges. A preview shows what will be kept; pick Left or top, Middle or Right or bottom under Keep which part to move the cut, and zoom in if the subject is small. Choose 1080p under Size if you want 1080 × 1920.

Choose Square (1:1) and Cut the edges. The middle of a landscape video is kept by default; move it to the left or right with Keep which part. To keep the whole picture instead, choose one of the Keep it all choices and the square is filled in around it.

Tick Cut away black bars at the sides or the top and bottom and make the video. The server looks at several moments spread through the video, finds the bars, and cuts the video down to the picture. If it finds no bars and you asked for nothing else, it tells you so instead of making a copy.

Cutting part of the frame means the video is made again, so it cannot be a plain copy. It is made again at a high quality setting (H.264, close to the original), so the difference is small and hard to see, but it is not nothing. In testing, a clip with bars added around a 960 × 540 picture came back as exactly 960 × 540.

Black bars appear when a video's shape does not match the screen or frame it is shown in: a wide video on a tall phone screen gets bars above and below, an old 4:3 video on a wide screen gets them at the sides. Sometimes the bars are part of the file itself, and then you can cut them away here. If they appear only when you play it, make the video the shape of the place you will post it.

Bars on YouTube mean the video's shape differs from the player's. Sources advise uploading the video in the right shape to begin with. If the bars are in the file, tick Cut away black bars here and upload the new video; if the video is upright, crop it to 16:9 or fit it on a blurred background before you upload.

Cropping cuts away the edges, so the video shows less and can be a different shape. Resizing changes how many pixels the video has, so it plays the same picture at a lower resolution and usually takes less space. You can do both at once here: choose a shape and a size and make the video once.

It is the width compared with the height: 16:9 is wide like a TV, 9:16 is the same shape standing up like a phone held upright, 1:1 is square, and 4:5 is a little taller than wide. Changing the aspect ratio changes the shape of the frame, not only its size.

Sources point to 9:16 for full-screen vertical video (Reels, Stories, TikTok, Shorts), 16:9 for YouTube and most players, and 4:5 or 1:1 for feed posts. The apps change what they accept, so check the shape and size the app asks for before you export.

Choose Upright (9:16). To keep everything, choose Keep it all, on a blurred background: the landscape picture sits in the middle and a blurred copy of it fills the top and bottom. To fill the whole frame instead, choose Cut the edges and decide which part of the picture to keep.

Choose Wide (16:9) and Keep it all, on a blurred background. The upright picture stays whole in the middle and a blurred copy of it fills the sides, which looks better than black bars. Cut the edges would keep only a thin strip of the middle.

No. The shape changes by cutting the edges, adding black bars or adding a blurred background, never by pulling the picture out of proportion.

Leave the shape alone and choose 720p under Size. The size is the shorter side, so 1080p means 1920 × 1080 for a wide video and 1080 × 1920 for an upright one. The page shows about how big the new video will be before you start.

A smaller size usually means a smaller file: in testing, a 74 MB 1080p test video became about 8 MB as a 720 × 1280 upright video. Cropping alone keeps every pixel that is left, so the file stays close to its old size. To aim for a smaller file directly, use Compress Video on the result.

Yes. The sound is kept; it is copied when MP4 can hold it and turned into AAC when it cannot. A video with no sound stays silent.

Yes. Under Keep which part choose the left or top, the middle, or the right or bottom, and the preview moves to show what will be kept. Zoom in to cut closer around the subject.

Yes, from 1× to 4×. Zoom cuts a smaller window out of the picture, so the video shows less and has fewer pixels (a 1280 × 720 video zoomed 2× comes out at 640 × 360) and stays as sharp as the original.

The picture is made again at a high quality setting, so a crop looks the same as the original to the eye. A lower size has fewer pixels and so less fine detail, which is the point of making it smaller; enlarging is never done.

Yes. Cutting or scaling a video means making it again, which is too slow for a browser, so this tool works on ToolStudio's server: the video is uploaded for it and the files are deleted automatically afterwards. The page says that the video was made on the server.

Videos up to 100 MB can be added. The server also refuses a video that would take too long to make, which in practice means about a minute and a half of 1080p video or three and a half minutes of 720p. Trim a longer one first with Trim Video, or choose a smaller size.

It depends on the video's length and size, plus your upload and download time. In our testing, a 30-second 720p clip took about 10 seconds to make, and a minute of 1080p took 20 to 30 seconds; a busy server can take longer.

MP4, MOV, MKV, WebM, AVI and WMV all work, up to 100 MB. The new video is always an MP4 with H.264 picture, which plays on nearly every phone, computer and website.

Open this page in Safari or Chrome, add the video from your photos or files, choose the shape and size, make the new video and download it to your phone.

Use Rotate/Flip Video for that, and then bring the result here. The JustAsk AI chat can do both in one request.

Yes. Attach the video to the chat and say what you want, for example make this 9:16 on a blurred background at 1080p, or cut away the black bars. The AI uses the same shapes, positions, zoom and sizes as this page, and shows the new video with a player and a Download button.

Each video is a separate job. Download the new video, press Start over and add the next.

It is free, with no watermark, no account and no limit on how many videos you make.