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Crop or fit a video to 9:16, 1:1, 4:5 or 16:9
Choose a file to start.
Imagera's free Video Cropper lets you crop video in your browser on a phone, tablet or computer. Creators and social media managers use it to change video aspect ratio for a feed: turn a horizontal video to vertical 9:16 for Reels, TikTok and Shorts, or make a square or 4:5 post. Fill the screen with a crop, or fit the whole picture on a blurred copy of itself or on color bars. Add your MP4, MOV, WebM or MKV file; it stays on your device. 2 free downloads, 8 more after sign-in.
Published · Updated · by the Imagera teamImagera is a browser-based AI studio for images, video, music and voice, so you do not need a separate app and account for every model. Pricing is credit-based: one balance covers every tool, and each job shows its credit price or estimate before you run it.
A 9:16 crop of a 1920 × 1080 clip keeps a 608 × 1080 window: 656,640 of its 2,073,600 pixels, about a third of the frame.
Try Viral Reel CutterFitting that same 1920 × 1080 clip whole into 9:16 on a computer makes a 1080 × 1920 frame. The picture fills a 1080 × 608 band across the middle, and blur or bars fill the rest.
From a 3840 × 2160 (4K) clip, the 9:16 window is 1216 × 2160. It is saved at 1080 × 1920 on a computer and at 720 × 1280 on a phone, because each device has a long-side cap.
Try 4K Video EnhancerEvery width and height the cropper writes is an even number of pixels, since H.264 encoders refuse odd frame sizes.
Fit decides what happens to the parts that do not fit. Crop to fill cuts the largest window of the new shape out of the picture, so the video fills the screen and loses its edges. The two whole-video options keep everything: the picture shrinks to fit inside the new frame, and the empty space gets a heavily blurred, slightly darkened copy of the same frame, or bars in the color you set under Bar color.
Cropping suits a clip whose subject stays in one place. The whole-video options suit slides, screen recordings, wide scenery and anything with lettering near the edges, at the cost of a smaller picture on the screen.
Crop position moves the window along the one direction it can travel. Cutting a tall shape out of a landscape clip slides it sideways: 0% keeps the left edge, 100% the right edge, and the starting value of 50% keeps the center. Cutting a wide shape out of a tall clip slides it up and down instead, while the other direction stays centered.
The window stays in one place for the whole clip. It does not follow a person who walks across the picture, so pick the spot where the subject spends most of the time, then play the result before posting.
From a 16:9 recording, a vertical crop keeps the full height and a strip about a third as wide. Look at what lies outside that strip before you choose it: a second speaker, a caption or a scoreboard. When two people must stay in shot, the blurred-background option keeps both, with the picture in a band across the middle of the screen.
A tall phone clip headed for YouTube is the same job turned around. Choose 16:9, then either crop a band out of the tall picture and slide it up or down, or show the clip whole with blurred sides.
The cropper never enlarges the picture. A crop keeps its own pixels and is scaled down only when its long side passes this device’s cap: 1920 pixels on a computer, 1280 on a phone. A blurred or barred frame takes the source’s long side, under the same cap.
Every frame is redrawn, so the clip is encoded again. Its bitrate is set from the source: a crop that keeps a third of the pixels gets about a third of the source bitrate, plus a 15% margin for the extra generation. A frame bigger than the clip, such as a square around a landscape video, keeps the source bitrate, because blur and bars cost the encoder very little.
Sound goes into the new file untouched where the container allows it. AAC and MP3 sound is copied into the MP4 as it is; other sound, such as Opus from a WebM screen recording, becomes AAC where this browser can encode it, and surround sound that must be re-encoded becomes stereo. Under the result, Sound reads Kept, None, or that this browser could not keep it.
The picture is saved as H.264 in an MP4 wherever the browser has that encoder, otherwise as VP9 or VP8 in a WebM. The download keeps your clip’s name with the shape added, such as beach-9x16.mp4. A phone clip stored sideways with a rotation flag is drawn upright first, so the new file needs no flag.
Every frame is decoded, redrawn and encoded again inside the browser tab, and the whole new file is held in memory. So a phone reframes up to 5 minutes per run at up to 1280 pixels on the long side, while a computer takes up to 60 minutes at up to 1920. Files are also checked against a size budget of 1 GB on a phone and 4 GB on a computer. For a longer clip, cut the part you need with the free Video Trimmer first.
Safari gets the same framing as Chrome. The tool draws the whole frame shifted so the window lands on the canvas, because Safari ignores the source area it is given for a video frame. Where a browser has no canvas blur, the background is softened by shrinking and re-enlarging a small copy, which looks about the same. MP4s encoded in Safari also get their color tag corrected, so blacks do not turn grey in other players.
This cropper reshapes one clip with one fixed window. If you have a long recording and want several vertical clips from it, the paid AI reel cutter finds the moments worth posting and cuts each one into a vertical reel.
If a crop leaves the picture soft, for example a 608-pixel-wide window shown full screen on a phone, the paid AI video enhancer sharpens and upscales it in the cloud. Crop here first, then enhance the cropped file.
Choose your MP4, MOV, WebM or MKV video. A phone clip saved with a rotation flag is drawn upright before cropping.
Choose a shape under Shape, then crop to fill or keep the whole picture on blur or bars.
With Crop to fill, slide Crop position until the subject sits in the frame, then start the crop.
Watch the cropped clip with sound, and read Frame, Fit and Sound under it before saving.
2 free downloads, 8 more after sign-in.
| This free tool | Paid AI tools |
|---|---|
| One fixed crop window, or the whole picture fitted, for the entire clip | The AI reel cutter picks moments from a long video and cuts them into vertical reels |
| Keeps the picture at or below its own resolution | The AI video enhancer sharpens and upscales soft footage in the cloud |
| Reads and re-encodes the clip on your device | Paid tools run on Imagera servers |
| 2 free downloads, 8 more after sign-in. | Paid tools use their own displayed prices and access conditions. |
Add the clip and keep 9:16, the shape Shape starts on. Leave Fit on Crop to fill, slide Crop position until the subject is inside the window, then run the crop and play the result.
Choose 9:16 and one of the whole-video fits. The full landscape picture is kept, shrunk to the width of the vertical frame, with a blurred copy of itself or plain bars above and below.
Yes. The blurred option paints a soft, slightly darkened copy of each frame behind the picture, so the background moves with the clip. The bars option fills the space with one color; pick it under Bar color.
Pick the square or the 4:5 shape under Shape. From a 1920 × 1080 clip, the square crop is a 1080 × 1080 window and the 4:5 crop is 864 × 1080, both at full height.
Yes, along one direction. Crop position runs from 0% (left or top edge) to 100% (right or bottom edge); the other direction is always centered.
No. The window is fixed for the whole clip, with no tracking. If the subject moves a lot, a whole-video fit keeps them in view, or cut the clip into parts and crop each one.
The kept pixels are never enlarged, but every frame is encoded again, which adds a small generation loss. The bitrate follows the share of pixels kept, so the kept area gets about what the source spent on it.
A 1080p clip gives 608 × 1080 on any device. A 4K clip gives a 1216 × 2160 window, saved at 1080 × 1920 on a computer or 720 × 1280 on a phone.
No. The tool never squashes or stretches the picture, because people and text would look distorted. It either crops a window of the new shape or fits the whole picture inside it.
Often, yes. When the bars are even on both sides and the picture between them has one of the offered shapes, crop to that shape with Crop position at 50%. Uneven bars, or a picture of another shape, will leave a sliver or cut into the picture.
Yes. Choose 16:9, then either crop a wide band out of the tall picture or keep it whole with blurred sides. A 1080 × 1920 phone clip cropped to 16:9 becomes a 1080 × 608 band.
Yes. Open this page in Safari, Chrome or another current browser, pick the clip from your library and crop it here. On a phone, each run takes up to 5 minutes of video.
Cropping cuts away the edges outside a window and keeps the rest at its own size. Resizing scales the whole picture to new dimensions. This tool crops or fits to a shape, only scales down when a frame passes the device cap, and has no field for exact pixel sizes.
No. The clip is read, redrawn and saved inside your browser. The page still loads its own code over the network, but the video itself is not sent anywhere.
It can. The cropped clip is saved as an MP4 (H.264) when your browser can encode that, otherwise as a WebM. A MOV or MKV source therefore comes back as an MP4 in most browsers.
Up to 60 minutes and 4 GB per run on a computer, and up to 5 minutes and 1 GB on a phone. A longer clip gets a message telling you the limit; trim the part you need first.
A clip within 1% of the chosen shape is left alone, because encoding it again would only cost quality. Pick another shape, or post the clip as it is.
Yes, in most browsers. The sound track is copied, or converted to AAC for an MP4 when it is in another format. If a browser cannot keep it, the Sound line under the result says so.
Your first 2 downloads are free with no account. Sign in free for 8 more. Any paid Imagera plan makes downloads unlimited, and adds AI credits for the paid tools. Processing and the preview are always free.
Your first 2 downloads and every download on a paid plan have none. Free downloads 3 to 10, after sign-in, carry a small “Made with imagera.ai” badge in the corner. The result on screen is always clean.
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