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A landscape clip rarely fits a vertical feed, and a wide shot often hides the subject in a corner. Draw a crop box over the video, lock it to a social aspect ratio if you like, scrub through to check nothing important leaves the frame, and export a new MP4.
Processing locally on your device
Overview
Cropping cuts away the edges of every frame and keeps only the rectangle you choose. In this tool the crop box sits directly on top of the playing video, with everything outside it darkened and rule-of-thirds guides inside it. Drag the box to move it, pull a corner to resize it, or type exact X, Y, width and height values in pixels. Arrow keys nudge the box by 2 pixels, or 10 with Shift held.
Seven aspect presets are built in: Free, 1:1, 4:5, 9:16, 16:9, 4:3 and 21:9. Picking a ratio fits the largest possible box of that shape to the frame and keeps the proportions locked while you resize. A 9:16 crop of a 1920 × 1080 recording, for example, becomes a 606 × 1080 vertical strip you can slide left and right to follow the action. The crop is the same for the whole clip, so scrub through before exporting to make sure the subject stays inside.
The output size can stay at the cropped pixel size, or be scaled so the shorter side is 1080 or 720 pixels. That means a 9:16 crop exported at 1080p comes out at 1080 × 1920, the size Reels, Shorts and TikTok expect. If the crop is smaller than the target, the tool warns you that it will be upscaled and look softer. Width and height are rounded down to even numbers, which H.264 requires.
Export runs FFmpeg 5.1 compiled to WebAssembly, so the video is processed inside your browser tab and never uploaded. Because the picture changes, every frame is re-encoded to H.264 (CRF 20). The engine is single-threaded in the browser, so a minute of 1080p footage can take a few minutes on a typical laptop. The engine itself is a one-time download of about 31 MB that your browser caches. AAC and MP3 audio is copied unchanged; other audio is converted to AAC.
| Preset | Crop at Keep | Export at 1080p | Common use |
|---|---|---|---|
| 9:16 | 606 × 1080 | 1080 × 1920 | Reels, Shorts, TikTok, Stories |
| 4:5 | 864 × 1080 | 1080 × 1350 | Instagram and Facebook feed |
| 1:1 | 1080 × 1080 | 1080 × 1080 | Square feed posts |
| 4:3 | 1440 × 1080 | 1440 × 1080 | Presentations, older displays |
| 21:9 | 1920 × 822 | 2522 × 1080 | Cinematic widescreen look |
Drop a video (MP4, MOV, WebM or MKV) into the cropper.
Choose an aspect ratio, or leave it on Free.
Drag and resize the crop box on the video, or type exact pixel values.
Scrub through the clip to check the subject stays inside the box.
Pick Keep, 1080p or 720p output and click Crop video.
Preview the result and download the MP4.
Use cases
Turn a 16:9 recording into a 9:16 clip for Reels, Shorts or TikTok. Lock the ratio, slide the box over the speaker and export at 1080p to get a 1080 × 1920 file.
Make a 1:1 or 4:5 version of a clip for an Instagram or LinkedIn feed, where taller formats take up more of the screen than widescreen video.
Cut away letterbox bars, a webcam border, a taskbar or a bit of tripod at the edge of the frame with a Free crop and exact pixel values.
Crop a full-desktop capture down to the single window or region that matters, so viewers can read the text without zooming.
Pro tips
Answers to common questions about the video cropper.
No. The crop rectangle is fixed for the whole video. If your subject moves, choose a box big enough to contain the movement, or split the clip and crop each part separately.
With Keep, it is the pixel size of the box, for example 606 × 1080 from a 1080p source. With 1080p selected, the shorter side is scaled to 1080, giving 1080 × 1920.
H.264 video with 4:2:0 colour needs even widths and heights, so the tool rounds the crop down to even numbers. The difference is at most one pixel per side.
The kept pixels are re-encoded at CRF 20, which is visually transparent for most footage. Scaling a small crop up to 1080p will look softer, because no new detail can be created.
Every frame is re-encoded on your CPU by a single-threaded WebAssembly build of FFmpeg. Expect a few minutes per minute of 1080p video on a laptop; short or small clips are much faster. Clips over four minutes use a faster x264 preset.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The video cropper is free to use with no sign-up, no watermarks and no daily limits.