Crop Video to a New Aspect Ratio in Your Browser
Center-crop any video to 9:16 vertical, 1:1 square, 4:3 or 16:9 — processed locally in your browser with nothing uploaded.
Crop a video to a different aspect ratio directly in your browser: 9:16 for TikTok, Reels and Shorts, 1:1 square, 4:3 classic or 16:9 widescreen. The frame is center-cropped and re-encoded with the audio copied untouched. Your file never leaves your device.
Choose a file or drop it here
🔒 Processed locally — never uploaded.
A widescreen recording posted to Reels shows up as a tiny letterboxed strip — vertical platforms want vertical pixels. This tool center-crops your video to the aspect ratio you pick: 9:16 for TikTok, Reels and Shorts, 1:1 for feeds, 4:3 or 16:9 for classic and widescreen targets. The picture is cropped around the center (where the action usually is) and re-encoded; the audio is copied through untouched. Choose the ratio, drop the file, download.
How it works
- Choose the target aspect ratio first: 9:16 vertical (default), 1:1 square, 4:3, or 16:9 widescreen.
- Pick a video from your device or drop it into the box — the frame is center-cropped to the chosen ratio and re-encoded, with audio copied losslessly.
- Press the download button for your cropped MP4.
Common uses
- Turn a widescreen recording into a 9:16 vertical clip for TikTok, Reels or Shorts.
- Make a square 1:1 version of a clip for feed posts.
- Reframe a screen recording to 4:3 for slide decks or documentation.
- Cut letterboxed borders off a video by cropping to its true content ratio.
Supported formats and limits
| Input | MP4, MOV, WebM, MKV, AVI (H.264, H.265/HEVC, VP8, VP9, MPEG-4) |
|---|---|
| Output | MP4 — H.264 video center-cropped to the chosen ratio + original audio copied losslessly |
| Ratios | 9:16 (vertical, default) - 1:1 (square) - 4:3 - 16:9 |
| Maximum file size | 500 MB (in-browser memory limit) |
| Where it runs | Entirely in your browser (WebAssembly) — keeps working offline once loaded |
Frequently asked questions
Is my video uploaded while cropping?
No. The crop runs inside your browser using FFmpeg compiled to WebAssembly. Your file never leaves your device.
Which part of the frame is kept?
The center. Most footage keeps its subject near the middle, so a center crop works for the vast majority of clips. A draggable crop region is on our roadmap.
Does cropping lose quality?
The kept region is re-encoded once with a bitrate matched to your source, so quality stays visually close to the original. The audio is copied bit-for-bit.
Why does my 9:16 crop look zoomed in?
Because cropping removes the sides rather than squeezing them: a 16:9 frame cropped to 9:16 keeps only the middle third of the width. That is what makes it fill a vertical screen edge to edge.
Is there a size limit?
Files up to 500 MB are supported. Processing takes roughly 1.5x the video length, since the picture is re-encoded.
Is this free?
Yes — free, no signup, no watermark, no queue. Processing happens on your device, so there is nothing for us to meter.