100% private — processing happens on your device, nothing is uploaded.
Works best with short clips (Reels, TikTok, Stories). Very large files may be slow on mobile.
By using this tool, you agree to our Terms of Use
Switch to 9:16 or 1:1 and drag the frame until the subject is centered.
See exactly what will export before you process—still 100% on-device.
No cloud upload. FFmpeg.wasm crops locally in your browser.
Social apps want vertical or square frames. Uploading a 16:9 clip often letterboxes or zooms badly.
Unvidio shows a preview with a movable crop frame, then exports MP4.
Use after trim when you only need part of the timeline.
Crop only files you own or may process. Everything runs on your device.
Select a local file. The preview appears under the drop zone.
Choose 9:16, 1:1, or 16:9, then drag the frame to reframe.
Click Crop, wait, then download the reframed MP4.
For talking-head Reels, keep eyes in the upper third. For products, center the item. Avoid cutting text at the edges—safe zones matter on TikTok.
Private browser cropping—Unvidio does not store your videos.
Cropping changes aspect ratio without changing the story length.
This tool crops (cuts edges). It does not stretch the image. That keeps faces looking natural.
FAQ
Quick answers to the most common questions about this tool.
Yes. Select 9:16, drag the preview frame, then crop.
No. The video preview and crop math stay in your browser.
It re-encodes to MP4. Use a reasonably high source resolution for best results.
Presets cover the social ratios. Original keeps the full frame (no crop).
Yes for short clips. Drag may be easier on desktop for precise framing.
Choose Original, or still crop 9:16 to reframe a tighter shot.
Output is already MP4. Convert only if you need WebM or MP3.
Only process videos you own or have rights to edit.