Crop Video Tool

Trim unwanted edges from a video. Useful for removing black bars or tightening framing.

Local processing only — your file never leaves the browser

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Drag & drop a video, or tap to select

MP4 / MOV / WebM, up to 500 MB

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Trim from top (%)

Trim from bottom (%)

Trim from left (%)

Trim from right (%)

Numbers are percent of the source video's width / height. Top 10% + bottom 10% leaves 80% of the height in the output.

Processing… 0%

Download cropped video

Useful next tools

Popular uses

Remove black barsAdjust aspect ratioCrop for social formats

Next tools

Aspect Ratio Calculator SNS Video Resizer Thumbnail Extractor

What this tool does

Per-side crop in % (top / bottom / left / right)
Presets for letterbox removal, square 1:1, vertical 9:16
Video re-encode; audio stream-copy (lossless)
Auto-rounds to even dimensions for libx264 compatibility
Local-only processing — your file never leaves the browser

How to use

1
Drop the video
MP4 / MOV / WebM, up to 500 MB.
2
Pick a preset or enter values
4 presets, or enter top/bottom/left/right percentages directly.
3
Run
Preview will appear; download the result.

What each setting means

Top / Bottom / Left / Right (%)

Percent of the source dimensions to remove from each side.

Preset: Remove black bars

Trims 12.5% from top and bottom — for cinemascope footage in 16:9 containers.

Preset: Square (1:1)

Trims 21.875% from each side of a 16:9 source for Instagram square posts.

Preset: Vertical (9:16)

Trims 28.125% from each side of a 16:9 source for TikTok / Shorts.

Recommended settings

Cinemascope clip in a 16:9 container

Top 12.5% + bottom 12.5%

Removes the 2.35:1 letterbox bars cleanly.

Landscape → Instagram square

Square preset (1:1)

Trims sides evenly to keep the center in frame.

Subject closer to center

Custom 15% on each side

Removes distracting edges and emphasizes the subject.

Common pitfalls

Symptom: Output has green or black borders

Cause: Crop went outside the frame, or odd dimensions.

Fix: The tool auto-rounds to even pixels; combined crop > 95% rejects.

Symptom: Cropped more than expected

Cause: Specified percentages on both sides.

Fix: Top 10% + bottom 10% removes 20% of the height. Set the side you don't want to crop to 0.

Symptom: Subject got cropped out

Cause: Preset assumes center framing.

Fix: Use custom mode and set asymmetric percentages to keep your subject in frame.

Equivalent FFmpeg commands

Reference commands you can run on the desktop FFmpeg CLI.

Trim 10% from top and bottom

ffmpeg -i input.mp4 -vf "crop=iw:ih*0.8:0:ih*0.1,scale=trunc(iw/2)*2:trunc(ih/2)*2" -c:v libx264 -crf 20 -c:a copy output.mp4

Square (16:9 → 1:1)

ffmpeg -i input.mp4 -vf "crop=ih:ih:(iw-ih)/2:0" -c:v libx264 -crf 20 -c:a copy output.mp4

Vertical (16:9 → 9:16)

ffmpeg -i input.mp4 -vf "crop=ih*9/16:ih:(iw-ih*9/16)/2:0,scale=trunc(iw/2)*2:trunc(ih/2)*2" -c:v libx264 -crf 20 -c:a copy output.mp4

Browser support & limits

Recommended max: 500 MB
Combined crop must stay below 95%
Drag-to-select region planned for a future update

Privacy

This tool runs ffmpeg.wasm directly in your browser. Files never leave your device — everything runs locally. Read the privacy policy →

Frequently asked questions

Can I crop off-center?

Yes — set one side to 0% and only crop the opposite side. "Left 20%, right 0%" produces a frame shifted to the right.

Do I need to know the source resolution first?

No. The tool uses FFmpeg expressions like iw*0.X internally, so the crop adapts to whatever dimensions the input has.

Does cropping affect audio?

No — audio is stream-copied unchanged.

Why 12.5% for letterbox removal?

2.35:1 cinemascope inside a 16:9 container leaves roughly 12.5% black on top and bottom. If your specific clip differs, adjust manually.

How does file size change?

Lower pixel count → 30–70% smaller at the same CRF.