> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bibigpt.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Free Online Video Cropper

> Crop videos to any aspect ratio directly in your browser. Choose 16:9, 9:16, 1:1, 4:3 or set custom dimensions — no upload to servers, no watermark. Supports MP4, MOV, WebM, AVI, MKV.

## Overview

The free online video cropper lets you crop videos to any aspect ratio right in your browser. Presets for 16:9 (landscape), 9:16 (vertical short-form), 1:1 (square), and 4:3 are built in, plus a free-drag custom crop area. Supports MP4, MOV, WebM, AVI, and MKV files. Everything runs locally — your footage never leaves your device.

## Pain Point

Landscape footage that needs to be vertical for TikTok, black bars that need trimming, or a watermark at the edge — opening a heavy editor just to crop a frame is overkill. This tool handles it in seconds: pick a ratio, adjust the crop area, download.

## Key Features

* Preset aspect ratios: 16:9, 9:16, 1:1, 4:3 — one click to select
* Custom crop area: drag the selection box to freely adjust the crop region
* Supports MP4, MOV, WebM, AVI, MKV, and more
* Real-time preview of the cropped result
* 100% browser-based, no server upload, no watermark
* Free, unlimited use, no sign-up required

## Highlights

Pick a ratio, drag to adjust, download — done in under 30 seconds. Built-in presets cover the most common social platform aspect ratios, saving trial-and-error time. Browser-based processing is faster than waiting for traditional editors to render.

## Use Cases

* **Landscape to vertical**: Crop 16:9 footage to 9:16 for TikTok, Reels, Shorts, and Xiaohongshu
* **Remove black bars**: Trim black borders around the video for a tighter frame
* **Square video**: Crop to 1:1 for Instagram posts and WeChat Moments
* **Watermark removal**: Crop out edge watermarks from the frame
* **Screen recording cleanup**: Trim unnecessary desktop area from screen recordings, keeping only the key content

## Tips

* Select your target platform's recommended ratio before cropping
* When using custom crop, make sure the key subject stays inside the crop area
* Need to trim duration as well? Pair with BibiGPT's [video trimmer](https://bibigpt.co/features/free-online-video-trimmer)

***

**Related**: [Free Video Trimmer](https://bibigpt.co/features/free-online-video-trimmer) — Try it now

**Upgrade to Pro**: Unlock unlimited access → [View Pricing](https://bibigpt.co/pricing)

## Related Features

<CardGroup>
  <Card title="Free Video Trimmer" href="/en/function-usage/platform-function/free-online-video-trimmer" />

  <Card title="Free Video Rotator" href="/en/function-usage/platform-function/free-online-video-rotator" />

  <Card title="Free Video Speed Changer" href="/en/function-usage/platform-function/free-online-video-speed-changer" />
</CardGroup>