Video Tools
Video Resizer
Resize, crop, and change the aspect ratio of videos for any platform.
Your files stay on your device - processed locally via WebAssembly, never uploaded
Drop a video file or click to upload
MP4, WebM, MOV
Your videos are processed locally. Nothing is uploaded.
Embed this tool on your website
Copy this code to add the Video Resizer to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/video-resizer" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Video Resizer by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/video-resizer">OptiPix Video Resizer</a></p>
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About Video Resizer
Last updated: May 2026
OptiPix Video Resizer は、ブラウザ上で直接ビデオの寸法、解像度、アスペクト比を変更します。標準解像度（1080p、720p、480p）またはカスタムサイズから選択してください。Instagram Reels、TikTok、YouTubeなどのソーシャルメディアプリセットも利用可能です。アスペクト比オプション：元のアスペクト比を維持、16:9、4:3、1:1、または縦長の9:16に強制。FFmpeg.wasmのscaleフィルターを使用します。
How It Works
FFmpeg.wasmの-vf scaleフィルターでビデオをリサイズします。アスペクト比の変更には、必要に応じてpadまたはcropフィルターを使用します。
Use Cases
- •Instagram Reels用にリサイズ
- •横長を縦長に変換
- •4Kを1080pにダウンサイス
- •メール添付用にリサイズ
- •プレゼンテーション用にクロップ
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