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Video Aspect Ratio Changer

Change video aspect ratio for social media with one click

🎬

動画ファイルをドロップ

またはクリックして選択

About Video Aspect Ratio Changer

The Video Aspect Ratio Changer optimizes video dimensions for social media platforms. It supports recommended aspect ratios for YouTube (16:9), TikTok (9:16), Instagram Portrait (4:5), Instagram Square (1:1), and other major platforms, ensuring videos display optimally on each platform.

Choose from three fit modes for flexible conversion. Crop mode automatically trims excess areas to match the target ratio. Letterbox mode adds padding (customizable background color) to preserve all original content. Stretch mode fills the entire frame by distorting the image. You can select your preferred background color using the built-in color picker when using letterbox mode.

Output resolutions range from 480p up to 4K, allowing you to balance file size and video quality. The tool uses FFmpeg WebAssembly to process videos entirely in your browser, ensuring your files are never sent over the internet and your privacy remains fully protected.

How to use Video Aspect Ratio Changer

  1. Drag and drop a video file or click to select one
  2. Choose the target aspect ratio (preset dimensions available for YouTube, TikTok, Instagram, etc.)
  3. Select output resolution from 480p to 4K
  4. Select a fit mode (crop, letterbox, or stretch)
  5. For letterbox mode, customize the background color using the color picker
  6. Click the 'Change Aspect Ratio' button to start conversion
  7. After processing completes, download the converted video

Benefits of Video Aspect Ratio Changer

  • Processes videos entirely in your browser—files never leave your device, privacy fully protected
  • Preset dimensions for YouTube, TikTok, Instagram, Facebook, and other major platforms
  • Three fit modes (crop, letterbox, stretch) offer flexible conversion options
  • Five resolution options from 480p to 4K for balancing file size and quality
  • Customize background colors for letterbox mode using an intuitive color picker
  • Free, no installation required, no sign-up needed—start using immediately

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