Free online tool to resize videos and change resolution. Support HD, 4K and custom sizes. Multiple scaling algorithms. Local processing protects your privacy
Click or drag video file here
Supports MP4, MOV, AVI, WebM, MKV, FLV and other formats
Processing happens on your device. Your files never leave your computer
Video Resizer is a powerful online tool for changing video resolution and dimensions. It supports multiple video formats including MP4, MOV, AVI, WebM, MKV and more. All processing happens locally in your browser without uploading files to any server, completely protecting your privacy.
The tool offers 9 preset sizes covering common use cases: 4K UHD (3840×2160), Full HD (1920×1080), HD (1280×720), and social media optimized sizes for Instagram, Twitter, YouTube. You can also set custom dimensions with pixel-level precision. The aspect ratio lock feature prevents video distortion during resize.
Choose from 4 professional scaling algorithms to balance quality and speed: Lanczos for highest quality, Bicubic for good quality, Bilinear for balanced performance, and Fast mode for quick processing. We use advanced FFmpeg.wasm technology to provide professional-grade video processing in your browser. Completely free, no registration required, ready to use instantly.
Resize videos to perfect dimensions for Instagram posts, stories, Twitter, YouTube thumbnails
Reduce video resolution to decrease file size for easier sharing and faster upload
Convert high-resolution videos to lower resolution for older devices or limited storage
Upscale low-resolution videos to higher resolution with advanced algorithms