- Upload: Drag and drop or click to upload a video.
- Choose Size: Pick a preset (4K, 1080p, 720p, 480p, 360p, Instagram, TikTok, Twitter) or enter custom dimensions.
- Resize: Click Resize — the video is re-encoded at the new resolution using H.264.
- Download: Save the resized video.
Video Resizer — Change Video Resolution in Your Browser
Our Video Resizer uses FFmpeg.wasm to resize videos to any resolution — with 8 built-in presets for popular platforms and custom dimension support. All processing happens 100% in your browser.
Resolution Presets
- 4K (3840×2160): Ultra HD for high-end displays
- 1080p (1920×1080): Full HD — standard for YouTube and most platforms
- 720p (1280×720): HD — good balance of quality and file size
- 480p (854×480): Standard definition for smaller screens
- 360p (640×360): Low resolution for minimal file sizes
- Instagram (1080×1080): Square format for Instagram feed
- TikTok (1080×1920): Vertical 9:16 format
- Twitter (1280×720): Landscape format optimized for Twitter
How It Works
The tool uses FFmpeg's scale filter to resize the video, then re-encodes with H.264 (CRF 23) for high quality output. Audio is preserved with AAC encoding at 128kbps. The output includes the faststart flag for optimized web playback.
Common Use Cases
- Social media optimization: Resize for Instagram, TikTok, Twitter, YouTube
- File size reduction: Downscale large 4K videos to 1080p or 720p
- Upscaling: Scale up lower resolution videos (quality depends on source)
- Aspect ratio changes: Convert landscape to square or portrait
Privacy
All processing happens locally in your browser using WebAssembly. No video data is transmitted to any server.