Video Resolution Converter
Change video resolution to 480p, 720p, 1080p, or 4K. Upscale or downscale video quality. Free online video resizer.
Free video resolution converter. Change to 480p, 720p, 1080p, 2K, or 4K. Custom resolution support. 100% browser-based processing.
- ✓ Preset resolutions: 480p, 720p, 1080p, 2K, 4K
- ✓ Custom width/height with aspect ratio lock
- ✓ Upscale or downscale video resolution
- ✓ Maintains aspect ratio automatically
- ✓ 100% client-side - videos never uploaded
How to Convert Video Resolution
- 1 Upload a video file by clicking or dragging and dropping
- 2 Select the target resolution preset (480p, 720p, 1080p, 4K) or custom
- 3 Optionally adjust width and height for custom resolution
- 4 Click Convert Resolution to begin processing
- 5 Download the converted video when processing completes
Frequently Asked Questions
How does browser-based video processing work? ▼
MagicKit uses FFmpeg compiled to WebAssembly (WASM). This brings professional video editing capabilities directly to your browser.
What video formats are supported? ▼
MP4, WebM, MOV, and AVI. Some tools also support MKV and other formats.
Is there a file size limit for videos? ▼
We recommend files under 500MB for optimal browser performance. Larger files will work but may be slower.
Why does video processing take time? ▼
Video encoding is computationally intensive. Processing happens on your device, so speed depends on your computer's capabilities.
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Last updated: January 15, 2026 · v2.1