Video Resolution 转换er

Video resolution requirements vary across platforms and 使用场景—YouTube recommends different resolutions, mobile 设备s need smaller files, and archival systems may need specific dimensions. Resizing videos to different resolutions is essential for adapting content across diverse viewing contexts.

Common resolutions

Choose from standard resolution presets like 1080p (Full HD), 720p (HD), 480p (mobile-friendly), or define custom dimensions. Each resolution has distinct purposes: 1080p for quality archival and streaming, 720p for fast streaming and web use, 480p for mobile 设备s with limited bandwidth, and custom dimensions for specific platform requirements.

Two fit modes

Letterbox mode preserves the original aspect ratio, adding black bars if necessary to fit the target resolution—ideal for maintaining the original composition. Crop mode fills the entire target resolution by removing edges—useful for creating square crops from 16:9 videos or adapting to different aspect ratios while keeping the image prominent.

File size reduction

Downscaling resolution dramatically reduces file size. A 4K video (3840x2160) downscaled to 1080p (1920x1080) cuts data by roughly 75%, and further downscaling to 720p reduces data by 84%. For distribution on limited-bandwidth networks or 设备s with storage constraints, resolution reduction is essential.

Common scenarios

Content creators downscale 4K camera footage to 1080p for web streaming and YouTube 上传s, mobile app developers resize videos to phone-optimized resolutions, website owners reduce video dimensions for faster loading, social media managers scale videos for platform-specific requirements, and archivists preserve videos at multiple resolutions for different access 设备s.

Quality vs. size trade-off

Lower resolutions 创建 smaller files that load faster but show less detail. The right resolution depends on your use case—web streaming at 720p balances quality and speed, mobile at 480p prioritizes bandwidth, and archival at 1080p or higher preserves detail for future use.

Real-time conversion

Conversion plays your video in real-time using canvas rendering and MediaRecorder, showing progress. A 5-minute video takes roughly 5 minutes to resize, with estimates provided before processing.

浏览器-based resizing

All resolution conversion happens locally in your 浏览器. Your video stays on your computer—no server 上传s, complete privacy, instant processing.

Preview in格式化ion

The tool shows original and target dimensions before 转换ing, so you understand exactly what changes are happening. File size estimates let you predict the result.