Where the 16:9 aspect ratio is used
16:9 is the standard shape of HD and 4K video. A video in this shape fills a landscape phone, TV or monitor without black bars, pillarboxing or cropping.
- Video platforms: The default player shape on YouTube, Twitch and Vimeo.
- Display hardware: Most desktop monitors, laptop screens and smart TVs.
- Presentations: The default slide size in PowerPoint, Keynote and Google Slides.
- Gaming and streaming: The usual capture size in OBS Studio and capture cards.
16:9 resolution cheat sheet
| Name | Width × height | Typical use |
|---|---|---|
| 720p HD | 1280 × 720 px | YouTube thumbnails, standard web video |
| 1080p Full HD | 1920 × 1080 px | Standard YouTube uploads, slides, most monitors |
| 1440p QHD | 2560 × 1440 px | High-refresh gaming monitors, sharp wallpapers |
| 4K UHD | 3840 × 2160 px | 4K video production and 4K TV playback |
Tip: For YouTube thumbnails use 1280 × 720 px (at least 640 px wide) and keep the file under YouTube's 2 MB limit.
How to calculate 16:9 dimensions
Height = width × 9 ÷ 16. Width = height × 16 ÷ 9. Round to whole pixels; many video encoders also need even numbers.
CSS for a 16:9 box
.media { aspect-ratio: 16 / 9; width: 100%; }