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What is 16:9?

16:9 is a widescreen aspect ratio with sixteen units of width for every nine units of height. It is the standard frame shape for HD television and for the 4K UHD and 8K UHD tiers of ultra-high-definition television.

How 16:9 works

A 16:9 frame describes display geometry rather than a particular resolution, codec, or pixel shape. Square-pixel rasters such as 1920×1080 and 3840×2160 express it directly, while anamorphic formats can reach the same displayed shape through pixel-aspect metadata. In production, it usually serves as the presentation canvas onto which narrower or wider source compositions are fitted without changing their internal proportions.

Key facts

  1. The ratio reduces to approximately 1.78:1, but decimal labels are often rounded and should not replace exact rational values in transformation calculations.
  2. A stored raster need not itself measure 16:9 to display that way; non-square sample-aspect-ratio signaling can horizontally reshape it during presentation.
  3. Cinema content wider than 16:9 is commonly letterboxed inside the frame, while 4:3 material is usually pillarboxed unless an intentional crop fills the canvas.

When 16:9 matters

Target 16:9 for conventional television, desktop video, and many streaming presentations. Wider, taller, or legacy sources require cropping, pillarboxing, or letterboxing to preserve proportions.

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