What is an aspect ratio? Proportions, pixel dimensions, cropping, and stretching
Understand aspect ratios versus resolution through landscape-to-portrait conversion, including crops, bars, expansion, safe areas, and display checks.
Understand the concept
Aspect ratio is width relative to height: 1920×1080 and 1280×720 are both 16:9 with different pixel counts. It is not resolution or quality. Cropping, expansion, and bars change framing, while stretching can distort subjects. Verify model support, actual files, and display rather than prompt wording alone.
The same ratio can have different pixel counts
16:9 is a proportion rather than a high-definition guarantee; squares can use many sizes. File size also depends on encoding. MDN defines ratios and Google lists model support, which does not limit the concept itself.
Display settings can also affect presentation. This explains relationships without transforming media or testing platform crops. Inspect output dimensions after selecting a generation ratio.
Cropping, bars, and outpainting change content differently
Portrait conversion can remove side content, preserve it with bars, or synthesize surrounding content. Choose deliberately rather than stretch people to fill space. Leave space for text and product edges to avoid display occlusion.
Outpainting is synthetic, while cropping can remove factual context such as chart axes. Compare originals. Correct dimensions do not establish preserved information.
Check subjects and readability at the target display
Check thumbnail and full-view cropping in the target container. This is a test design without uploads. Inspect heads and caption safe areas under automatic adaptation rather than only editor previews.
Generation ratios can interact with references. Record actual output and verify interfaces. Accept dimensions and information together rather than treat ratio as quality. Recompose and check each version instead of assuming arbitrary crops work.
Checked sources
These sources support the concepts and methods described here. Examples and test scope are labeled separately; check the version of the tools you use.