Responsive srcset width planner

How to use the Responsive srcset width planner

What does the Responsive srcset width planner do?

Generate practical image widths up to a source maximum; It applies this page-specific rule: candidate widths are useful multiples of layout width, capped by the source image width.

Which inputs does this tool use?

To generate practical image widths up to a source maximum, enter Layout width (px), Source width (px); keep every value in the same example; select Calculate when the values are ready; Start with a familiar case covered by this rule - The output uses width-descriptor syntax such as 800w for an HTML srcset plan - so the expected result can confirm the settings.

How should the tool result be read?

For a result intended to generate practical image widths up to a source maximum, the output uses width-descriptor syntax such as 800w for an HTML srcset plan; read source width (px) together with the original layout width (px) rather than as an isolated answer, and confirm that its units or structure match the intended use.

What calculation does this use?

When the goal is to generate practical image widths up to a source maximum, candidate widths are useful multiples of layout width, capped by the source image width.

Why might a real result differ?

When using the page to generate practical image widths up to a source maximum, real breakpoints should reflect measured layouts, device pixel ratios, art direction, and image compression.

Limits and accuracy

When using this tool to generate practical image widths up to a source maximum, real breakpoints should reflect measured layouts, device pixel ratios, art direction, and image compression; the result is an estimate unless every source value is known; codecs, metadata, overhead, and variable bitrates can change an actual file; keep layout width (px) until the output has been checked in its intended destination.