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How to write alt text, produce accessible diagrams, choose images and copyright standards for GOV.UK. Where possible, publish your diagrams using the SVG image format - this will allow users to zoom in and out.
The basics
Sizes required
Images must be 960 x 640 pixels in dimension to be used on GOV.UK. This is a landscape orientation.
Pixel meaning
A pixel (a word invented from 'picture element') is the basic unit of programmable colour on a computer display or in a computer image. Think of it as a logical, rather than a physical, unit of measurement.
No special design skills needed
You don't need graphic design skills or software to resize images to the required specifications.