Create effective web posters with AI prompts, mobile-first hierarchy, channel ratios, and publishing checks.
2026.07.16






A Web Poster prompt directs an image model to build a single digital promotional graphic for announcements, launches, events, or campaigns. It accounts for the fact that viewers usually encounter the design on a phone or in a fast-moving feed, so the prompt defines the order of headline, hero visual, decision details, and call to action. Stating the audience, placement, and intended response produces a more usable result than merely asking for an attractive background.
Useful applications include product announcements, online seminars, school notices, ecommerce promotions, performance teasers, and community recruitment. A square or portrait feed post, a 9:16 story, and a wide website banner require different safe zones and information density. Recompose the hierarchy for every channel rather than stretching one master image across incompatible ratios.
The headline and hero visual should identify the subject immediately, followed by decisive information such as date, benefit, venue, or deadline and then a visible action cue. Limit the hierarchy to a few levels because long copy and decorative details compete on a small display. Direct the model to preserve contrast, breathing room around the title, and a minimum logo area so the message remains recognizable after reduction.
Specify publishing channel, final pixel dimensions, audience, exact headline, visual treatment, brand palette, date, action phrase, and logo position. Reserve a calm text zone and keep essential elements away from crop-prone edges. When generating alternatives, change one axis at a time, such as palette, photographic versus illustrated treatment, or headline alignment, so stakeholders can compare meaningful options.
Replace provisional AI text with approved copy and preview the artwork at physical phone size. Confirm that the subject and next action are understandable within seconds, then verify dates, prices, URLs, account handles, portrait rights, asset licenses, logo integrity, and destination pages. Compare JPG and PNG exports, test platform compression for small-text damage, and derive every channel version from one approved master.
Related prompts: