Check an image URL and ad copy before building an ad

Fetches a public image URL and reports whether it is reachable, what type and size it is, and its pixel dimensions, then checks any ad copy against Meta's length guidance. Use when: the user supplies an image URL or ad text, always before meta_create_image_campaign. The create tools refuse a link that is not a reachable image in their preview, before anything exists; checking here first saves a round trip. Do not use for landing page quality or policy review — this checks that the file exists and fits the format, nothing about its content. Returns dimensions when the file is a PNG or JPEG, plus warnings for anything Meta is likely to reject or crop: too small, wrong aspect ratio, unsupported type, or copy that will be truncated in the feed. Costs nothing and calls no ad platform, so run it as often as needed.