Image search is an underrated traffic source, and alt text is also an accessibility requirement. Most sites have hundreds of images with none. Exactly the kind of backlog that never gets done by hand.
An exclude list skips filenames or path tokens (logos, favicons, icons). The fallback template is used when AI is unavailable and supports tokens: {post_title}, {site_name}, {filename}.
Under Settings → General → Image SEO, Alt text for new images decides what a new upload gets. From the file name is the default and works without AI. Choose Written by AI (Basic) and your AI writes it shortly after the upload, from the file name and the post the image is in. New images arrive with alt text from day one, and the backlog never rebuilds.
Everything above runs inside your own WordPress admin. From $29/year, with a 14-day refund policy.
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