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Also, does this option work for PNG image format? Thanks
Hello @ralesasa34,
Thank you for contacting Rank Math support.
The Add missing ALT attributes and Add missing TITLE attributes options in Rank Math are not added to your images in the media gallery as the feature works only on the fly (applied on the front end when your page loads on the browser).
Also, images added by your WordPress theme or page builder to various sections like your sliders, thumbnails, icons, etc. will not be affected as they only apply to images added directly to your content.
Here’s a link for more information:
https://rankmath.com/kb/image-seo/#missing-alt-attributes
Hope that helps.