Good questions

No. ImgCrisp saves the same picture in lighter formats. If an image can’t get smaller without a visible change, the original is kept, and you aren’t charged.

Find the image in the ImgCrisp report and press Restore original. The backed-up original comes back and WordPress rebuilds its sizes. For an upscaled image, posts that were switched to the upscaled file need a quick edit afterwards.

No. Compression runs on the ImgCrisp service, not your hosting. If the service is busy, images wait their turn instead of failing.

Yes, when it can make them smaller: the lighter file takes the original’s place, at the same address. Before that, the untouched original is copied into a backup folder on your own site, so you can always go back.

Switch on Optimize new uploads automatically in Settings and each new image is optimized as it is uploaded. It is off until you choose; with it off, Bulk Optimize picks up new images whenever you run it.

One optimization covers an image with all its sizes and formats: 30 credits. An AI upscale is 210 credits, shown before you confirm. Images that got no smaller cost nothing.

Yes: 50 images over 30 days, with no card needed. It starts when you connect your first site and is shared across your sites. AI upscales are not part of the trial.

No. One optimization covers an image in every size and every format, for 30 credits.

Yes. Credits are shared across all the sites you connect.

No. The plugin is free and complete. Credits pay for the work the ImgCrisp service does on your images.

It works with standard WordPress images in any theme, including images a theme prints at full size. With Yoast, share previews and image sitemaps get the lighter files too.

JPEG, PNG, WebP and AVIF, up to 50 MB each. GIFs, SVGs and other types are left as they are, and the report marks them skipped with the reason.

Images a builder outputs through WordPress’s own image functions get the lighter files like any other. The scanners only read standard post content, so they don’t see layouts a builder stores elsewhere.

Only for images stored in your own uploads folder. If a plugin moves your media to cloud storage or rewrites image addresses to a CDN’s domain, ImgCrisp won’t switch those images to WebP or AVIF.

Not yet. ImgCrisp isn’t built or tested for WordPress multisite networks.

Run one at a time. Two plugins compressing and rewriting the same images work against each other, so switch off the other plugin’s compression and WebP delivery first.

The image being optimized, its file name, your quality and format settings, and your API key. Never your posts, your visitors’ data or anything else on your site.

On the ImgCrisp service. For an AI upscale, the service passes that one image to the specialist provider that runs the upscaling model. The privacy page names every company involved.

Fullspec Studio, a small WordPress and SEO studio. We built it for our own clients’ sites first.

Write to us from the contact page. Messages go to the people who build ImgCrisp. For a problem with the plugin, attach the diagnostics file from ImgCrisp, Settings: it shows us what’s wrong without access to your site.