Best Image Optimization Plugins for WordPress: Ten Options Compared

ShortPixel offers lossy, glossy and lossless modes for JPG, PNG, GIF, WebP, AVIF and PDF, with WebP and AVIF generation, automatic resizing, bulk and background processing, WP-CLI, restorable backups, exclusions and a built-in CDN. A credit is used per optimised image or thumbnail, but only if the file shrinks by at least 5 percent.

Monthly credits expire after 30 days while one-time packs do not. When the free quota runs out, optimisation pauses. The pricing page I read showed no prices, a general refund policy is not stated, and the plugin page contradicts itself on thumbnails per image, which changes how many credits you need. AI features are listed, but whether they share the credit pool is unclear.

It suits owners who want fine control and can estimate credits, including thumbnails.

Imagify counts megabytes rather than images. The free plan covers about 200 images a month with a 2 MB limit per image, Growth gives 500 MB, and Infinite is unlimited with no upload size limit. All plans allow unlimited sites, and you can upgrade, downgrade or cancel at any time.

The page shows two prices per plan without labels; I read the higher as regular and the lower as sale, but the page does not say so, nor whether the sale price applies to renewals. No refund policy is stated, and the image estimates for the 500 MB plan are not explained.

It suits owners who want a simple unlimited tier at a low yearly price and can check renewal terms.

The free plugin optimises JPG, PNG, GIF and SVG losslessly, converts to WebP, offers lazy loading with auto-scaling, bulk optimisation, resizing, WP-CLI support, local backups and email support. It can run local tools on your server, or use a free compress API where the server cannot. The listing says WebP conversion averages 60 percent savings and lossless optimisation 8 percent, vendor claims I did not test.

Premium and cloud options add stronger optimisation, PDF optimisation, WebP and AVIF delivery, a CDN, cloud backups and a bundled performance plugin. No prices are shown, the pricing address redirected without plan details, and AVIF is described both as part of Easy IO and as premium.

It suits owners who want solid free local optimisation and can check premium pricing separately.

Optimole delivers images through a CDN, with automatic compression, adaptive resizing, retina support, lazy loading and WebP and AVIF chosen by browser support. Plans are limited by monthly visits, where a visitor counts once per day, rather than by image count. The free plugin page says an optional badge can add extra free visits.

The pricing page I read showed no prices, only the visit limits and a yearly saving of 20 percent with blank amounts. The meta description says “Unlimited traffic” while plans have visit caps, the overage answer is missing, and “free plan with all features” conflicts with a Pro label on image offloading.

It suits sites that want images served and resized by a CDN without managing files.

The free plugin compresses images on upload, in bulk or per image, supports directory compression, lazy loading for images and embedded video, and a free “super” compression that needs a connection to the vendor’s hub. It does not delete originals and, by default, compresses resized versions, with full-size compression reserved for Pro.

Pro adds WebP and AVIF conversion, a global image CDN, automatic resizing and image preloading. The directory page is unclear about a free bulk limit, whether local WebP is free or Pro, and what the free super compression allows. I did not see Pro pricing.

It suits owners who want a familiar free plugin with lazy loading and can check Pro terms.

The API is priced per compression with no subscription: 500 free each month, then $0.009 each up to 10,000 and $0.002 above. The WordPress plugin compresses WebP, JPEG and PNG, and the page does not list AVIF for the plugin.

The page does not say whether plugin usage counts against the same free quota, whether the 500 free count toward the 10,000 threshold, or how bundles are priced, and several FAQ answers were blank.

It suits sites with occasional uploads that prefer paying only for what they compress.

The plugin’s free image features include compression from maximum saving to best quality, WebP conversion, auto-compression of new uploads, bulk compression and restoring originals. Premium features include lazy loading and removing orphaned images and unused image sizes.

The directory page is unclear whether bulk compression is free or Premium, because a changelog entry refers to a Premium bulk compress. The WebP savings figures it quotes are attributed to Google, not to the plugin, and quality levels and formats beyond WebP are not specified.

It suits owners who already use the plugin for database or caching tasks and want image compression in the same place.

web.dev’s guidance on image formats starts by asking whether an image is needed at all, then preferring vector graphics or CSS where possible, and otherwise choosing among PNG, JPEG, WebP and AVIF by transparency, animation and quality needs. Resizing an image to the size it is displayed at often saves more than any plugin setting.

Manual work does not scale to a library of thousands, does not catch uploads by other editors, and does not regenerate thumbnails. Use it as the first step, then add a plugin for the rest. See Core Web Vitals on WordPress and image CDN and hotlinking.

Start here, even if you pay for a plugin afterwards.

The plans page I read for the security comparison did not clearly show which image optimisation features each plan includes; its extracted text left the image rows unclear. I could not confirm what is included, so I score it lower and say so. That is a gap in my reading, not a verdict.

If you already use Cloudflare, check the live plan page for image features and limits. See my best CDN for WordPress comparison.

Some hosts and server stacks offer image optimisation or a built-in image service. What it covers, what it costs and what limits it has differ by provider, and I did not verify any of them for this guide. See the caching comparison in best WordPress caching plugins, which covers server-level tools.

Check what your host offers before you pay for a separate plugin, and make sure you can keep your optimised images if you move.