*** compression only allows you to choose a level from 1 to 100 1 being the poorest quality but most aggressive method, and 100 the opposite. It’s not possible to use Lossless or another less aggressive method to optimize images. ** TinyPNG allows Lossy but it’s the only compression method you can use.

Instead, it compresses all images as much as possible and checks for quality loss to use a less aggressive method. * Imagify no longer has a compression level to choose from. PRO means that the feature is only available if you purchase a plan (paid feature). We’ll also list all the image formats every plugin supports. Basic featuresĪfter seeing what the free plans offer, let’s take a look at the basic image optimization features, the minimum we think any image optimizer should have to speed up WordPress: lossy compression, backup/restore functions, bulk processing and PDF compression. We can see that there are two groups of free plans: the plans that only have a limited monthly quota (ShortPixel and TinyPNG) and the unlimited plans that have a strong limitation feature-wise. Unfortunately, there is no online service for the rest of the tools: Smush, EFree plans: overview and limitations

TinyPNG: Online image compressor available.

Imagify: Online image compressor available.

ShortPixel: Online image compressor available.

Wouldn’t it be nice to be able to see how the optimized images look before going to your WordPress dashboard and installing the plugins? Only three of the contenders offer this option:

We are going to compare ShortPixel Image Optimizer with Smush, ETable of Contentsįeatures comparison Online image compressor In this review, we’ll only focus on local optimization, where the images are compresses on your own server. That’s the case of ShortPixel Adaptive Images, Optimole, WP Compress, Flying Images, etc.

Besides ShortPixel, we looked at other well-known image optimization tools, such as Imagify, Smush and ENowadays there are many other products that use a different approach, like taking the images and storing them on a CDN, from where they will be optimized and served. Our analysis required a thorough exploration of the world of image compression for WordPress, and we did exactly that. Back in 2017, we made a pretty good comparison of image optimizer plugins and services for WordPress, and we found out that ShortPixel was overall the best.

Wordpress best free image optimizer