WordPress is an open source website creation tool, and one of the easiest & popular tools for non-geeks to publish blogs & posts. According to managewp.com, WordPress manages 48% of top 100 blogs including Mashable, New York Times, CNN, eBay, etc. If your website is well optimized and faster, then it will boost your conversions, increase your page views, and scale up your business numbers. We have discussed earlier the importance of image optimization, and its impacts on the website performance. Now, let’s get to some methods to speed up WordPress websites using image optimization.

Why is the speed of a WordPress website necessary?

Users prefer to browse and engage with a faster website. Also, page load speed plays an important role in improving the SEO ranking.

According to the StrangeLoop research which involved Google, Amazon, and other big websites, if a web page load time is delayed by 1 second then it can lead to 11% lesser page views, 16% decrease in customer satisfaction, and 7% loss in conversions. Thus, faster websites are a key to better ranking, increased traffic & conversion numbers, and less bounce rate.

speed up wordpress websites using image optimization
Image depicting the impacts of Page Load Speed Source: Strangeloop

Reasons for slow speed of your website

There are many factors which can slow down your website like slow web hosting server,  wrong WordPress configuration, big & unoptimized images, bad plugins, and external scripts. There are many third party tools you can use to check the website speed and possible bottlenecks.

But here we will talk about the image optimization in details. I will tell why this is important.

According to HTTP Archive, Images cover around 64% of a website’s weight. Reducing the size of these images without compromising the quality is a challenging task, but most rewarding. So, let’s discuss some methods to optimize images on a WordPress website:

How to Optimize Images in a WordPress Website?

There are two methods of image optimization in a Wordpress website. One is using plugins, and second is real-time image optimization.

Some popular free plugins which can be used to optimize images are:

WP Smush

WP Smush is one of the popular Wordpress plugins for image optimization. It compresses all types of images like jpeg, png, and gif up to 32MB. It provides bulk smushing up to 50 images at a time in just one click.

If you have already uploaded your images, then you can smush the images in the Media section. But it only reduces the size of the image by 20-30% and delivers the quality image. If you are uploading high size images like 2MB. then it can be reduced up to 1.7 MB only.


  • Optimize your images using advanced lossless compression techniques.
  • Process JPEG, GIF, and PNG image files.
  • Bulk optimization for the whole media library.
  • Optimize any image in any directory.
  • Over 2.7 million downloads.
  • No compilation and installation of any binaries are necessary.


  • The bulk option is limited to 50 files at a time in the free version.
  • The free version only supports lossless compression. With lossy compression, you can achieve an even higher reduction.
  • Doesn't support new image formats like webp.
  • Does not support browser-based image format selection, means as a developer you will have to make sure images are stored in the right format as per the content.
  • Doesn't support real-time resizing parameters.

EWWW Image Optimizer

After proper set-up, it will automatically optimize images as you upload them.


  • Optimization process takes place within your own server, making it faster.
  • Supports JPG, PNG, or GIF files.
  • Bulk optimization for the whole media library.
  • Allows lossy compression in the free plugin.


  • It needs several pre-compiled binaries, which must be installed from your local WordPress folder.  For some users, this becomes difficult if they don’t have permission to execute the files.
  • It doesn't support new image formats like webp.
  • It does not support browser-based image format selection.
  • Doesn't support real-time resizing parameters.

Kraken.io Image Optimizer

This plugin allows you to optimize and resize new and existing WordPress image uploads through Kraken.io Image Optimizer’s API.


  • Both lossless and lossy compression are supported.
  • Supports JPEG, PNG, and GIF (including animated GIF).
  • No compilation and installation of any binaries are necessary.
  • Bulk optimization of images in Media library is possible.


  • With a free account, you only get 100MB of testing quota.
  • Doesn't support new image formats like webp.
  • Does not support browser-based image format selection.
  • Doesn't support real-time resizing parameters.

Best Method to Optimize Website Images

All these plugins optimize images as you upload them, and then serve the optimized version to your visitors. With this traditional method, the certain type of advanced optimization is missed.

The best way to optimize images is using real-time image optimization.

ImageKit provides an instant and real-time URL-based image resizing, optimization, and smart cropping with super fast delivery. ImageKit generates different variations and sizes of an image directly from its URL. It doesn't require uploading an image to a third party and then downloading the optimized version.

image optimization for wordpress

Features of Real-Time Image Optimization using ImageKit

optimize images on wordpress website

Imagekit delivers the smallest sized images with the best quality

  1. ImageKit delivers the smallest sized image without reducing the visual quality. It can reduce more than 50% of the image size, and automatically select the best format as per the user device, quality settings, and image content.
  2. It is compatible with your existing Amazon S3 bucket, WordPress website, Magento, Shopify, or any web server.
  3. It just takes 5 minutes to integrate your WordPress website with ImageKit and to get benefits of ImageKit plugin.
  4. With a global CDN, faster delivery of images across the globe makes your website load faster.
  5. By using such an efficient way of image optimization using ImageKit, you can improve your page load speed, SEO ranking, and thus, can enhance your website performance.

These are some of the features of ImageKit which can speed up your WordPress website and boost your performance numbers. Try ImageKit, you can sign up for free! Contact us for any assistance and/or questions.