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5 Best Free Image Optimization Plugins for WordPress

Jun 24, 2024

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Is your website stuck in slow motion? We’ve all been there – waiting impatiently for pages to load. Often, the culprit is unoptimized images.

Images are essential for engaging users and showcasing your brand. But bulky, unoptimized images can backfire, dragging down your website speed and frustrating visitors. Fortunately, image optimization can save the day! With the right tools, you can unlock a world of benefits and keep your website running smoothly.

Get ready to discover the 5 best free image optimization plugins and start climbing the ranks without spending a penny!

Why Optimize Images in WordPress?

Image optimization involves shrinking the file size of your images without sacrificing quality, making them lighter and faster to load for your visitors. Here are some benefits to optimizing images in WordPress –

  • Enhance the user-experience by making your website lightning-fast. Studies show users abandon websites that take longer than a second to load, which leads to a twofold blow: dropping conversion rates (meaning fewer sales or sign-ups) and higher bounce rates (visitors leaving without exploring your site).
  • Reducing image file size is a great way to save server space. Optimizing website images keeps them looking great while significantly reducing their file size.
  • Reaching the top of search results is a competitive battle. While many factors contribute to SEO success, a fast-loading website is an absolute must-have.

5 Best Free Image Optimization Plugins for WordPress

1. ThumbPress

thumbpress image optimization plugin


Stop wasting valuable server storage and improve website performance with a comprehensive image optimization plugin. ThumbPress is a compact powerhouse that tackles every aspect of image optimization. Its mind-blowing features cater to all your needs, making website images lightweight and perfect for WordPress.

From disabling unnecessary thumbnails and regenerating existing ones to converting images to the WebP format, ThumbPress has it all.

Plugin at a Glance

ThumbPress is your one-stop shop for image optimization, packed with features to keep your WordPress site running smoothly and looking sharp – all in a compact and user-friendly package.

Looking for a plugin that will give you control over thumbnail generation? ThumbPress can do just that with Disable Thumbnails and Regenerate Thumbnails feature to effectively rid of unnecessary thumbnails. If you want consistent image sizes on your website, you can use the Image Upload Limit feature to do exactly that!

ThumbPress prioritizes image security as well. The free Disable Right Click feature protects your images from unauthorized downloads to help your maintain complete control over your content!

Finally, experience the flexibility of using next-generation image formats. ThumbPress comes with a Convert to WebP feature, which instantly converts your PNGs and JPGs to WebP format. This significantly reduces file size without sacrificing quality and translates to a lightning-fast website that keeps your visitors engaged at all times!

What Impressed Us

  • Compact image optimization tool.
  • Easy control over thumbnail generation.
  • User-friendly interface.
  • Value for money.
  • Essential features are free.
  • Bulk image conversion while uploading.

What We Didn’t Like

  • Too many modules to keep track.
  • Does not create a backup of the original image.


The core plugin is free; you can get ThumbPress Pro only for $39/year and the lifetime package is just $99.

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2. Optimole

Optimole image optimization plugin


Optimole is a fully automated solution that utilizes cloud servers to store and deliver perfectly optimized versions of your images. Gone are the days of manual resizing or worrying about compatibility – Optimole adapts images to each visitor’s browser and viewport size to ensure a smooth experience on all devices.

What Impressed Us

  • Optimized images are served in real-time.
  • Gain access to both CDN and AWS CloudFront.
  • Lower image quality automatically for a slower internet connection.

What We Didn’t Like

  • The free version is limited and might not serve its purpose.
  • Significantly reduces the website’s speed.
  • Pictures stored in cloud storage may get deleted once you disable the plugin.


Optimole is a freemium plugin. Premium starts at $19.08/month, which is limited to 40,000 visits. 

3. Robin Image Optimizer

Robin Image Optimizer


Robin Image Optimizer is a user-friendly plugin uses third-party servers to deliver exceptional image optimization for your WordPress site. It lets you tackle entire image libraries at once to free up valuable server space in a flash.

Also, Robin Image Optimizer expertly reduces the file size of these popular image formats without compromising quality. But its main selling point is its background image optimization feature.

What Impressed Us

  • Optimize unlimited images.
  • Backups are taken before your images start optimizing.
  • Ability to remove the metadata of an image.

What We Didn’t Like

  • The free version only lets you optimize images of a limited size.
  • Delayed optimization for larger files.
  • Only works for JPG and PNG in the free version.


Robin Image Optimizer is a freemium plugin. Premium costs $39/month, which is limited to only 5000 images. 

4. Image Optimization For SEO

Image Optimization for SEO


Image Optimization for SEO tackles two crucial aspects of website success: image performance and SEO visibility. It also offers a user-friendly interface for resizing and compressing your images to ensure optimal loading speeds.

The plugin allows you to quickly edit image alt text and titles directly within the interface without the need for coding knowledge.

What Impressed Us

  • Insert dynamic titles and tags for better SEO.
  • Responsive dashboard.
  • User-friendly interface.

What We Didn’t Like

  • Extremely limited features.
  • No room for versatile usage.


Image Optimization for SEO is a completely free plugin.

5. Imagify



Imagify is a fully automated image optimization plugin that starts optimizing images as soon as you install it. This advanced algorithm covers different aspects of image optimization and it’s popular among users because it gives them the flexibility to maintain the desired quality of their images.

What Impressed Us

  • Supports image resizing, such as cropping, specifying height and width, etc.
  • Creates backups before compressing images.
  • You can choose different levels of image compression.

What We Didn’t Like

  • You can optimize only 20 MB of images with the free version.
  • The free version is not compatible with high-quality images.
  • Slow optimization processing.


It is a freemium plugin. Premium costs $9.99/month

How to Pick the Perfect Image Optimization Plugin

There are a few things you need to consider before you can choose the best image optimization plug. Here’s a quick guide:

  • Image Optimization Methods

When it comes to image optimization, there are two main strategies: tackling images after they’ve been uploaded, or optimizing them during upload. The ideal solution? A plugin that offers both!

Look for an image optimization plugin that provides the ultimate convenience – bulk compression and the ability to optimize images as you upload them.

  • WebP Conversion

High-traffic websites demand a lightweight solution, and WebP is the answer. This innovative image format delivers exceptional quality at a fraction of the size compared to traditional JPGs and PNGs. WordPress has recently started supporting WebP images and you can take advantage of this.

Use an image optimization plugin that offers WebP conversion. These plugins let you to choose between traditional formats and WebP and optimize images for maximum performance.

  • Feature-Rich

Plugins with multiple image optimization features in one place are an excellent choice. Using a feature-rich plugin means you can eliminate the need to download several plugins for individual tasks.

Over time, it will save you time and help you stay organized!

  • Image Backups

Using an optimization plugin that takes a backup of your images is a much safer option. You can revert the images anytime and optimize them to your liking.

Also, if there’s an issue with the plugin, you can easily restore your images. While some plugins save optimized images on a third-party server, making the website lighter, you risk losing those images if you remove the plugin.

Wrapping Up

Optimizing images for your WordPress site is essential for maintaining a light, SEO-friendly website and boosting user experience. Routine image optimization will be your best ally as you climb the ladder to success.

While many top-ranked image optimization plugin are premium, there are also numerous free plugins that offer excellent image optimization capabilities. Also, these free plugins often have premium services if you’re looking to take your optimization efforts to the next level.

Frequently Asked Questions (FAQs)

Does WordPress Automatically Optimize Images?

Yes, it Does. According to the WordPress Documentation, WordPress compresses up to 90% of uploaded images. However, this doesn’t showcase any major improvement. We highly recommend using an image optimization plugin for that.

How do I optimize an image in WordPress for free?

Use free WordPress plugins or manual tools. You can manually optimize images for free using different tools on the internet. For example, you can compress images using Tiny Image or change the format using various other tools. On the other hand, many plugins offer free image optimization in WordPress. We have listed 5 of the best free image optimization plugins. It is always best to use a WordPress plugin for image optimization. 

How do I improve image quality in WordPress?

  • Upload good-quality images on your WordPress site
  • Optimize images before publishing
  • Resize images
  • Choose the right image format
  • Edit the image if needed.

By following these steps, you can deliver and display the best quality images on your website.

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Nowshin Afroj

An experienced writer who's really into WordPress. With a knack for making blogs easy to understand, I am passionate about delivering engaging content. Whether it's simplifying tech talk or sharing insights, I enjoy all of it.

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