15 Best Free Image Optimization Plugin WordPress

Nowadays, SEO for multimedia is an expansive matter. Unfortunately, they’re one of the most likely reasons for slow websites. But here is the best free image optimization plugin WordPress.

There are still multiple explanations for adding images to your WordPress content. The visitors will be more engaged if you are using graphics. It can also separate lengthy pieces of content and benefit from SEO. Related: Best WordPress Speed Optimization Plugins.

Multimedia is an essential element of every content marketing strategy. However, a slow webpage is a problem because it can drive away readers. In reality, websites take a few seconds to load.

The probability of a user leaving is higher than usual; as a result, your bounce rate increased. Although many factors can influence your website to slow down, images and video content are significant parts.

What Exactly Is Image Optimization?

You can run image optimization using various approaches, including resizing, compressing, caching, and lazy loading to reduce requests. Also, more than half of all bandwidth is used on most websites. Multiple plugins are available that will perform this task for you effortlessly.

Nevertheless, not all plugins are required at the very same time. I’ll go over some of the significant aspects of choosing a free image optimization plugin; you can also use paid.

Responsive images

Via adaptive image solutions, it can deliver different sized images based on the size or resolution of the access devices. That allows you to increase the average performance of the website by optimizing image output.

Mobile devices need to serve images through adapted images. If you run GTmetrix testing on your site from a mobile phone, you’ll nearly find resized image issues. 

It’s because images are not resized for mobile platforms. Many plugins are available, such as ShortPixel and Optimole, but they are all costly.

Serve Images in Next-Gen Formats (WebP)

Serve Images in Next-Gen Formats In PageSpeed

Next-generation image technologies offer better saving and quality than past formats like JPG or PNG. WebP, for one, can be used to replace JPG, PNG, and sometimes Gifs graphics in certain conditions. It also enables lossy and lossless encoding.

Jpg vs Webp in Gtmetrix

WebP is a Google-developed file type that significantly increases image saving. In truth, WebP is used on YouTube. Chrome, Firefox, Edge, Opera, and Safari have recently been introduced, and a slew of other browsers support WebP properly. Converting images to the WebP format includes lightweight encoding and decoding.

AVIF File Format

Compared to formats like WebP, JPG, PNG, and GIFs, AVIF is compatible with high-definition images. It fully supports the quality and produces smaller files while also utilizing HDR data types. 

It also includes some of the most cutting-edge graphic technology. AVIF is a fast-growing image format around the world. Likely, it will eventually get full support across all platforms.

Defer Offscreen Images

Defer offscreen images in PageSpeed

A few PageSpeed and GTmetrix suggestions are to “defer offscreen images.” When the browser needs to load critical resources, such as graphics below the fold, the page takes longer to load, and visitors cannot interact with the page as fast as they would like.

Deferring offscreen images can improve the outcome of your WordPress website and key metrics like the first input delay and better page loading time.

Properly Size Images (Dimensions)

Images with large dimensions in GTMetrix

Another critical issue with images is that you need to resize huge images to smaller proportions to avoid “properly size images.” in page speed errors and GTMetrix. 

Properly size images in Google PageSpeed

If you’ve previously uploaded large images, you’ll need to resize them manually or use a plugin. Large file sizes images with large dimensions mean the browser needs to adapt the graphic to the site layout. 

It is OK to scale your images properly, but the browser must download additional data when you provide images at their highest screen resolution.

Efficiently Encode Images

Efficiently encode images in PageSpeed

Concern with images is “efficiently encode images,” which indicates that you should compress images. You can reduce your image compression level to around 85 percent of the standard level, which you can do with a plugin or software like Photoshop.

EXIF data

Removing EXIF data” means removing unnecessary data from images. Such as size, names, depth of field, system brand, time, and other useless details. The stuff to remove EXIF data is provided in most image optimization plugins.


Avoid graphics embedded from other websites; they need to be uploaded to your own. Meanwhile, it’s not hosted on your website but comes from somewhere outside. You’ll get a bunch of additional requests, which will significantly slow down your performance.

WordPress Image Optimizer Plugin Free List

In this blog post, I’ll show you how to do and perform image optimization for WordPress. You can pick up a suitable plugin with these recommendations, and your website will thrive from these WordPress image optimizer plugin free.

Related: Best WordPress Hosting Providers.

1. WebP Converter for Media

WebP Converter for Media
WebP Converter for Media

WebP Converter for Media is a plugin for WordPress that is free and straightforward. As a result, you can automatically use this plugin to display WebP for each new and current image on your website.

Currently, this plugin supports your website’s images, gifs, jpegs, and png. You can select image files from specific folders to conversion to WebP format. 

Webp converter for media image quality

However, use this plugin; you have some requirements. You’ll need PHP 7.0 or higher, as well as the GD or Imagick modules. The module must support WebP and essential native PHP additions, which WordPress utilizes to produce images. 

“Mod mime,” “mod-rewrite, and “mod expires” must all be configured on your server.

The Quality feature allows you to customize the image quality before changing to WebP formats. For maximum performance, set the rate at the recommended settings. 

If you increase the quality more than recommended, WebP images will take more space. If you reduce the image size, the image quality will also suffer.

If you configure the plugin’s features correctly, it will convert all of your images to the WebP image format, which you can then save to your media library. 

However, if your website previously included many images, select “Regenerate Images” to convert all the images. It will alter all previous photos to WebP.

WebP Converter for Media Regenerate Images

Your site will stop offering WebP images if you disable or remove the plugin. It will also erase the WebP images from the upload folder. Before deleting the plugin, make sure to download the pictures if you want to keep a copy.

2. WPvivid Image Optimization

wpvivid image optimization
Wpvivid Image Optimization

WPvivid Optimization Plugin allows you to effortlessly compress lazy loading images on your website, reducing loading times and improving user experience and Google and GTmetrix scores. A free image compression plugin WordPress.

Wpvivid image compression resize

You can use free image optimization for up to 2000 images or compress up to 5 gigabytes every month. Without a time limit, it analyzes images automatically. Also, make your web pages load faster by using Lazy Load.

Wpvivid image bulk optimization

WPvivid includes a CDN on your website. You can optimize all of your images in a batch with a click. Create a backup of your originals and recover them if required. Either lossless or lossy compressing options are available.


As images are uploaded, they automatically compress and resize files. You can also resize your existing images in a batch or manually.

WPvivid also offers a pro version that includes no monthly limit, multiple compression levels, a maximum upload size of 32MB, scheduled optimization, white-label, etc.

WPvivid Image Optimization Pros
1. You can run up to 2000 images every month.
2. You can upload images up to 5MB in size.
3. It is optimized without a speed limit.
4. Bulk Picture Optimization
4. Backup and restore the original images.
WPvivid Image Optimization Cons
1. WebP format is not supported in the free version.
2. Customized Compression Level is not supported in the free version
3. You are limited to 2000 images and a maximum file size of 5MB.
4. In the free version, not all image formats are supported.

3. WP Smush

WP Smush
WP Smush

WP Smush from WPMU DEV is a popular WordPress image compression plugin. But the free version’s features are so limited. You cannot access them from the free version in auto-convert, lazy loading, properly sized images, WebP support, backup, and free image compression plugin WordPress.

It is a straightforward method for newbies to compress their images and increase the speed of their websites. All of your pictures will also be compressed up to 5MB in length for free—process all files with PNG, JPEG, and GIF files.

WP Smush settings

However, their free version has notable features such as Bulk Optimize, which lets you compress up to 50 images at one time. Detect and optimize images with incorrect sizes, even if they aren’t in the media library. 

The quality difference isn’t as significant as Smush’s few quality losses; as a result, images are still large. Smush offers users minimal control to compress an image. As it reduces the size of the image, it isn’t the ideal option.

WP Smush Pros
1. Bulk Smush compresses up to 50 images.
2. Smush is straightforward to use.
3. An improper-size image detector is included.
4. Image resizing with max width and height.
5. You can optimize images even not located in the media library.
WP Smush Cons
1. No WebP support in the free version
2. Only lossless compression
3. There isn’t enough compression and flexibility
4. No backup original pictures in the free version
5. Bulk Optimize is only up to 50 images at a time.

4. EWWW Image Optimizer

EWWW Image Optimizer
EWWW Image Optimizer

One of the best image optimization plugins for WordPress is EWWW Image Optimizer. That plugin has been installed on almost one million websites. So that means it isn’t bad. It improves page load by optimizing images and using the free image optimization plugin for WordPress.

You can also optimize images that you’ve already posted. It is allowed to choose the image resolution before compression. It also provides unlimited files and has no frequency limitations.

It includes auto image optimization and an image backup facility. Your existing files are saved for an estimated 30 days. You have to access backups at any time within a month.

Ewww image optimizer bulk optimization
Ewww image optimizer resize images

My favorite feature is that optimization can be timetabled in the backend by adjusting stuff in the plugin. Bulk optimization is also my top choice; you can optimize all pics with a single tap.

All CDNs, such as Cloudflare, KeyCDN, Fastly, and Bunny, operate quickly with bulk CDN. Also, you can clear the cache after a bulk optimization. EWWW IO is compatible with all themes, plugins, and site builders.

EWWW IO plugin is the solution for image errors, such as properly sized images, serving images in next-gen, deferring off-screen, and specifying image dimension errors in GTmetrix.

EWWW Image Optimizer is intended to boost website page load speed and features extensive and flexible image optimization. It can help you save storage capacity even while reducing the overall load on your website.

Maybe you know that the most common reason for a slow website is graphics. Compressing your images for fast loading load times may aid in improving SEO, and it also makes for a good user experience.

1. There is a free version available.
2. It is included in the free versions: Compression, resizing, lazy loading, and others.
3. No limitations to the image files
4. Vast image formats (JPG, PNG, GIF, WebP)
5. Bulk Optimization for all of your images.
1. No option to modify the compression mode
2. Many negative reviews about the crash and loss
3. The free version misses significant features (Auto-Scale, Auto-WebP).

5. ShortPixel Image Optimizer

Shortpixel image optimizer

ShortPixel is one of the most well-known optimization plugins, with over 300K installations. Although the free version is fully functional, you are limited to compressing 100 images per month.

So I’ll simply talk about the free version and skip over the paid version.
It exists in a range of compressed levels. So you can choose from lossless, lossy, or glossy reduction.

Shortpixel compression (lossless, lossy, or glossy)

They follow the same basic approach as some other cloud-based image optimization solutions. Usually, you upload images to the WordPress Media Library. After you request or select the batch optimization feature.

The ShortPixel plugin automatically delivers the photos to cloud services after getting the image from the cloud and stores them in the Media folder, overriding all previous ones. You have the option of keeping the original version.

Shortpixel Cloudflare integration

You can run the ShortPixel plugin on multiple websites and multisite configurations with one API key. Also, the plugins have full Cloudflare integration. You can compress JPG, PNG, and GIF images and PDF documents.

All PNGs are converted to JPEG, significantly reducing the file size, notably if you have PNG-formatted cam photographs. It will also look and replace the image. So generated JPEG is larger than the original PNG, which will not convert the image.

It is easy to experiment and use the plugin since all original images are automatically stored in backup data, which can be recovered quickly, separately, or in the collection.

ShortPixel Pros
1. Choose between lossless, lossy, or glossy
2. Keep a backup of your original images in a separate folder.
3. Automatically convert the PNG images to JPEG.
4. Optimize Media Library items after they are uploaded.
5. Bulk optimization for 100 images from the free.
ShortPixel Cons
1. Only 100 images are available for free each month.
2. Its free versions, such as WebP and AVIF, are not included.
3. It isn’t an exact light-weight plugin.

6. Optimole

Optimole image optimization

Optimole is a multi-functional image optimization plugin. It makes gathering up your extensive images and pages. Optimole utilizes cloud-based tools to increase your pictures in real-time, letting you speed up your website by fixing the image size for each device.

The plugin is available in many plans, such as free, personal, business, and custom. But first, let’s talk about Free Plan: With the free program, you can improve unlimited images for only 5,000 monthly visits.

Each image on your site will be auto-optimized and adapted to the pictures of all visitors to improve the performance and UX. Optimole delivered images via AWS CDN for free.

Optimole customize

The plugin reduces image quality for visitors with slow internet connections. It offers detailed optimal control statistics showing the total bandwidth recovered and the server’s storage capacity.

Optimole resize images

Optimole permits you to customize the improvement of your images. Users can add a personalized watermark image to their pictures to prevent easily stolen. Optimole’s lazy-loading avoids jQuery and other heavy Java scripts.

Optimole Pros
1. It can serve WebP images.
2. The image size is suited to the browser and device.
3. On already lossy compressed images, use Optimole.
4. Optimole does not use jQuery or other weighty JS.
Optimole Cons
1. The free version is limited, and advanced features require a paid subscription.
2. You can only serve images for 5,000 monthly visits with the free version.

7. Rocket Lazy Load

Rocket Lazy Load
Rocket Lazy Load

First, you need to know this is a lazy load plugin for images, video, and iframes, not an optimization or compression plugin. It helps with the decrease of requests, page loading optimization, and the free image optimization plugin for WordPress.

My favorite part of this plugin, which comes from the WP Rocket team, is “Replace Youtube videos by thumbnail.”

Rocket Lazy Load settings

Using YouTube videos for your content is helpful, but they significantly impact your site’s performance, but that is no longer an issue with this plugin; it is just an image format. 

Its lazy load works fine, and it is a free speed plugin for WordPress websites. Nevertheless, a few key features are lacking, such as the option to exclude some images from the lazy load; you can do this yourself, but not with the plugin feature.

Lazy Load Pros
1. Rocket Lazy Load is entirely free.
2. You can lazy load all the images on your website.
3. For your YouTube video, you can use Replace Thumbnail.
4. No jQuery is used.
Lazy Load Cons
1. Some plugins are not compatible.
2. Fewer features
3. Deactivate lazy load for different pages and images; this should be performed manually.

8. Imagify Optimizer

 Imagify Optimizer
 Imagify Optimizer

Imagify is perhaps the most powerful image compression toolkit. That lets you accelerate your WordPress website by using lightweight photographs while still keeping the quality of the image.

 Imagify Optimizer general settings

Imagify does have a free plan as well as several paid options. Both versions offer a similar set of features. The difference between the two versions is the number of images you can optimize.

The free plan lets you optimize 25 megabytes of data each month, almost 50 to 250 images. On the other hand, the paid version starts at 1 GB of images.

GIFS, JPG, PNGS, WEBP, and PDF files can be scaled and reduced. If you have a significant number of pictures to compress, you can use the batch optimization feature to reduce images at once. It inserts multiples in with one click. 

 Imagify Optimization

You can adjust all of your images to WebP, which is a solution to optimization and decreasing page loading times. Imagify’s WebP conversion is automatic and straightforward. 

You can display WebP images in front of users directly, and all images can convert to WebP.

Imagify Pros
1. You can choose from three levels (Standard, Aggressive, and Ultra).
2. The original images are stored as a backup.
3. A batch optimization feature is available.
4. You can convert images to the WEBP format.
5. You can show WebP directly on the website’s front end.
Imagify Cons
1. A free version only permits 25MB per month.
2. You can only compress an image of less than 2MB.
3. For beginners, setup may be complex.

9. reSmush.it Image Optimizer

reSmush.it Image Optimizer
reSmush.it Image Optimizer

One significant benefit is that this plugin can compress unlimited images per route. So simply hit the optimize tab, let it run, and your pictures will be reduced. A drawback is that it lacks different compression levels. So it’s a free WordPress image optimizer.

resmush bulk optimization

This plugin offers no advanced functionality over others; also, there is no support for WebP images, which is a big downside, but it does support JPG, PNG, and GIF images.

The plugin is free; the only limitation is transmitting images below 5MB, suitable for blogs and content-focused websites. You’ll be able to access your original images after optimization. 

Resmush settings

Also, it allows you to optimize images dynamically at upload and provides a batch optimization solution for previous pictures. reSmush Web service lets users choose the compression level for each upload. 

reSmush Pros
1. reSmush offers bulk optimization
2. Backup for your earlier images after processing
3. You can compress unlimited images
4. reSmush is an entirely free, no-paid version
5. Auto optimization for uploading pictures.
reSmush Cons
1. No different compression levels
2. It only files that are less than 5MB in size
3. No WEBP images support
4. Considerable negative feedback for loss of backup.

10. TinyPNG Image Compression

TinyPNG Image Compression
TinyPNG Image Compression

A helpful image compression plugin performs a few functions. It can work with PNG, WebP, and JPG. Moreover, it can reduce the image size to make a significant difference. 

TinyPNG is not a completely free tool. Each month, you can optimize up to 100 images for free. It is easy to use because it works smoothly with WordPress and maintains pixel density for compressing PNGs.

TinyPNG Image Bulk Compression

TinyPNG reduces images using external TinyPNG systems, in which they are optimized and concentrated before being delivered to you reduced and ready to post. 

The optimum method is applied to your image after analysis. A practical method is implemented on your pictures. You can even batch optimize your existing JPEG, PNG, and WebP images.

TinyPNG Image Resize

The output is delivered to your WordPress website, and the original image is substituted with a mini version with no noticeable quality loss.

Its prerequisite is that you sign up for an access code. To receive an API key, you will need to provide your email account. 

After you have your key, you can use TinyPNG on your website to improve the performance. Also, you can use the same key on other websites.

TinyPNG Pros
1. New images are automatically optimized.
2. Bulk optimization for your existing files
3. Support multiple sites with an access code.
4. Fully compatible with WooCommerce
5. Background optimization is available.
TinyPNG Cons
1. You can only optimize 100 images per month for free.
2. The largest canvas size is 256MP.
3. It’s not a full free version.
4. No additional compression levels.

11. Litespeed Cache Image Optimization

Litespeed Cache Image Optimization

The Litespeed Cache plugin includes robust image optimization options if you’re a Litespeed user. With the Cron option, it will perform a Cron job to optimize your pictures each time you add a new image to your library. 

You can use lossless and lossless compression. After reduction, it can increase image quality, and pictures will be bigger than if lossy compression is used. You have complete control over all of these settings.

As part of the Optimal Image Solution, create WebP versions of image files. You can enable it if you want. However, keep in mind that new WEBP files will have more space. But you can delete that if you don’t want to.

Litespeed Image Optimization settings

You can use the WebP file format for JPG or PNG with WebP Replace. If an incompatible browser requests a page using WebP images, LSCache will provide that browser with the unmodified image file format.

There are many other settings in that part, but I won’t go through all of them in this overview.

12. WebP Express

WebP Express
WebP Express

This plugin includes the WebP Integrate tool for converting images in various ways with the WebP. (.htaccess) rules for WebP generation, which allow the different image responses for a jpeg and a png, will result in a WebP on browsers that support it. So it is a free WordPress image optimizer.

13. A3 Lazy Load

A3 Lazy Load
A3 Lazy Load

A3 Lazy Load is a simple-to-use plugin that speeds up the page load time related to the lazy loading of images, videos, and iframes. A3 Lazy Load is the most well-known and most significant advantage is that it is simple to customize even if you do not know.

A3 Lazy Load Images

You can turn on the video in the a3 Lazy Load WordPress dashboard, including embedding, video widgets, text widgets, and HTML. Lazy Load in Iframe a3 Lazy Load has been built-in through any resource in content and widgets, and it will lazy load all iframes. 

14. Flying Images

Flying Images
Flying Images

Flying Images is a fast-loading lazy plugin. If “native” lazy loading is supported on the web page, or standard JavaScript is used for lazy loading. Even before the images are on the screen, Flying Images can load them.

There will be no more blurring when loading images. Flying Images optionally exclude images from the clusters. If your image doesn’t have a data type, this is useful. All images will load without problems in Internet Explorer and Java Script-less browsers.

15. WP-Optimize Compress

WP-Optimize Compress

WP-Optimize includes an image-compression function that utilizes lossy methods to reduce large images. It can compress PNG, JPG, GIF, BMP, and TIF images up to 5 MB in size. It includes bulk compression to reduce multiple images at once.

Overview of WordPress Image Optimizer Plugin Free

So it’s time to end my long content about all these matters. This explanation guide was created to help you learn the core aspects of image optimizing, also for those looking for free optimized images for their WordPress website.

Images improve the readability of a blog article or even any type of content. It also increases audience attention and builds the tone and uniqueness of your webpage. 

Putting graphics into your material can help you elevate your site effectively. However, when you’re not attentive, images can take up over half no, maybe even more of the overall space of our website.

Not all of your readers can have robust internet speeds. As a result, page clutter and slow page loading times might negatively affect your overall SEO ranking. 

It would help if you got into the routine of optimizing your graphics today to help them reduce the loading time. 

Give priority to the sizes of the pictures and adjust those, such as large graphics and digital camera images, because they are very lengthy and huge, so you need to resize them to a more acceptable size.

Finally, use recent image compression tools like Photoshop and cloud-based applications like TinyPNG, CloudConvert, and others, or integrate with plugin to compress images WordPress.

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Madushan Bandara

My name is Madushan Bandara, and I'm a Sri Lankan. I am currently learning about WordPress design and Internet marketing. This website will also serve as a platform for me to share my findings and experiences. 

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