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How to resize bulk images on WordPress

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Would you like to know how to mass resize images in WordPress?

Sending a heavy or very large image to your blog can slow it down considerably. That's why we recommend that you always optimize your images for the web..

However, if you have a multi-author blog then it can be genuinely difficult to monitor the images your authors send.

Did you know that you can automatically resize images that exceed a certain size even after they have been sent?

This is precisely what we will show in this tutorial.

Remember, I showed you rather how to modify the images in the mass.

But before, if you have never installed WordPress discover how to set up a WordPress blog in 7 steps et How to find, install and activate a WordPress theme on your blog.

Now let's go back to why we are here.

How to install and configure the "Imsanity" plugin

This is of course what you need to do first. I invite you to install the Plugin from your dashboard. You can also download the extension as a zip file directly on

how to mass resize images in WordPress

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After installing and activating the plugin, a new sub-menu will be added to the " Settings " Access it to perform some configuration on the plugin.

imsanity menu-wordpress

On this new page, you can define the maximum dimensions of images in different locations and types. Indeed, you can change:

  • The maximum size of images sent in pages or in comments
  • The maximum size of images sent from the library
  • The maximum size of images sent elsewhere (themes, logos, backgrounds, etc ...).


You can also convert the images to a deprecated format (BMP, PNG) for a much lighter format, namely "JPG".


Do not worry about the previous images that have been sent. You can resize them by searching and resizing the selected images.


Discover also some premium WordPress plugins  

You can use other WordPress plugins to give a modern look and optimize the grip of your blog or website.

We offer you here some premium WordPress plugins that will help you do that.

1. Gryphon SEO Tools

Gryphon SEO Tools is a powerful tool that will allow you to improve the SEO of your website. This premium WordPress plugin requires only a few configurations and will work on mobile devices as well as on desktop computers, regardless of the browser used.

Gryphon AutoBlog SEO Tools wordpress plugin

Its features include: the availability of Readability score test added to posts, aautomatically adds the 'alt' and 'title' tags to all images, fully customizable layout, regular updates, available customer support and plus.

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2. Calendarista

Calendarista is a premium WordPress plugin designed to offer a faster and more efficient online booking experience - Booking - to your customers. Its objective is to make services very quick and easy to add for companies that offer the reservation of sessions or appointments on the internet.Calendarista Premium WP Appointment Booking Plugin and Schedule System plugin wordpress

So if you are looking for a complete reservation system for a hotel, car rental company, apartment rental, travel agency, beauty salon, restaurant, etc.…, this plugin will be perfect for you. 

Read this article on How to display all your WordPress publications on a single page

As functionalities it offers among others: 10 ready-to-use reservation system models, support for 3 payment gateways, WooCommerce support, the integration of a customizable form builder, Google Map support, an excellent calendar template for displaying your appointments, and much more.

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3. MailChimp Comments

MailChimp Comments is a WordPress plugin that allows you to subscribe commenters to your posts / pages via MailChimp . When users comment on something on your website, it's immediately added to your email subscription list.mailchimp comments wordpress plugin for email list

Check out our 8 premium WordPress plugins for SEO of a blog

You can configure the plugin against your users to avoid any violation (spam). MailChimp Comments is a perfect way to build a mailing list of your commenters.

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Recommended Resources

Find out about other recommended resources to help you build and manage your website.

Easily create your Online Store

Download free WooCommerce, the best e-commerce plugins to sell your physical and digital products on WordPress. [Recommended]


Here ! That's it for this WordPress plugin that allows you to automatically resize images. Do not hesitate to share with your friends on your favorite social networks

However, you can also consult our resources, if you need more elements to carry out your projects of creation of Internet sites, by consulting our guide on WordPress blog creation.

If you have suggestions or remarks, leave them in our section Comments.


This article features 7 comments

  1. Hello,

    I myself use the Imsanity plugin on several WordPress and confirm that it is both very useful and very easy to set up / use.
    Do you know of an extension that allows you to display a thumbnail / thumbnail / featured image by default when a post does not have one?
    Thank you in advance,


      1. Hello Thierry,

        This is to display it wherever post thumbnails appear, such as on the blog page and archive pages.
        The goal is to have a default thumbnail even if the article does not include any image and to avoid an awful display on blog and archive pages when the theme used necessarily displays a thumbnail.
        So no, it's not in the sidebar.
        Thank you in advance,


        1. Again sorry for the late reply because we do not work on weekends.

          Ok, I think I know of a plugin that allows displaying a default image in related posts and on the sidebar. But is this really what you want? If so then I will find this link for you.


          1. Hello Thierry,

            No, that's not what I'm looking for.
            Again, this is for featured thumbnails / images that show up on blog and archive pages along with the summary of the latest posts.

            thank you,


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