WordPress Image Sizes: Understand Default Image Sizes, How to Change Them + Best Plugins

WordPress comes with a set of default image sizes that are used when you upload an image to the media library. These sizes are used when displaying images in your posts and pages, and they can be changed to suit your needs.

The default image sizes are:

• Thumbnail: 150px x 150px
• Medium: 300px x 300px
• Large: 1024px x 1024px

You can change these default image sizes by going to Settings > Media in your WordPress dashboard. Here you can set the width and height for each of the default image sizes.

If you want to add additional image sizes, you can do so by using a plugin. There are several plugins available that allow you to create custom image sizes and use them in your posts and pages. Some of the most popular plugins for this purpose are:

• WP Image Size Manager
• Simple Image Sizes
• Regenerate Thumbnails

These plugins allow you to create custom image sizes and use them in your posts and pages. They also allow you to regenerate thumbnails for existing images in your media library.

Using a plugin to manage your image sizes is the best way to ensure that your images are displayed correctly in your posts and pages. It also allows you to easily change the image sizes if you need to.
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Handling images in WordPress can be a challenge. If you don’t pay enough to the requirements, you may get a messy website appearance wise or it could even impact the loading time.

Therefore, you need to learn about the default WordPress image sizes and how to change them. Relax, grab your coffee, and let’s get this done!

How Does WordPress Process Images

Once you upload an image to your media library, WordPress will automatically generate additional images with 3 default sizes and store them separately. Therefore, you will see 4 image options when you are uploading an image. These are the thumbnail, medium, large and full-size options. The first three options are called default WordPress images sizes, while the full-size option is the original size that you upload.

WordPress creates these options because using different locations for placing images will require different image resolution. For example, the image resolution in the thumbnail may be different than the image resolution used in the slider. Therefore, you don’t need to edit and resize images manually if you want to use the same images in different places with different resolutions. Only one image is needed and WordPress will do the rest.

What Are WordPress Default Images Sizes

By default, WordPress comes with three pre-packaged image sizes. They are:

  • Thumbnail : (150px square)
  • Medium size : (maximum 300px width and height);
  • Large size : (maximum 1024px width and height);
  • Full size : (full/original image size you uploaded).

How to Change Default WordPress Image Sizes

Although WordPress already gives you 3 default sizes if you decide that these choices don’t meet your needs, there are alternatives to get the best size for website images. Maybe, you need smaller thumbnails or wider featured images. Therefore, you need to change the default image size in WordPress. To do so, you can follow the steps below:

  1. Go to your Admin Dashboard
  2. Hover your cursor to Setting -> Media
  3. In the Media Settings window, you can adjust the desirable pixels for each size
  4. Hit the Save Changes button to save the setting.
WordPress image sizes media settings

How to Add your Custom WordPress Image Size

So, you have the 3 default sizes. Let’s say you have thumbnail size image for your thumbnail, medium size image for your post’s image, and large size image for your featured image. But, you realize that you need more default image sizes for your pop up banner and widgets. Can you add custom WordPress image sizes? Yes, you can.

Step 1. Add Custom WordPress Image Size: Edit the function.php File

Actually, some themes give you additional size options. But, if you can’t find them, let’s add our own custom image sizes.

  1. Go to your admin dashboard
  2. Hover your pointer to Appearance -> Editor
  3. Edit the functions.php file
  4. Copy the script below and paste it in the file
    add_theme_support( 'pop-up-banner' );
  5. Hit the Update File button.

The script above will activate the add_image_size() function. If this function is already active, you can add new WordPress images such as the following:

add_image_size( 'pop-up banner size', 1000, 590 );
add_image_size( 'widget size', 220, 180 );

In these examples, you’ll to give the additional size name “Pop-up banner size” and “Widget size.” The two numbers following the size name stand for the width and height.

Edit functions.php file and add custom WordPress image sizes

Step 2. Display the Custom Sizes in your Theme

You have successfully added the new custom image sizes. But, it has not been displayed in your WordPress theme. Now, you have to enable the new sizes in your theme.

First, make a backup of your site before you make any changes. Access your theme file inside the post loop and edit it. Then, paste this code;

<?php the_post_thumbnail( 'your-specified-image-size' ); ?>

You should change ‘your-specified-image-size` with the name that you set in the previous step. For example, you can change it into ‘pop-up-banner size’. After following these steps, you can find pop-up-banner size options when you upload images to your media library.

Useful Plugins

You have set a new custom image size in WordPress. But, this change won’t affect your previous images. So, you need to regenerate your previous custom image sizes.

Luckily, you don’t need to do it one by one manually. There is a plugin named Regenerate Thumbnails that will help you to update your previous image size. Follow the steps below to do this.

  1. Go to your admin dashboard
  2. Click Plugins -> Add New
  3. Type Regenerate Thumbnails in the search bar.
  4. Install and Activate the plugin
  5. Now, go to Tools-> Regenerate Thumbnails
  6. Click the Regenerate Thumbnails For X Attachments Button
  7. Now, all your earlier uploaded images will be regenerated to new image settings.
WordPress regenerate thumbnails instructions

Conclusion

WordPress image sizes look like a trivial thing, but in fact, can give you a headache. Sometimes you will find that the image file you upload doesn’t fulfill the desired size that you want.

To solve this, you can try two methods. You can change the default WordPress image sizes or add custom image sizes. Before you set up the new size, remember that uploading big images with a high resolution is not a good idea. Large size images will take up a lot of space and slow down your site’s loading time.

We hope this article helps you to choose the right images, in the right place, with the right sizes. See you!

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WordPress Image Sizes: Understand Default Image Sizes, How to Change Them + Best Plugins

When it comes to managing images on your WordPress website, understanding the default image sizes and how to change them is essential. Not only will this help you optimize your images for better performance, but it will also ensure that your images look great on all devices. In this article, we’ll explain what WordPress image sizes are, how to change them, and the best plugins to help you manage them.

What Are WordPress Image Sizes?

WordPress image sizes refer to the dimensions of an image that is uploaded to your website. By default, WordPress will create several copies of each image you upload, each with a different size. These images are then used in various areas of your website, such as featured images, post thumbnails, and more.

Default WordPress Image Sizes

By default, WordPress creates three image sizes for each image you upload: thumbnail, medium, and large. Here’s a breakdown of the default image sizes:

  • Thumbnail: 150px by 150px
  • Medium: 300px by 300px
  • Large: 1024px by 1024px

These sizes are used in various areas of your website, such as featured images, post thumbnails, and more. It’s important to note that these sizes are just the defaults. You can change them to whatever you want.

How to Change WordPress Image Sizes

If you want to change the default image sizes, you can do so by going to Settings > Media in your WordPress dashboard. Here, you can change the default image sizes for thumbnails, medium, and large images. You can also add additional image sizes if you want.

Best Plugins for Managing WordPress Image Sizes

If you want to take your image management to the next level, there are several plugins that can help. Here are some of the best plugins for managing WordPress image sizes:

  • Regenerate Thumbnails: This plugin allows you to regenerate all of your images with the new sizes you’ve set.
  • WP Smush: This plugin helps you optimize your images for better performance.
  • EWWW Image Optimizer: This plugin helps you optimize your images for better performance and reduce their file size.
  • Imsanity: This plugin helps you automatically resize large images to more reasonable sizes.

Conclusion

Understanding WordPress image sizes and how to change them is essential for managing your images. Not only will this help you optimize your images for better performance, but it will also ensure that your images look great on all devices. We hope this article has helped you understand WordPress image sizes and how to change them.

Jaspreet Singh Ghuman

Jaspreet Singh Ghuman

Jassweb.com/

Passionate Professional Blogger, Freelancer, WordPress Enthusiast, Digital Marketer, Web Developer, Server Operator, Networking Expert. Empowering online presence with diverse skills.

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Jassweb always keeps its services up-to-date with the latest trends in the market, providing its customers all over the world with high-end and easily extensible internet, intranet, and extranet products.

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