How to Add Custom Image Sizes in WordPress?

Key Takeaways

  • Nexter Extension allows users to add custom image sizes easily in WordPress.
  • Users can register custom image sizes by enabling a toggle in the Nexter Extension under Performance settings.
  • Custom image sizes can be generated by specifying image name, width, height, and crop type before saving.
Table of Contents

When you are creating your website the default image sizes provided by WordPress may not always fit the requirements of your website design. In such cases, custom image sizes can be added to your website to ensure that the images are displayed in the right size.

To add a custom image size in WordPress you have to use third party plugins or custom coding, but if you are using the Nexter Extension (Free) plugin, you can easily add different custom image sizes as per your requirement in your WordPress website.

 

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How to Register Custom Image Sizes with the Nexter Extension?

To add a custom image size with the Nexter theme, from the WordPress Dashboard, go to Nexter > Extensions > Performance.

Then go to the Register Custom Image Sizes section, enable the toggle, and click on the gear icon (⚙).

register custom image sizes settings new 1

It will open the Register Custom Image Sizes popup.

In the Image Name field, you have to add an image name. 

Then in the Width and Height fields, you have to add your desired image width and height respectively.

After that, you have to select the image crop type from the Crop dropdown. 

Once done click on the Save button and your custom image size will be generated.

This way, you can easily generate multiple custom image sizes.

You’ll see your custom image sizes in a section below, from there you can delete your custom image sizes as well.

About the Author

Photo of Aditya Sharma CMO of NexterWP
CMO at POSIMYTH Innovations · NexterWP · 7 years experience

He has spent years in the WordPress ecosystem building, breaking, and optimizing sites until they actually perform. He works at the intersection of speed, growth, and usability, helping creators ship websites that load fast and convert. An active WordPress community contributor sharing through tools, tutorials, and direct collaboration. Tested practice, not theory.

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Related Frequently Asked Questions

What should I do if my custom image size isn't showing up in WordPress?

If your custom image size isn't appearing, ensure that you've saved the settings correctly in the Nexter Extension. After registering the custom size, regenerate thumbnails to apply the new dimensions to existing images. This can be done using a plugin like Regenerate Thumbnails, which helps to update all images with the new sizes you've created.

What are the best practices for setting custom image sizes in WordPress?

When setting custom image sizes, consider the context in which the images will be used. Aim for dimensions that balance quality and file size to enhance page load speed. Additionally, use the Crop feature wisely to maintain aspect ratios, especially for images that will be displayed in a fixed space. This helps avoid distortion and ensures a professional appearance.

How do I delete a custom image size in the Nexter Extension?

To delete a custom image size, navigate to the section where your registered custom sizes are listed in the Nexter Extension. There, you will find options to remove any sizes you no longer need. This helps keep your media library organized and prevents unnecessary clutter from unused dimensions.

Does the Nexter Extension require coding to add custom image sizes?

No, the Nexter Extension simplifies the process of adding custom image sizes without the need for coding. By using the user-friendly interface within the Nexter Extension, you can easily register new sizes directly from the WordPress Dashboard, making it accessible for users of all skill levels.

Last reviewed: April 14, 2026

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