How to Bulk Optimise Images in WordPress?

Key Takeaways

  • Nexter Extension (Free) allows users to optimise up to 500 images per month.
  • Nexter Extension (Pro) enables unlimited image optimisation per month.
  • The optimisation process includes a live progress bar displaying images remaining, skipped images, and total savings.
Table of Contents

If you already have many images in your WordPress media library, with Nexter you can bulk optimise them to reduce their file sizes and improve website performance. Bulk optimisation allows you to process multiple images at once instead of optimising them one by one.

With the Nexter Extension (Free) and Nexter Extension (Pro), you can easily optimise all the images in the media library at once. 

If you are using the free Nexter Extension version, you can optimze upto 500 images per month but with the Nexter Extension pro you can optimise unlimited images per month.

How to Bulk Optimise Images with the Nexter Extension?

To bulk optimise images with the Nexter Extension, from the WordPress Dashboard, go to Nexter >Extensions > Performance.

Then go to the Image Optimisation section abd enable the toggle.

enable image optimise

Then, from the WordPress Dashboard, go to Media >Bulk Images.

On the Bulk Image Optimisation page, you can optimise multiple images from your media library at once.

In the Image Queue section, you’ll see whether there are any images available for optimisation. If there are images remaining, simply click the Start Bulk Optimisation button at the top to begin the process.

Note: If there are no images left to optimise, the Start Bulk Optimisation button will be disabled.

Once started, the system will automatically begin optimising images in batches based on the settings configured in the Nexter Image Optimisation Settings section.

Note: You can click the Image Optimisation Settings button at the top right to configure or update your image optimisation settings.

During the process, you will see a live progress bar showing the overall optimisation progress. It will display useful information such as:

  • Images Remaining – Number of images left to optimise.
  • Skipped Images – Images that were skipped during optimisation.
  • Total Savings – Total file size reduced after optimisation.

At the top of the page, you will also see key statistics, including:

  • Storage Saved – Total storage space saved after optimisation.
  • Monthly Usage – Number of images optimised out of your monthly limit.
  • Total Count – Total number of images detected for optimisation.
  • Status – Current status of the optimisation process.

Once the optimisation process starts, you can pause or restart the process at any time if needed. This allows you to control the optimisation without losing the progress.

Note: Make sure to keep the browser window open while the optimisation process is running. Closing the window or navigating away from the page may stop the process before all images are optimised.

This is how easily you can bulk optimise images.

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 the bulk image optimisation process fails?

If the bulk image optimisation process fails, check the Image Queue section to see if there are any skipped images. The optimisation can be paused or restarted at any time, allowing you to control the process without losing progress. Ensure that your browser window remains open during the optimisation to prevent interruptions.

Can I optimise more than 500 images per month with the Nexter Extension?

With the free version of the Nexter Extension, you can optimise up to 500 images per month. However, if you upgrade to the Nexter Extension Pro, you can optimise unlimited images each month. This is particularly useful for sites with large media libraries that require regular optimisation.

What are the best settings for optimising images with the Nexter Extension?

The best settings for optimising images depend on your specific needs, such as the balance between image quality and file size. You can configure these settings in the Image Optimisation Settings section of the Nexter Extension. Adjusting these settings can help you achieve optimal performance without sacrificing image quality.

How does bulk optimisation improve website performance?

Bulk optimisation reduces the file sizes of images, which can significantly improve website performance by decreasing load times. Faster loading pages enhance user experience and can positively impact SEO rankings. Using the Nexter Extension allows you to optimise multiple images at once, streamlining the process.

What happens if I close my browser during the optimisation process?

If you close your browser window while the optimisation process is running, it may stop before all images are optimised. To ensure a smooth process, keep the browser window open until the optimisation is complete. Monitoring the live progress bar can help you track the optimisation status.

Is there a limit to how many images I can optimise at once?

While there is no specific limit mentioned for how many images can be optimised at once, the Nexter Extension allows you to process multiple images from your media library simultaneously. The actual number may depend on your server capabilities and the settings configured in the Nexter Image Optimisation Settings.

Last reviewed: April 14, 2026

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