WordPress error: Post-processing of the image failed likely because the server is busy

The maximum image size limit of 2560 pixels on the longest side was introduced in WordPress 5.3, which was released on November 12, 2019. This change was made to prevent large image files from slowing down the website’s performance and taking up too much storage space on the server. However, it is possible to increase the maximum image size limit by modifying the WordPress settings or the server configuration. This can be done by editing the “functions.php” file in your WordPress theme or alternatively, you can also install a plugin to increase the maximum upload size for images. It’s important to keep in mind that uploading large images can slow down your website’s load times, so it’s a good idea to optimize your images for the web by reducing their file size without compromising on quality. There are several plugins available that can help you with image optimization and compression, such as WP Smush or EWWW Image Optimizer.

How to disable the image size limit of 2560 pixels in WordPress?

The server cannot process the image. This can happen if the server is busy or does not have enough resources to complete the task. Uploading a smaller image may help. Suggested maximum size is 2560 pixels.

  • Suggested solution: Locate the “functions.php” file in your current WordPress theme directory and download a backup copy of it to your local computer. Open the “functions.php” file in a text editor and add the following code at the end of the file:
function disable_image_size_limit( $size_limit ) {
return false;
add_filter( 'big_image_size_threshold', 'disable_image_size_limit' );
  • Alternative solution: as simple as installing the plugin Disable “BIG Image” Threshold. For some people, this plugin may be more convenient that the abobe fix.

Why is it a good idea to reduce image size?

  • Faster loading times: Large images can take a long time to load, especially on slower internet connections or mobile devices. This can lead to a poor user experience and may cause visitors to leave the website before the page has fully loaded. By reducing the size of images, you can improve the website’s loading times, which can lead to better user engagement and retention.
  • Improved website performance: Large images can also put a strain on server resources and increase the website’s load times. This can lead to slower website performance, which can impact SEO rankings and user experience. By optimizing and reducing the size of images, you can help to improve website performance and reduce the strain on server resources.
  • Reduced bandwidth usage: Large images can consume a lot of bandwidth, especially if they are being viewed on multiple devices or by many visitors. This can result in higher hosting costs and slower website speeds. By reducing the size of images, you can reduce the amount of bandwidth required to load the website, which can help to lower hosting costs and improve website speeds.
  • Better SEO rankings: Search engines consider website speed as a ranking factor, and faster loading times can help to improve SEO rankings. By reducing the size of images and optimizing website performance, you can help to improve the website’s SEO rankings and increase visibility in search engine results pages.

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