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How to Fix Post-Processing of Image Failed Error in WordPress

Is your WordPress displaying the ‘Post-Processing of Image Failed’ error?

This problem commonly happens when you use the built-in media uploader to upload an image file to WordPress.

This post will demonstrate how to simply resolve the ‘Post-Processing of Image Failed’ upload problem in WordPress.

What Causes the ‘Post-Processing of Image Failed’ Error?

Several things happen when you add an image to a post or the media library on your WordPress website. The image file is uploaded to your WordPress hosting server, an attachment page is generated for the picture, and some post-processing is performed via a PHP image editing module.

Unfortunately, you may get the following WordPress error notice during the picture upload process:

‘Image post-processing most likely failed because the server is overloaded or does not have adequate resources. Uploading a smaller picture may be beneficial. The recommended maximum size is 2500 pixels.’

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Fortunately, this WordPress error notice is fairly detailed. It informs you that the issue occurred during post-processing the picture in WordPress and recommends that your web server may be down.

The error notice also provides a workaround. It suggests that you submit a smaller image with the longest dimension of no more than 2500 pixels.

With that stated, let’s look at how to resolve the ‘Post-Processing of Image Failed’ problem in WordPress.

1. Make Sure The HTTP Error is Not Temporary

To begin, ensure that there are no special characters in the file name, such as an apostrophe. If this is the case, you should rename the picture file.

After that, wait a few minutes before attempting to upload your image file again. If your server was merely busy, as the notification implies, it might have been due to exceptional traffic or a lack of server resources.

On most WordPress hosting servers, issues like this are immediately resolved.

If you’re still having picture upload problems after a while, try uploading a different file. You might also try clearing the cache in your browser or using a different web browser.

If the ‘Post-Processing of Image Failed’ error persists after doing these procedures, the problem is not a momentary malfunction, and you should continue debugging.

2. Increase WordPress Memory Limit

The error message implies that your server may be lacking in resources. Let’s boost the amount of RAM accessible to WordPress.

You will need to raise PHP’s RAM limit on your server. You can do this by adding the following code to your wp-config.php file.

define( ‘WP_MEMORY_LIMIT’, ‘256M’ );

This code raises the WordPress memory limit to 256MB, which should be sufficient to resolve any memory limit concerns.

You should also check to see whether the file is greater than the upload limit on your website. See our tutorial on how to raise the maximum file upload size in WordPress for more information.

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If your WordPress hosting provider does not enable you to increase the RAM limit, you may need to migrate to a managed WordPress hosting service such as SiteGround or WP Engine.

3. Optimize the Image to Make It Smaller

According to the problem notice, submitting a smaller picture may assist. It advises that your image’s longest edge has no more than 2500 pixels.

Many novice bloggers just upload photographs without optimizing them for the web when they first start a blog. Not only might this result in an error notice like this one, but huge picture files will also slow down your website.

Read More: How to Add a Reading Progress Bar in WordPress Posts

A sluggish website will lower your overall SEO ranks.

To optimize the image, use image-editing software to save it in the appropriate file format (such as JPEG, PNG, or GIF), scale the image dimensions to a lower size, and compress the image to reduce the file size even further.

It’s worth noting that this error message might appear even when uploading smaller photos. If the issue persists even after uploading optimized photos, proceed to the next stage of troubleshooting.

4. Change Image Editor Library Used by WordPress

WordPress uses two PHP modules to post-process images: ImageMagick and GD Library. Depending on which is accessible, WordPress may utilize any of them.

ImageMagick, on the other hand, might have memory difficulties, which can result in mistakes during picture uploads. You may remedy this by making the GD Library your default image editor.

Simply add this code to your theme’s functions.php file or a site-specific plugin to do this.

function wpb_image_editor_default_to_gd( $editors )
$gd_editor=”WP_Image_Editor_GD”;
$editors = array_diff( $editors, array( $gd_editor ) );
array_unshift( $editors, $gd_editor );
return $editors;

add_filter( ‘wp_image_editors’, ‘wpb_image_editor_default_to_gd’ );

You should try uploading the image again after adding this code.

We hope this guide was useful in teaching you how to resolve the ‘Post-Processing of Image Failed’ problem in WordPress. You may also be interested in our guide on how to start a podcast in WordPress and our comprehensive lesson on how to effortlessly construct a staging site in WordPress.

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