Recently, after upgrading to WordPress 5.3, many people's websites have encountered issues, such as
article publishing failure, images prompting post-processing failure,
image file size cannot exceed 2560 pixels, etc.This article by Naiba introduces
how to solve the problem of WordPress 5.3 image upload post-processing failure by reducing images to 2500 pixels and re-uploading. 
Error Message
If you upgraded to WordPress 5.3 and see the following two prompts, then the method in this article can help you solve it. The Chinese prompt is:
Image post-processing failed. If this is a photo or a large image, please reduce it to 2500 pixels and re-upload.The English prompt is:
Post-processing of the image failed. If this is a photo or a large image, please scale it down to 2500 pixels and upload it again.Solution
Method 1: Clear Website CacheIf you have installed caching plugins, such as
wp rocket, WP SUPER CACHE, W3 Total Cache, etc., clear the cache. If you also have caching like Memcached or Redis, clear those as well. Then test again.
Method 2: Upload Images via Media LibraryThis method is only a workaround for uploading and does not actually solve the problem. First, upload the image via the backend Media Library, then insert the image into the post.
Method 3: Disable the 2560px Image Cropping FeatureYou can install the Disable „BIG Image” Threshold plugin or insert the following code into the theme“s functions file.
//超过2560px的图片不剪裁
add_filter( 'big_image_size_threshold', '__return_false' );
For detailed methods, please refer to:
Solution for WordPress Forced Image Cropping to 2560 Pixels Method 4: Downgrade to an Older Version of WordPressMany believe it is a compatibility issue between WordPress 5.3 and some server components, which can be resolved by downgrading to an older version. If you wish to downgrade, you can use the following method:
Other potentially useful methods (untested):1. Enable the mbstring extension for PHP. For cPanel shared hosting, enter the cPanel panel, find the PHP version in the software section, and check mbstring. 2. For nginx, try increasing the value of the client_max_body_size attribute. 3. For Apache, try modifying the MaxRequestLen parameter in /etc/apache2/mods-enabled/fcgid.conf.
<IfModule mod_fcgid.c>
AddHandler fcgid-script .fcgi
FcgidConnectTimeout 20
MaxRequestLen 10485760
</ IfModule>
4. Use a third-party image storage service. 5. Upgrade the server. Some people's servers experience CPU spikes to 100% when uploading images (if you are using
Baota Panel, you can see this from the Baota Panel backend).
Other Related Articles
Method 2: Upload Images via Media LibraryThis method is only a workaround for uploading and does not actually solve the problem. First, upload the image via the backend Media Library, then insert the image into the post.Method 3: Disable the 2560px Image Cropping FeatureYou can install the Disable „BIG Image” Threshold plugin or insert the following code into the theme“s functions file.
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