Solution for Forcing WordPress Image Uploads to be Cropped to 2560 Pixels

What to do if inserting an image with a resolution greater than 2560 pixels into WordPress automatically crops it into a 2560-pixel wide thumbnail? The method shared previouslyDisable WordPress 5.3 Automatic Thumbnail Cropping Featureseems ineffective for images of this size. Don't worry, the solution is here.

Why is the maximum image size only 2560 pixels?

The reason an uploaded high-definition large image is ultimately displayed as a 2560-pixel image is that after WordPress 5.3, WP officially introduced a new function for handling oversized images.big_image thresholdIf an image exceeds 2560px in pixels, it will automatically be proportionally scaled down to a 2560-pixel image, while the original image is still saved on the server, as shown in the figure below:If you want to find the original image, you just need to delete the '-scaled' suffix from the image filename to get the original.

Method to Solve Automatic Generation of 2560px Pixel Images

WP 5.3 controls whether to scale oversized images throughbig_image_size_thresholdthis function. We can disable this function. Add the following code to your website's Theme functions file. If you don't know how to add it, then use > Safe method to add code to the functions.php file: Code Snippets

//超过2560px的图片不剪裁
add_filter( 'big_image_size_threshold', '__return_false' );

Official explanation: https://make.wordpress.org/core/2019/10/09/introducing-handling-of-big-images-in-wordpress-5-3/ In addition to adding the code above to disable the 2560-pixel photo feature, the official recommendation is to use the following Plugin to disable it (to avoid the code becoming ineffective after Theme updates). Disable "BIG Image" ThresholdDownload Link

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