By default, WordPress compresses your images for better performance. Below we will see how you can increase or decrease it compression of .jpeg images in WordPress.
Every time you upload one picture jpeg in WordPress, the software will compress it to 90% quality. As of WordPress 4.5, this number has dropped to 82% to improve the site's performance for mobile users.
Now if you are a photographer and want to display high quality images on your website then you can disable its compression image in WordPress.
Let's see how:
All you need to do is copy and paste the below code in the functions.php file. The file is in the theme you are using.
add_filter ('jpeg_quality', function ($ arg) {return 100?});
By setting the price to 100, you are sure that WordPress will compress the image to its highest quality.
If you are not a photographer, you probably will not see a big difference in quality. But for those who work with high-quality images on a daily basis, the difference in quality is obvious.
But let's see what we can do for those who are not photographers and are more interested in the performance of their website:
If you want, you can further reduce the number to earn a few kbs of each image you upload to your site.
Copy and paste the following code into the functions.php file:
add_filter ( 'jpeg_quality', function ($ arg) {return 75;});
After these changes in image quality, you will need to run the plugin Regenerate Thumbnails.