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When uploading images to your website, it is important to use an optimized version so that you can save your server’s resources, and the loading speed for your website visitors will be faster as well.
One of the free tools I use is compressjpeg.com. It is a very clean tool and can help to compress your images (up to 20 images).

You can check out the before and after of the compression effect.
The following is the original image that I want to use in my website


Although the size has been cut by half, the quality is almost the same to naked eye.
So feel free to use compressjpeg.com to compress your images before you upload them to the web!
Hope you find this recommendation useful!