An image that has been blurred on a website is blurred one of two ways ...
If the reason an online image is blurry on a website is because the image itself has been edited with an image editing program like Photoshop, there is really nothing you can do because each of the pixels that make up the image is set within the image. There may be some online tools that can unblur the image a tiny bit but chances are you will not be satisfied with the results and the image won't unblur very much.
If the reason an online image is blurry on a website is because of CSS code, unblurring that photo is extremely easy to do. An image that is blurred with css code has certain attributes assigned to the image by the web page. View the image alone, separate from the web page, and the css code is not applied to the image that is blurred.
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.Here is an image that has been blurred with Photoshop. An image that is blurred this way can't really be unblurred.
Here is an image that has been blurred with css code. This image definitely can be unblurred using the instructions above for clearing a blurred image online.
A slightly easier way to unblur any image is this free app that works in all web browsers, including cell phone web browsers. The benefit to this image unblurring app is that you can unblur ALL images on a web page with a single mouse click. Again, this will only work if the reason for the image blurring is css code.
As an interesting side note, this app removes all css code from a web page so clicking the bookmarklet/app for unblurring an image online will cause the structure of the entire web page to fall apart and will also reveal other things on the web page the website owner would prefer remain hidden from its visitors.
This link is the image unblurring app for web browsers. To install and immediately start using this image unblurring app:
Try the bookmarklet on this page and you will see which images are blurred using css code and which images have been blurred with an image editing program prior to being uploaded to the web server.