The public domain photographs available on these sites are completely free to use, however you want to use them.

A picture is worth a thousand words, or so they say. That means it's important to have some great images to support your site, whether you're a blogger, an online business or the owner of any other kind of website. It's also important to make sure you're not stealing those photos, so here we bring you a list of sites that offer completely free stock images that you can use legally, without breaking any copyright rules.

There are big-name stock photo libraries such as iStockPhoto and Stock.XCHNG, but most of the photographs here will need to be paid for, or will come with strict rules about how they can be used. The sites we've listed here offer completely free, no questions asked, no rules enforced photos for you to use however you want to, thanks to the CC0 license, which releases those photographs into the public domain.

Read on for the 13 best places to get free stock images for your website.