Use the Thumbalizr API to submit URLs to automatically get a thumbnail image of that URL's web page contents. The thumbnails in JPG or PNG are sized according to the pixel size parameter (width) that you specify. You can also download a script to cache images locally with PHP. Also, specify the quality of the thumbnail to return, whether you want a screen or a page captured, and numerous other options. There are many options for API use: free option with no API key needed but limited features, free API key option for more features, API key paid for even more features, and API key paid with the most features.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.