This batch W3C validator tool is perfect to find out HTML errors on websites and check the markup validity of URLs in HTML, XHTML or HTML5. Using a HTML validator tool like this one can save you time and money and help you to see what URLs are in need of change and which are valid. Search up an unlimited number of different URLs or files quickly so you can see which need to be fixed and impove your SEO. A report file for later use can be saved. The errors are being highlighted and listed in an editor for your convenience and in order to save time making the required changes. The checks are being made using the original W3C validator program but locally, without using the W3C website. You can import a list of URLs or files to check from a Text file, an Excel file, a CSV file, a XML sitemap file or simply enter them in a textbox. The application is also multilingual and translated into 39 different languages.