With Xhtmlbatchvalidator you can check all the pages in your site in one batch.

If a document/URL can't be loaded at all a "Fatal Error" occurs and no further issues are displayed. Use the Error message and the link to the W3C Validator to see how you can fix this document.

If the document can be loaded but there are Errors found in it you can see the number of errors in the error column. Please hit the button to see the details. You may compare the results with the results of the W3C Validator. As the validation engine is not the same there may be differences in the results. A coorrect written/generated page should alwyas pass in both validators.