Check a sentence for grammatical correctness at PaperRater.com, GingerSoftware.com, SpellChecker.net or GrammarCheck.net. In addition, LanguageTool.org offers online proofreading for more than 20 languages, including French, German and Polish.
These free online grammar checking websites work in similar ways, allowing users to paste text or compose directly in a text box and click a button to start the proofreading service. The programs underline problem sections, and clicking or mousing over those areas displays the specific errors. Of these sites, PaperRater.com is the only site to allow users to upload whole documents for checking. It also provides the most extensive feedback with the option of a printable summary report showing a detailed assessment of basic grammar, punctuation, word choice, style and vocabulary use.