There are multiple high-quality free grammar checker websites and programs. Grammarly is a free program that allows users to copy or upload their documents, and these documents are checked for spelling, grammar and punctuation.
Grammarly also offers a free browser extension that scans anywhere that users write online. Other websites that offer free spelling and grammar checkers include SpellCheckPlus.com, Reverso.net, SpellCheckPlus.com, PaperRater.com and SpellChecker.net. These websites allow users to upload or copy and paste documents, and they are scanned for proper spelling and grammar. All of these websites offer free grammar and spelling tools, but some of them have additional programs available for a fee.