A great grammar checking tool will catch a variety of common errors such as basic typos, incorrect spacing, and other grammar glitches. Most of them do an excellent job of identifying common punctuation problems. Only the best tools are also able to identify more complex grammar problems such as comma splices, missing Oxford commas, and inconsistencies with the use of quotation marks.
Considering you are reading your own documents may spoil your ability to see an error. Quetext Grammar Checker provides a single tool to fix all your grammar issues along with clarity and spelling errors. For a closer look at how grammar and punctuation tools sharpen academic writing specifically: How to check your grammar and punctuation in essays.