Grammar Checkers

PaperRater is a FREE resource, developed and maintained by linguistics professionals and graduate students. It analyzes documents immediately, 24/7, in real-time. We provide in depth analysis to help the student improve grammar and writing. Some of our features include:
  • Plagiarism Detection
  • Auto Grader
  • Spelling and Grammar Check
  • Style and Word Choice Analysis
  • Readability Statistics
  • Title Validation
  • Vocabulary Builder tool

Spell Check Plus
The free version (w/ ads) of the site allows user to submit texts up to 500 words. They recommend you split your document up into batches of 5 or 6 pages and submit them separately if you don't want to pay for the PRO version ($15). They also sell a mobile iphone App for $5.99

After The Deadline
Grammar, usage, and style checker inspired by The Times's style manual.
In addition to the online version, After the Deadline is available as:

Free Online Grammar Checker (w/ads)
A web application that allows you to check your grammar, spelling, and writing style for free!

An automated proofreader and your personal grammar coach. Check your writing for grammar, punctuation, style and much more. This is the free online version ( They also have a 7-day trial and paid versions.