Although there are a few websites out there that offer free proofreading, they are not always reliable. Many websites make promises they cannot keep, and they may not provide the quality of service that you need.
That being said, there is an easy, free way to get your paper proofread. All you need to do is enlist the help of a friend. Ask someone who is knowledgeable and trustworthy to look over your paper before you submit it. Chances are they are more than willing to help.
When you have a friend review your paper it can be really helpful. They may be able to spot errors that you hadn't noticed, giving you the opportunity to fix them before it's too late. Additionally, this person can also provide you with honest feedback about the strength of your writing and help identify any areas that may need some extra attention.
Although it's not always the most convenient option, having someone review your paper is the best way to get it proofread for free. If you have even the slightest suspicion that your paper needs an extra set of eyes, don't hesitate to ask for help.
