Does Grammarly train AI on your data?
Yes, unless you opt out
“You can opt out of allowing Grammarly to use your content to train its models and improve its product for everyone. To do so, turn off Product Improvement and Training in your account settings.”
From Grammarly's privacy policy , checked Oct 28, 2026. In Grammar & Proofreading, 3 of 4 tools whose policies answer this say they don't train on customer content.
The rest of the data policy
Data retention
Saved documents kept until you delete them or your account
“if you save a document in the Grammarly Editor, we’ll store it until you delete the document or your Grammarly account.”
Where data is stored
Not stated
Security and compliance
Similar tools that say they don't train on your data
Hemingway Editor“We and our AI providers do not use this content to train, fine-tune, or improve AI models.”
LanguageTool“Learneo does not use inputs from any LanguageTool user (Individual or Team Plan) to train its language algorithms or models. This is a default setting in LanguageTool that does not require an opt-out or any action by the user.”
ProWritingAid“When using ProWritingAid, your texts will not be used to improve the quality of our services.”
Grammarly and your data: common questions
Does Grammarly use my data to train AI?
Yes, unless you opt out. Grammarly's policy says: "You can opt out of allowing Grammarly to use your content to train its models and improve its product for everyone. To do so, turn off Product Improvement and Training in your account settings." (checked Oct 28, 2026).
Can I stop Grammarly from training on my content?
The policy describes a way to opt out; the wording above says where. Plans for businesses often have different defaults, so check the terms of the plan you're on.
How long does Grammarly keep my data?
Saved documents kept until you delete them or your account. The policy says: "if you save a document in the Grammarly Editor, we’ll store it until you delete the document or your Grammarly account."
What security certifications does Grammarly have?
Its security pages list SOC 2 Type II.
Which grammar & proofreading tools don't train on your data?
Among the closest alternatives, Hemingway Editor, LanguageTool, ProWritingAid say in their policies that they don't use customer content for training.
Business plans often carry different terms than free and individual plans. We record what the public policy says; the quote shows which plan it covers. See Grammarly's full profile or how other AI tools compare.