Google's Deep Review is a free second reader for your long documents, minus the red pen and the sighing
By Brett Gavaghan, Founder of Adaptd ·
Google Research has opened Deep Review to everyone. It uses AI agents to check a long document's reasoning and evidence, and each user gets two free reviews a week.
The short version
- Deep Review is a Google Research tool that uses AI agents to check long documents for errors in reasoning, facts and evidence.
- It opened worldwide on 14 October 2026, with two free reviews per user each week, for PDFs and plain text files.
- Use it as a second reader on reports, proposals or contracts, and keep a person responsible for the final call.
AI has made long documents quick to write. Checking them is still slow, and the job usually lands on whoever looks least busy on a Friday afternoon.
What is Google Deep Review?
Google Deep Review is an AI tool from Google Research that reads a long document and flags problems with its reasoning and evidence. It grew out of a tool for checking computer science papers before conference submission, and has already checked more than 16,000 conference submissions.
Google says it now covers design documents, presentations, and legal and financial documents as well. Google calls it an agentic system, meaning AI agents work through the document in several steps.
Who can use it, and what does it cost?
Deep Review is free for anyone at research.google/deepreview, with two reviews per user each week. Google says it's available worldwide, so Australian businesses can use it now.
It accepts PDFs and plain text, and checking several related files together is listed as coming soon. Heavier users can connect a Gemini API key for higher limits. Google says uploaded documents are never used to train its models, and are kept for one year so you can come back to your reviews.
Should your business use Deep Review?
Your business should try Deep Review on a long document where a mistake would cost money, such as a tender response, a board report or a big proposal. Two free checks a week is plenty for most small teams.
My take: treat it as a second reader, not a sign-off. Google says the tool leaves the bigger judgement calls to people, and an AI checker can be confidently wrong too. Think twice before uploading anything confidential, and check what your client agreements say about outside tools.
It still won't tell you the proposal is three pages too long. Some jobs need a human.
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