How to review contracts with AI

By the end of this guide you will have taken a contract from a raw PDF or Word file to a short list of key terms, flagged clauses and questions for the other side, with every point checked against the original text. The job is done by an AI document tool that reads the agreement, answers questions about it with references, and compares it with your standard terms or earlier drafts.

If you want to review contracts with AI, the real decision is what kind of review you need: a quick chat with a document, a legal-grade workspace, a contract management platform or a precise comparison of drafts. This guide covers six tools from our Automation and agents category and the steps that apply to all of them.

Key takeaways

• Upload the contract, ask for the key terms and risky clauses, then verify each point against the cited passage in the original document.
• The main decision is the kind of tool: chat with a document, a legal assistant, contract lifecycle software, a draft comparer, or a prompt library you run yourself.
• Plans differ sharply in price and limits, from free tiers with small upload caps to professional legal subscriptions, so check the cap before uploading a long agreement.
• AI review supports a lawyer; it does not replace one. Have a qualified person check anything with legal or financial consequences.

What you need before you start

• The contract file. A PDF, Word file or scan. Scans need OCR, which some tools offer.
• Your own rules. The terms you always require, such as payment terms, liability limits and renewal conditions, written as a short checklist.
• A tool account. Most tools here have a free plan, a trial or a demo.
• Permission to upload. Contracts often carry confidentiality clauses. Check you are allowed to put the document into a third-party service.
• Time. A first pass on one contract takes under an hour. Careful review of a long agreement takes longer.
• Difficulty. Easy for the chat tools, moderate for contract platforms, and harder for command-line options.

Which kind of AI tool fits this job

Choose by how often you review contracts and how much risk each one carries.

Chat with a document for occasional reviews. aiPDF lets you upload a PDF, ask questions and get answers matched to passages with references, so you can verify them. Its use cases list reviewing contracts for key clauses, and it handles scanned files through OCR. It runs in the browser with a free tier.

A legal assistant for lawyers. Paxton is an AI legal assistant for attorneys and legal teams. You work inside a matter, upload files, run clause lookup with source highlighting, and draft contracts and clauses. It also does US legal research. It is priced for professionals rather than casual use.

Contract lifecycle software for teams. fynk covers drafting from templates, negotiation through comments, approvals, e-signatures and a searchable repository. Its AI assistant summarizes and reviews documents against your rules, and a calendar tracks expiry and renewals. Meshly is aimed at finance and revenue teams: its Validate product extracts key terms such as net terms, contract length and billing cadence, then flags missing fields, mismatched dates and policy exceptions.

A draft comparer when the question is "what changed?" Syntheia builds Compare around the actual words in documents. It shows provision-level differences across two documents or many, and the company says Compare uses no generative AI.

A prompt library you run yourself. Fabric is an open-source framework of reusable prompts called Patterns, run from the command line. Its use cases include reviewing contracts for risky clauses. It suits technical users who are comfortable bringing their own model provider.

Step 1: Decide what the review must produce

Write down the output before you open any tool, so you can tell when the review is done.

1. Name the goal: summary of terms, risk flags, comparison with a standard, or redline suggestions.
2. List the clauses you care about, such as term and renewal, payment, liability, indemnity, termination, confidentiality and governing law.
3. Note who will sign off, and whether a lawyer must see the result.
4. Decide what counts as a deal-breaker so the AI's flags can be sorted quickly.

Check it worked by reading your checklist aloud: a colleague should know what a finished review looks like.

Step 2: Prepare the contract file

A clean file gives the AI better text to read.

1. Use the final or latest version, not a mix of drafts.
2. Export Word files to PDF if the tool only reads PDF, or keep the Word file if it works with Word.
3. For scanned pages, pick a tool with OCR, such as aiPDF or Paxton, and confirm the scan is legible.
4. Remove unrelated attachments, but keep schedules and exhibits that form part of the agreement.

Check it worked by opening the file and confirming every page, including signature pages and schedules, is present.

Step 3: Choose a tool and check its limits

Match the tool to the job and make sure the document fits within the plan.

1. For a one-off review, a free chat tool may be enough. aiPDF's free tier allows 2 PDF uploads and 35 MB per file.
2. For lawyers handling matters, look at Paxton, which accepts large files and states SOC 2, ISO 27001 and HIPAA compliance.
3. For a team that drafts, negotiates and signs contracts, look at fynk, whose AI assistant is available on every plan.
4. For comparing drafts, look at Syntheia.
5. Compare data handling. aiPDF says documents are stored encrypted and that data sent to the AI is excluded from external model training.

Check it worked by confirming the file size and page count are inside the plan's caps.

Step 4: Upload the contract and get a first summary

Start with a plain overview, so you can see whether the AI has read the document correctly.

1. Upload the contract, or add it to a matter or repository.
2. Ask for a summary of the parties, the term, the money, the renewal and termination rules, and any unusual obligations.
3. Ask for each point to include a reference to the clause number or passage.
4. Where the tool extracts terms automatically, such as Meshly Validate, check each extracted field against the contract.

Check it worked by finding two of the cited passages in the original and confirming they say what the summary says.

Step 5: Ask targeted questions about risky clauses

Work through your checklist one clause at a time, rather than asking for a general risk score.

1. Ask what the contract says about each topic on your list, and ask for the exact wording.
2. Ask what is missing, for example no cap on liability or no termination right.
3. Ask the tool to review against your rules. fynk describes review against your rules and playbooks, and Paxton can look up clauses with source highlighting.
4. Write down every point you plan to raise with the other side, with the clause reference.

Check it worked by confirming that every flagged item has a clause reference you can read yourself.

Step 6: Compare against your standard or the previous draft

Many problems show up as differences, not as single bad clauses.

1. Load your standard template or the previous round into the same tool.
2. Use a comparison tool such as Syntheia, which shows provision-level differences across two documents or many.
3. Look for changes you did not ask for, such as altered definitions, renumbered clauses or new carve-outs.
4. Add any new concerns to your list.

Check it worked by making sure every difference the tool shows can be found in both documents.

Step 7: Verify, escalate and record the result

The AI output is a working draft. A person decides.

1. Read the full text of every clause the AI flagged, and of every clause it did not mention that your checklist covers.
2. Send anything involving liability, intellectual property, employment or regulation to a qualified lawyer.
3. Record the decisions and open questions, and who made them.
4. Save the reviewed version and your notes with the contract, and set renewal or expiry dates in a calendar. fynk has a document calendar for this.

Check it worked by confirming that a person other than you can pick up your notes and understand the position.

Tools for this job compared

Tool	Good fit for	Pricing	Stated limits
aiPDF	Asking questions of a PDF in the browser, with references	Freemium, paid from $9/mo (checked 24 Oct 2026)	Free tier allows 2 PDF uploads and 35 MB per file; check answers against the cited references
Paxton	Attorneys drafting and analyzing in matters	Free trial, paid from $499/mo (checked 24 Oct 2026)	Web only; case law coverage is US appellate level and above; purchases are non-refundable
fynk	Teams managing the whole contract lifecycle	Freemium, paid from €19/mo (checked 24 Oct 2026)	Free is limited to 1 user and 50 AI credits a month; no view-only seat
Syntheia	Comparing drafts and tracking negotiation changes	Free trial, paid from $20/mo (checked 24 Oct 2026)	Prices published only for Super Comparer; some features listed as coming soon
Meshly	Finance teams extracting terms and checking policy	Free trial, paid from $299/mo (checked 24 Oct 2026)	Validate plans cap contracts per month; Intelligence Platform price depends on systems and volume
Fabric	Technical users running reusable prompts	Open source	You install and maintain it; model provider costs are separate

Prices and plan limits change, so confirm the current terms on each vendor's site before you subscribe.

Common mistakes to avoid

• Treating the summary as the contract. A summary can omit the exception that matters. Fix it by reading each flagged clause in the original, and by using tools that show references.
• Uploading a confidential agreement without checking. Many contracts restrict sharing. Fix it by reading the confidentiality clause and the vendor's data terms before upload.
• Ignoring caps on file size or count. A long agreement with schedules can exceed a free plan. Fix it by checking limits first, as in aiPDF's free-tier caps.
• Asking vague questions. "Is this contract safe?" invites a vague answer. Fix it by asking about specific clauses against your own checklist.
• Skipping legal review for high-stakes terms. Paxton's listing positions its output for attorneys, and aiPDF tells you to check answers against the cited references. Fix it by sending high-risk contracts to a qualified lawyer.

How we put this together

This is an evidence-based guide built from each tool's listing in our directory, which is compiled from the vendor's own site and pricing page. It is not a review based on using the tools. We don't rank tools, and nobody paid to be included. Some outbound links may be affiliate links; see our disclosure.

Frequently asked questions

Can AI review a contract accurately?

It can summarize terms and point to clauses quickly, but it can miss context or misread an exception. Use tools that cite the passage, verify each point in the original text, and have a lawyer check any contract with legal or financial risk.

Is there a free way to review a contract with AI?

Yes, within limits. aiPDF has a free Playful tier with 2 PDF uploads and 35 MB per file, fynk has a Free plan for one user with 50 AI credits a month, and Fabric is open source, though you pay your model provider. Paxton and Meshly list free trials rather than free plans, so check the vendor sites.

Can I keep a contract private when using AI?

Read each vendor's data terms first. aiPDF says documents are stored encrypted and that data sent to the AI is excluded from external model training. Paxton states SOC 2, ISO 27001 and HIPAA compliance. Fabric is software you run yourself, though the prompts still go to the model provider you connect.

How do I compare two versions of a contract?

Use a comparison tool built for it. Syntheia's Compare shows provision-level differences across drafts and says it uses no generative AI. Then read each changed clause yourself.

How long does AI contract review take?

The listings do not publish processing times. Your own verification of flagged clauses is the slowest part, and long agreements take longer.

Compare more options in our Automation and agents category.