Compare PDF Files for Differences
Compare PDF files and see exactly what changed: upload the original and the revised version, and every difference is listed with its page and the text around it — scans and photos included. Export the list as a redline report to print or share.
Service Agreement Draft
Payment due within 45 days of invoice.
The total contract value is USD 8,000.
Either party may terminate this agreement with thirty days written notice.
All amounts are stated in USD unless otherwise agreed in writing.
Signed by both parties on July 2026.
Service Agreement Draft
Payment due within 30 days of invoice.
The total contract value is USD 5,000.
Either party may terminate this agreement with thirty days written notice.
All amounts are stated in USD unless otherwise agreed in writing.
Signed by both parties on July 2026.
45
30
8
5
How it works
- 1
Upload the original and the revised file — PDFs, Word documents, scans and photos all work.
- 2
Both versions are read — scans go through OCR first — and every change is listed with its type, page number and surrounding text.
- 3
Review the list, then export a redline report: a self-contained HTML file, or a Word document with real tracked changes.
Why OhMyOCR
Scanned documents compare too
A scanned or photographed contract is read first, then compared — so a signed paper copy can be checked against the digital draft.
Deterministic, not AI guesswork
Differences come from a deterministic comparison with a similarity score — every change is a concrete insertion, deletion or edit you can point to, never a summarized "looks fine to me."
Every change carries its page
Each difference lists its page number, change type and the surrounding text, so you can jump straight to the clause that moved.
Redline report export — HTML or Word
One click exports a clean self-contained HTML report that opens anywhere and prints to PDF, or a Word (.docx) version with real tracked changes your reviewer can accept or reject one by one.
Why "read both and tell me what changed" is the wrong tool for contracts
You ask a chatbot to compare two contracts and get back a confident summary of what it noticed — with no way to know what it skipped. Legal review needs the opposite: an exhaustive, mechanical list of every change, because the one that matters most is precisely the one a summary glides over. A payment term that moved from 30 days to 15 is two characters; missing it costs real money.
The comparison is mechanical and complete: every difference is reported with its type, page number and surrounding context, plus a similarity score for the whole document. Scanned versions are read by OCR first, so a signed paper copy can be checked against the digital draft it was supposedly printed from. Nothing is summarized away — the count of differences is the count of differences.
From two files to a redline you can hand to the other side
You will be handing this list to the other side, so it needs to read well there too. Each difference shows the base text struck through and the revised text beside it, page-anchored so either party can open their copy to the same clause. One click exports the whole list as a self-contained redline report — deletions in red strikethrough, insertions underlined — which opens in any browser and prints cleanly to PDF.
Comparisons are billed at 2 credits per page across both documents (4-credit minimum), and failed runs refund automatically. Use it to version-check a bid before submission, verify a counterparty’s "minor edits," or confirm that the signed scan matches the negotiated draft — the workflow is the same three steps.
Not just contracts — any two PDFs or Word documents
The same comparison works on any pair of documents: two quotes from a vendor, two drafts of a thesis chapter, a spec before and after review, a Word file against the PDF it became. PDF, Word (.docx) and photos can be mixed freely — one side digital, the other a scan.
Word's built-in compare requires both files to be Word files and both digital. The gap here is the messy real-world case: the counterparty returns a signed scan, the archive copy is a photo, or the two versions exist in different formats entirely.
Frequently asked questions
How do I compare two versions of a contract?
Open the Compare tab in the workspace, upload the original and the revised file (or pick two documents you already processed), and start. Every change appears with its page and context, and you can export the whole thing as a redline report.
Can it compare scanned documents or photos?
Yes. Scanned PDFs and photographed pages are read by OCR first, then compared — so a signed paper copy can be checked against the digital draft.
Is the comparison AI-generated?
No. The difference list comes from a deterministic text-comparison engine, with a similarity percentage for the whole document. When you need to defend the result, that matters: there is nothing probabilistic about "clause 4.2 changed."
What does the redline report look like?
Two formats. A single self-contained HTML file — deletions struck through in red, insertions underlined in green, each change numbered with its page — opens in any browser and prints to PDF. Or a Word (.docx) report with real tracked changes, so a reviewer can walk the list and accept or reject each one in Word.
What does it cost?
Comparisons are billed at 2 credits per page, counting the pages of both documents, with a 4-credit minimum. Failed comparisons refund automatically.
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Try it on your own file
Free to start, no credit card, results you can verify line by line.
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