Compare PDF Files for Differences
Upload two versions of a contract, paper or bid — PDF, Word (.docx) or photos, mixed freely — and get every insertion, deletion and edit listed with page numbers and context. Export the result as a redline report you can 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 and scans all work, no parsing setup needed.
- 2
The comparison engine reads both versions and lists every change with its type, page number and surrounding context.
- 3
Review the differences, then export a redline report — as a self-contained HTML file, or as a Word document with real tracked changes.
Why OhMyOCR
Scanned documents compare too
A photographed or scanned contract is read first, then compared — you are not limited to files that still have selectable text.
Deterministic, not AI guesswork
Differences come from a deterministic comparison engine with a similarity score — every change is a concrete insertion, deletion or edit you can point to, never a model’s "looks fine to me."
Every change carries its page
Each difference is listed with page number, change type and the text around it, 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 you can open anywhere, 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
Asking a chatbot to compare two contracts produces prose: a confident summary of what it noticed, with no guarantee it noticed everything. Legal review needs the opposite — an exhaustive, mechanical list of every insertion, deletion and edit, because the change that matters most is precisely the one a summarizer skims past. A payment term moved from 30 days to 15 is two characters; missing it costs real money.
OhMyOCR runs a deterministic comparison engine over both documents and reports every difference 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
The output is built for the conversation that follows. Each difference is listed with 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 — that opens in any browser and prints to PDF cleanly.
Comparisons are flat-priced at 2 credits each regardless of length, and failed runs refund automatically. 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 engine compares 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 works fine.
Word's built-in compare only works when both files are Word files and both are digital. The gap this closes is the messy real-world case: the counterparty returns a signed scan, the archive copy is a photo, or the two versions live in different formats entirely.
Frequently asked questions
How do I compare two versions of a contract?
Open the Compare tab in the OhMyOCR workspace, upload the original and the revised file (or pick two documents you already processed), and start the comparison. Every insertion, deletion and edit 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. That matters when you need to defend the result — 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 — that opens in any browser and prints to PDF. Or a Word (.docx) report written with real tracked changes, so a reviewer can walk the list and accept or reject each one in Word.
What does it cost?
Each comparison costs 2 credits from your monthly pool, regardless of document length. Failed comparisons are refunded automatically.
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Try it on your own file
Free to start, no credit card, results you can verify line by line.
Get started — free