Document comparison
One clause changed.
Did anyone catch it?
Drop in two versions of a document. DiffDoc reads both, scores how far they've drifted, and marks up every insertion, deletion and edit — so you never re-read a whole contract hunting for the one line that moved.
- Works with .docx and .pdf
- A similarity score on every comparison
- Comment, edit, and export an audit-ready copy
No sign-up to try your first comparison.
Free · .docx or .pdf · up to 25 MB each · no sign-up to try
Built for the documents that come back marked up — contracts, leases, policies, specs, tenders.
How it works
Three steps, about a minute
Nothing to configure. Upload, and DiffDoc does the reading for you.
- 01
Drop in two versions
.docx or .pdf, up to 25 MB each. Your reference document, and the one you've been sent back.
- 02
DiffDoc reads both
It parses each file, scores how far the two have drifted apart, and locates every change.
- 03
You see what moved
Insertions, deletions and edits marked in place — word by word, not line by line.
Precise diff
Every insertion, deletion and edit — marked where it happened
DiffDoc lines the two documents up against each other and highlights exactly what moved. You read the changes, not the document.
- Word-level highlighting, not just line-level
- A similarity score tells you how far the versions drifted
- Risk flags surface the changes worth a second look
3.1 The term of this Agreement shall be
twelve (12) months twenty-four (24) months
commencing on the Effective Date.
5.2 Payment is due within
30 days 45 days of invoice.
+ New clause 8.4 — Confidentiality survives termination.
Review & export
Comment, edit, and hand it back
A comparison isn't the end of the job. Leave margin comments, make tracked edits on the primary, then export a clean marked-up copy for whoever needs to sign it.
- Comments and tracked edits on the primary document
- One-click .docx and .pdf exports
- Every comparison saved to your workspace
Pricing
Start free. Pay when you compare more.
Every plan gets the full diff, the similarity score, exports and edits. The only thing that changes is how many comparisons you run a month.
Free
Everything you need to try DiffDoc.
- Up to 5 comparisons per month
- Full marked-up diff & similarity score
- Download .docx & .pdf exports
- Comments & tracked edits
Pro
For steady, everyday reviewing.
- 50 comparisons per month
- Everything in Free
- Full comparison history
- Priority processing
Unlimited
For teams that compare all day.
- Unlimited comparisons
- Everything in Pro
- Bulk uploads
- Priority support
Prices in USD. Cancel any time. The free plan needs a Google sign-up and nothing else — no card.
Stop hunting for the change that matters.
Drop in two versions and DiffDoc will show you exactly what's different. Your first comparison is free, right now, without an account.
No card required · 5 free comparisons every month