Document comparison, done right
See exactly what changed.
Upload two versions of a document. DiffDoc reads both, measures their similarity, and marks up precisely what was inserted, deleted and edited.
- Works with .docx and .pdf
- Similarity score on every comparison
- Download marked-up exports, add comments & edits
No sign-up to try your first comparison.
Free · .docx or .pdf · up to 25 MB each · no sign-up to try
Three steps, about a minute
No settings to configure. Upload, and DiffDoc does the reading for you.
Upload two versions
.docx or .pdf, up to 25 MB each. Drop in your reference and the document to compare.
DiffDoc reads & scores
It parses both documents, measures how similar they are, and locates every change.
See exactly what changed
A clean, marked-up view of insertions, deletions and edits — line by line.
Precise diff
Every insertion, deletion and edit — marked in place
DiffDoc aligns the two documents and highlights exactly what moved, so you never re-read a whole contract to find the one clause that changed.
- Word-level highlighting, not just line-level
- 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 off
Turn a comparison into a working document: leave margin comments, make tracked edits on the primary, then export a clean marked-up .docx or .pdf.
- Comments and tracked edits on the primary document
- One-click .docx and .pdf exports
- Every comparison saved to your workspace
Pricing
Start free. Upgrade when you compare more.
Every plan includes the full diff, similarity scoring, exports and edits. The only difference is how many comparisons you run each 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 anytime. Free plan requires only a Google sign-up — no card.
Stop hunting for the change that matters.
Drop in two versions and let DiffDoc show you exactly what's different — your first comparison is free, right now.
No card required · 5 free comparisons every month.