Compare two PDFs without uploading them.
See exactly what changed between two versions of a document: additions, deletions, moved text. Both PDFs stay on your device throughout.
Two versions of a contract are twice the sensitive content.
Document comparison is a review task, which means both versions are almost certainly sensitive. Uploading a contract, a brief, or a policy to a third-party compare service means sending both the old version and the new one to a server you don't control.
Comparing two versions of a confidential document shouldn't require uploading both of them to someone else's server.
KeptPDF extracts and diffs the text content of both PDFs entirely in your browser. No upload endpoint, no server processing. Both files stay local. You can check the Network tab while comparing: neither file ever appears in a request.
How to compare two PDFs
On your device. No account needed, and nothing gets uploaded.
1. Open both PDFs
Drop in the original and the revised version. Both load in your browser. Neither is uploaded.
2. View changes
KeptPDF highlights additions in green and deletions in red, with a side-by-side view showing the differences across every page.
3. Review and save
Step through every change, or download the redline comparison as a PDF.
Exact changes. Both files stay local.
Word-level diff
Changes are highlighted at the word level, not just the paragraph. Additions appear in green, deletions in red, making it easy to spot even a single modified word in a long contract.
Side-by-side view
The original and revised versions appear side by side with synchronized scrolling so you can see context alongside the highlighted changes.
No upload
Both documents are compared in your browser. Neither file is transmitted to any server at any point.
Free, no account
Compare PDFs free with no sign-up, no daily limit. Pro ($29/month) supports larger files (hundreds of MB practical limit, browser memory dependent).
After reviewing the changes
Two sides of the same job, both running entirely on your device.