Upload two PDF files and compare them side by side. Scroll both panels together, flip pages, and spot differences visually — all in your browser.
PDF File A
Original / First version
Click or drag to upload
PDF File B
Updated / Second version
Click or drag to upload
Upload both PDF files to enable comparison
PDF A —
PDF B —
Works entirely in your browser. No uploads. No watermarks. No signup.
Need to check what changed between two versions of a contract, report, or document? Comparing PDFs manually — scrolling through both files side by side — is tedious and error-prone. This tool makes it instant.
QuickPDFonline's Compare PDF tool lets you upload two PDF files and view them side by side with synchronized scrolling. Toggle diff mode to highlight exactly where pixel-level changes occurred. Both PDFs are loaded and processed entirely in your browser — no file is ever sent to any server. Safe for confidential contracts, legal documents, and sensitive reports.
Perfect for lawyers reviewing contract revisions, students comparing assignment drafts, or professionals auditing document changes before signing.
ध्यान दें (Helpful Tip)
अगर आपके पास किसी document के दो versions हैं — जैसे पुराना contract और नया contract — तो दोनों PDFs यहाँ upload करें। Side by side देख सकते हैं कि क्या बदला है। "Highlight Differences" toggle करने पर changed areas red color में दिखेंगे। आपकी files कभी भी server पर नहीं जातीं — पूरी तरह private।
Upload your original or first version on the left panel.
Upload the updated or revised version on the right panel.
Click Compare — both documents render in sync with linked scrolling.
Toggle diff mode to see red pixel-level highlights on changed areas.
Side-by-Side Visual Comparison
Both PDFs render at the same zoom level — spot layout, text and image differences at a glance.
Synchronized Scrolling
Scroll either panel and both move together — no manual repositioning.
Pixel-Level Diff Highlighting
Changed areas appear in red overlay — precise visual diff at pixel level.
100% Private — No Server Upload
Both PDFs processed in your browser using PDF.js — never sent to any server.
This tool provides visual pixel-level comparison — not text-level diff. It shows you where on the page something changed (highlighted in red), but does not extract text to identify specific word changes.
The tool renders pages up to the maximum page count. For pages that exist in one PDF but not the other, the missing side shows a placeholder. The comparison summary also highlights the page count difference.
Never. Both PDFs are rendered entirely in your browser using PDF.js — a Mozilla open-source library. No files are sent to any server. You can safely compare confidential contracts, legal documents, and sensitive reports.
Need to compare your PDF files?