PDF Comparison That Actually Gets It Right

Other tools break when pages are added or removed. CatchDiff's smart page matching correctly pairs pages even when one document has insertions or deletions — showing you the real differences.

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The Problem With Other PDF Tools

When you insert a page, tools like Wondershare compare the wrong pages — every diff after that point is wrong.

Other Tools (Position-Based)

PDF-A: Page 1←→PDF-B: Page 1✓

PDF-A: Page 2←→PDF-B: [NEW]✗ WRONG

PDF-A: Page 3←→PDF-B: Page 2✗ WRONG

CatchDiff (Smart Matching)

PDF-A: Page 1←→PDF-B: Page 1✓ 97%

—←→PDF-B: Page 2 [NEW]INSERTED

PDF-A: Page 2←→PDF-B: Page 3✓ 99%

Everything You Need

Smart Page Matching

Correctly identifies inserted, deleted, and moved pages using cosine similarity — not just position. No more false diffs.

Character-Level Diffs

See exactly which words and sentences changed, with green highlighting for additions and red for removals.

Side-by-Side Viewer

Synchronized scrolling shows original and new version in two panels — one page at a time, no clutter.

Compare Your PDFs Now

Upload two PDFs and see the difference in seconds. No account needed.

Original Document

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Max 500 MB

New Version

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Max 500 MB

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CatchDiff extracts and compares text only. Changes inside images, scanned pages, or content requiring OCR will not be detected. Results are for reference only — always verify important changes manually. Terms