PDF Diff
Compare two PDFs side by side with visual and line-by-line text diff highlighting — free and private. Spot every change instantly without uploading files to any server.
Original PDF (Older Version)
Modified PDF (Newer Version)
100% Private Comparison
Both PDFs are processed entirely in your browser. No files are uploaded to any server. Perfect for comparing sensitive legal or business documents.
Visual + Text Diff
See side-by-side page renders for visual comparison, plus a line-by-line text diff highlighting exactly what changed between versions. Ideal for contract review and version tracking.
Tips for best results
- Text-based PDFs work best. Scanned PDFs (images) may not have extractable text for the diff view.
- Visual comparison shows the actual rendered pages side by side — useful for catching layout changes even if text is identical.
- The diff algorithm matches lines by content, so reordered paragraphs will show as additions and removals.
Frequently Asked Questions
Upload both PDFs to Toolsz PDF Diff, and the tool shows them side by side with visual and line-by-line text diff highlighting. Every change is marked in color — additions, deletions, and modifications. Free, no signup, 100% client-side.
Toolsz is one of the only free PDF comparison tools available. Most PDF diff tools are paid features of professional software. Toolsz does both visual page comparison and text diff highlighting — completely free, no signup, and your files never leave your browser.
Yes — Toolsz PDF Diff processes both documents entirely in your browser. Your sensitive contracts and legal documents never leave your device. This is critical for compliance and confidentiality, unlike server-based comparison tools.