A PDF diff checker shows exactly what changed between two document versions — every edited word, moved paragraph, and modified number.
Navigate to the PDF diff tool.
Upload the original document as File A and the revised version as File B. Click Compare. The tool renders both PDFs and generates a pixel-accurate diff.
Diff view: every changed pixel highlighted in red — the most precise view. Side-by-Side view: read both versions in parallel with synchronized page navigation. Overlay view: superimpose both versions to see misalignments.
Tip: For text-heavy documents (contracts, reports), the Diff view highlights changed words clearly. For layout-heavy documents (design proofs, brochures), use Overlay view.
PDF diff is visual (pixel-based), not text-based. It compares the rendered visual appearance of pages. For text-only diff, export both PDFs to TXT first then use a text diff tool.
Yes — completely free at pdfeditor.onl/compare-pdf.