How to compare two pdf documents to find differences
- Step 1Upload the original PDF — Drop the first (original) version of the document into the diff tool.
- Step 2Upload the revised PDF — Drop the second (revised) version alongside.
- Step 3Run the comparison — The tool compares the text content and highlights differences.
- Step 4Review the diff report — Step through each change to accept, reject, or note for discussion.
Frequently asked questions
Does PDF diff work on scanned PDFs?+
Scanned PDFs need OCR to create a text layer before comparison. Run OCR on both versions first.
Can I export the diff report?+
Yes — download the diff result as a PDF with changes highlighted, or as a text report showing all additions and deletions.
Will formatting changes (bold, font size) be detected?+
Text content differences are detected. Formatting-only changes (bold, italic) without text changes may not be highlighted depending on the implementation.
Privacy first
All PDF processing runs locally in your browser using PDF-lib and pdf.js. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.