Compare PDF

The Compare PDF tool identifies and highlights visual differences between two PDF versions. Using the pdfjs-dist library to render pages and canvas-based pixel comparison, this tool creates side-by-side views of corresponding pages and highlights areas where the documents differ. This is essential for reviewing contract revisions, auditing document changes, comparing different versions of designs, and verifying that requested edits were correctly applied. The comparison is visual, meaning any change in appearance, whether text, images, or formatting, will be detected. All comparison processing happens locally in your browser for complete document privacy.

Comparing document versions is critical for legal, business, and quality control purposes. Use cases include reviewing contract changes before signing, auditing document modifications for compliance, comparing design revisions to verify changes, checking translation accuracy against originals, verifying that all comments were addressed in revisions, identifying unauthorized changes in documents, and quality control for document production. The tool is essential for lawyers, contract managers, designers, and anyone needing to verify document changes. The visual comparison makes it easy to spot even subtle differences that text comparison might miss.

To compare PDFs, upload the first PDF version by clicking upload or dragging it in. Upload the second PDF version for comparison. Wait for both documents to load and render. View side-by-side comparison with differences highlighted. Navigate through pages to review all changes. Use overlay mode if available for more precise change detection throughout both documents.