Free Private PDF & DOCX Compare

Document Diff Tool

Upload two PDF or Word (DOCX) files and compare their text content. Contrast extracts text using pdf.js and mammoth.js, then diffs it line by line. All processing happens in your browser — no files are uploaded.

Document A (Original)Click to upload a PDF or DOCX file

Document B (Changed)Click to upload a PDF or DOCX file

How PDF Diff Works

Upload two PDF files and Contrast extracts the text content using pdf.js, then compares them line by line. Ideal for reviewing policy revisions, contract changes, and document updates. All processing is 100% local — your PDFs never leave your device.