PDiff vs Redline Compare

PDiff is desktop software for comparing PDF documents and identifying differences in layout, formatting and page breaks. It displays PDFs side by side, synchronizes extracted text with the pages and highlights deviations in both views. Reviewers can navigate differences, mark changes accepted, hide less relevant changes and add comments. Filtering and review tools include exclusion areas, page ranges, text-flow and table tools, replacement rules, comments and OK checkmarks.

PDiff can compare PDFs with DOC/DOCX, RTF, TXT, XLS and other common formats, converting non-PDF files through their native applications. Outputs include tabular, annotated and side-by-side PDFs, XML, CSV, PDiff project files and CLI return codes. PDiff Professional adds GUI batch processing and command-line operation. CSci Computer Science GmbH describes uses including quality assurance, regulatory compliance, contract and legal review, pharmaceutical packaging and technical documents. The software supports Unicode, including Chinese, Japanese, Korean, Arabic and Hebrew. The maker says processing is local and documents are not transferred over the internet. Business customers can request a free full-functionality trial; pricing for editions is on request.

Redline Compare is a web service for comparing original and edited documents for legal teams. Upload both versions and receive a redlined document that highlights their changes; the site says results are returned in seconds. It supports PDF and DOCX comparison and lists all file formats in both plans. Documents are processed with enterprise-grade encryption, according to the site. The product focuses only on redlining. It does not include document storage, user-management systems, or collaboration tools. The Free plan costs nothing and provides 50 document comparisons. Pro costs $4.99/month and adds unlimited redlines and priority processing. Both plans list professional accuracy and all file formats. Redline Compare describes its pricing as having no hidden charges, with payment directed only to redlining. It runs in a web browser, with PDF comparison, office-file comparison, and redline output provided through the web deployment.