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DiffNow lets you compare text files, documents, binary files, and archives up to 2048KB in size. You can either upload the files you wish to compare or enter their URLs. Results are returned as an interactive HTML report.

Use to compare one file to another. Will show you a visual representation of the file and highlight the differences.

Quickly and Securely share documents online. Upload, Compare, Convert, Digitally Sign and View PDF, DOC, DOCX, PPT, PPTX, XLS and many other document formats.

Adobe software and services revolutionize how the world engages with ideas and information — anytime, anywhere, and through any medium. Learn more.

Infix PDF Editor lets you edit PDFs like a word processor, with features including spellcheck, translate, find & replace and filling in forms. Try for free or buy from €25+VAT

PDF Converter Elite is a software package that lets users convert their PDF documents into Word, Excel, PowerPoint and also create, manage and edit PDFs anytime.

Qtrac Ltd., home page, computer textbooks, free and open source software, C++, Go, Lout, Qt, Python, and PyQt, training and consultancy

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Premedia Systems, Inc. is an experienced San Francisco Bay Area consultancy specializing in publishing system automation and workflow analysis.

Diff Checker is a free online diff tool that gives you the text differences between two blocks of text.

Learn how to do just about everything at eHow. Expert Village is now a part of eHow, adding expert How To videos to eHow, the world

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