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PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.
browserling - Live interactive cross-browser testing from your browser.
DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
GeoPeeker - GeoPeeker is a tool for viewing sites from different geographic solutions.