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Can BuildVu convert files in memory?

Yes. The PDF to SVG and PDF to HTML converters can both accept a PDF file as a byte[] when running from Java.

//SVG
PDFtoSVGConverter converter = new PDFtoSVGConverter(pdfFileAsByte, outputDir, conversionOptions, viewerOptions);

//HTML
PDFtoHTML5Converter converter = new PDFtoHTML5Converter(pdfFileAsByte, outputDir, conversionOptions, viewerOptions);

Output can then be configured to stream to memory.