What Is the Best Way to Change Format Type?

What is the best way to change format type, for example, .PDF to .jpeg?

I very much agree with Dave Salyer‘s point of view. Converting JPG to PDF via the built-in software- Preview (Mac) and Print Pictures (Windows）is the most secured and free way. Actually, there is also another quick and free way- using an online JPG to PDF converter. PDFfiller should be the leader in this field. Besides converting JPG, it allows you to convert BMP, TIFF, GIF, PNG, Excel, PPT, etc. to or from PDF as well. You can convert all the files that even are stored in your Dropbox or Google Drive. Step 1. Go to PDFfiller website and choose “JPG to PDF”. Step 2. Click “CHOOSE FILES” to add JPG files you want to convert. Step 3. Start create PDF file and download it. Of course, you can install a professional PDF converter like Cisdem PDF Converter OCR to convert PDF from or to 16+ formats including image (JPG, PNG, BMP, etc.) , Word, Pages, Text, Html, Excel, etc. without losing formatting and quality.