When you want to share a diagram with people who don’t have Visio, publish a diagram, or prevent reviewers from making changes, save it as an image file or in PDF format.
Save as a PDF file
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Select File > Export.
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Select Create PDF/XPS.
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Go to the folder where you want to save the file.
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Type a file name, and select Publish.
Select Open file after publishing to open the PDF file after you save it.
Save as an image file
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Select File > Export.
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Select Change File Type.
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Select a file type.
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Select Save As.
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Navigate to the folder where you want to save the file, type a file name, and select Save.
Source: Microsoft