This is not a good idea if I understand you correctly.
HTML files are static - only processing on the client machine through javascript is allowed.
ASPX files are dynamic, processing is performed on the server each time the page loads or interacts with the user, and this generates HTML, which is transmitted to the client browser.
If you convert ASPX to HTML, you will lose all dynamic page elements. Try it: load the ASPX page in the browser and right-click. Select "View Page Source" (or as its browser calls it) and save it to your local hard drive. You can download it and it will look like your page, but nothing will actually work.
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