When I post HTML to a blog, I find that smart quotes don't show up correctly, so this tool replaces smart quotes (and a few other entities) with regular quotes (or the regular entity). To use, paste text containing smart quotes in the top box, then hit convert and the converted text will appear in the lower text box.

Example text with smart quotes: ‘Single smart quotes’ or “Double smart quotes” ← → – — © ® ™ ¼ ½ ¾ … ˆ