Zip multiple files into individual .gz files (windows)

  7zip, gzip, windows

Hoping somebody might be able to help me find a quicker way to do this:

I have 640 files that each need to be individually zipped into their own .gz file.

7-zip only allows zipping of 1 file to .gz at a time. Is there a way I can do all 640 in one go, while retaining them as individual files? (running windows)

Thanks in advance!

Source: Windows Questions