Installing Convertio or Vector Magic on your macOS should be straightforward. You can simply visit their respective websites and follow the instructions for downloading and installing the software. As for SVGStorm, it is an online tool and doesn't require any installation.

Regarding which program is the best, it depends on your specific needs and preferences. Convertio and Vector Magic are both highly rated and have their own unique features. You may want to try both and see which one works best for you.

If you prefer to use Homebrew/brew to install software, you can check if they are available in Homebrew's repository by running the command brew search convertio or brew search vector-magic. Keep in mind that not all software may be available through Homebrew.

Regarding your privacy concerns, you can ensure that your confidential data is not uploaded by using offline software or tools. In that case, you may want to consider installing Inkscape, a free and open-source vector graphics editor that can convert PNG and SVG files to AI format.
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