Adding fonts to the keynote for web

I assume you mean Keynote for iCloud.

It is not possible to add extra fonts to Keynote for iCloud, it is a cut down version of the full application.

If you need additional fonts and the full range of tools for Keynote, you should use the two main Keynote applications:

Keynote for Mac and Keynote for iOS.

These applications are available at no cost.

hen181 wrote:

is this gonna be available soon?

Nobody in these forums has any info about Apple's plans. You can ask them to add the feature you want via

http://www.apple.com/feedback

but I would not be optimistic given the many years that have passed already without doing it. Best use a different app to meet your needs.