zhmars/vim-zoom

Increase or decrease font size like Chromium/Firefox.

Vim script

zoom

Zoom is a plugin which help users to increase or decrease font size like Chromium/Firefox.

Supports GUI

gVim (NOTE: Ctrl+ and Ctrl- may not work, see here)
equalsraf/neovim-qt
akiyosi/goneovim (use guifont config)