Use unicodeit for a web latex-to-unicode converter.

If you want to setup a keybinding

If you're on linux install xsel and pip install unicodeit and do something like

#!/bin/sh
python -m unicodeit.cli "$(xsel)" | xclip -selection clipboard
unicode=$(python -m unicodeit.cli "$(xsel)")
echo "$unicode" | xclip -selection clipboard
notify-send "copied $unicode"

Note that

If you're on mac follow the automator setup described here.

If you're on windows I feel sorry for you, but you can probably setup a keybind with autohotkey.