HexIt for Atom
HexIt is an Atom plugin that allows you to convert decimal numbers to hexadecimal numbers in your source files (and vice versa).
Demo

Install
Atom Package Manager
apm install hexit
Directly from Atom
Settings ➔ Packages ➔ Search for
hexit
Usage
In addition to the right-click menu entries, you can use HexIt with two other methods:
Keyboard Shortcuts
- Convert the selection to hexadecimal with CTRL-Shift-H
- Convert the selection to decimal with CTRL-Shift-D
Commands
- Convert the selection to hexadecimal with
hex-it:hex
- Convert the selection to decimal with
hex-it:decimal