Christian Leuenberg

WordPress comes with a built-in replacement function that turns 🙂 etc. into emojis. If you need to switch this off, simply install and activate this plugin. It’s that simple.

Really Disable Emojis

Disables the automatic emojis (smilies) replacement function. Really! :-)

Samuel Wood (Otto)

Replace the smilies with the original versions from previous versions of WordPress.
Added bonus: Disables all “emoji” functionality in WordPress 4.2 and above.

Classic Smilies

I have been using this plugin and I proudly recommend to everyone.
PRO
- It improve performance by removing inline JS and reducing HTTP requests.
Cons
- Smiley images shouldn't be look dull. It could be appear clear like Original.

Thanks & Regards,
Gulshan

Very goood plugin, some improvement needed

Replace the smilies with the original versions from previous versions of WordPress.

Really Disable Emojis vs Classic Smilies