Check out PopEmote - a free Twitch emote resizer tool.

If you are a Twitch streamer, you know how important emotes are for building community. Getting your emotes sized correctly for upload can be frustrating though.

PopEmote is a free browser-based tool that resizes your emotes to the exact dimensions Twitch requires: 28x28, 56x56, and 112x112 pixels. No software to install, no account needed.

The tool also includes a chat preview feature so you can see exactly how your emote will look in a real Twitch chat before downloading.