When streaming live on Crowdcast using the in-browser method to go live, and not RTMP, you'll see an "HD" icon when you hover over your screen which can allow you to stream in HD.
When the icon is red, HD is off and you're streaming at a resolution of 480p.
When the icon is green, HD is on and you're streaming at a resolution of 720p.
Things to remember:
• To stream up to 720p you have to have a camera that supports it. Most modern webcams and laptops support a 720p resolution.
• Crowdcast saves the settings from your most recent session, so you only need to set it once and it'll remember it for next time.