When I posted the ABCs of Programming earlier this week, I embedded a video from YouTube. The video looked fine on my iMac, but when I looked at it on my iPhone, it was hideously oversized. A quick google search lead to this fantastic utility.

Just paste in the URL and it automatically generates responsive embed codes. Works with YouTube, Vimeo, Google Maps, Instagram, Vine, and more.

Update: I just learned that Bootstrap already includes responsive embed by default.