Tender Surrender

The simplest answer is to use toBlob() from the canvas DOM element (not the context). However, while this is implemented in Firefox, unfortunately it is not yet implemented in Chrome. Therefore, you can use the method below to create a Blob in any image format, such as PNG or JPEG.

My job is as a Chrome Developer Advocate at Google. Starting last week (April 2013), Google Japan began hiring for this Chrome Developer Advocate position. We are also hiring for similar roles across Google+, YouTube, Android, and other products, but since people often ask me about it—and I've had several requests—I'd like to take this opportunity to explain what a Developer Advocate actually does.