Extend US visa in Canada

I am Vietnamese. Can I extend my US visa while I am in Canada? If I can do that, please advise how to do it.
Best Answer
You cannot extend a US visitor's visa while you are in Canada, but you can apply for a new one at a US diplomatic mission in Canada.
You can also re-enter the US with an expired visa if you've been in Canada for no more than 30 days, thanks to automatic revalidation. This seems unlikely to help you since you have indicated that you are now in Canada and wish to enter the US later this summer, which suggests that you will have been outside the US for more than 30 days.
Be careful not to confuse visa validity with duration of stay. The former is indicated by the "expires on" date on the visa sticker. The latter is usually written into your passport on the admission stamp. For more information, see What the Visa Expiration Date Means.
To get a new visitor visa, and to be admitted to the US as a visitor, you will have to convince the visa officer and immigration officer, respectively, that you do not intend to immigrate to the US and do intend to meet the requirements placed on visitors. If you have recently spent a significant amount of time in the US, this will be more difficult.
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Quick Answer about "Extend US visa in Canada"
Can US visa be extended?
If you came to the United States on a nonimmigrant visa and you want to extend your stay you must apply with USCIS before your authorized stay, denoted on your admission stamp or paper Form I-94, expires. It is recommended you apply well in advance of your expiration date.Can visa be extended in Canada?
In most cases, you must apply online to extend your stay as a visitor (get a visitor record). You must meet our entry requirements to return to Canada.Can I extend my US immigrant visa?
If you want to extend your I-94 date or extend US visitor visa stay in the United States, you must file a request with U.S. Citizenship and Immigration Services (USCIS) on the Form I-539, Application to Extend/Change Non-immigrant Status before your authorized stay expires.Can I apply for a US visa while visiting Canada?
All applicants in Canada between the ages of 14 and 79 intending to apply for U.S. Visitor Visa while in Canada may need to apply in person at a U.S. Consulate or Embassy. Those in London, Ontario should schedule an interview at the U.S. Consulate in Toronto.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
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