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This question already has an answer here:

I uploaded an image from the web today, from

However SO takes the image and reuploads it to, if the image from web is from then it doesn't need to bother wasting space and bandwith hosting duplicates of the image.

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marked as duplicate by Oded Jul 10 '13 at 11:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

related:… – balpha Sep 24 '10 at 10:46
up vote 2 down vote accepted

The idea is making sure that the image is permanently available, which when linking to an external image is not ensured. You can however manually do this via ![alt text]( But please only do so when you're certain the image won't go away (I mean, even after years!)

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