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There are other needs for a shortened URL. Perhaps you have to hardcode a link in code and don't want to be tied to a page whose contents may break. If you control your URL shortener, you can hardcode your shortened one, and update the redirect as needed.

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> Perhaps you have to hardcode a link in code and don't want to be tied to a page whose contents may break. If you control your URL shortener, you can hardcode your shortened one, and update the redirect as needed.

And when your URL shortener goes down, all links are dead. Shortening URLs is the last thing you want to do when you need to preserve pages that might go down. Caching is a better solution.

http://perma.cc addresses this problem.

Why would one use this over archive.is?

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