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The shortened URL contains 25 characters. Actually it could be smaller but the goal is to generate the smallest QR code. To do so, a restricted set of character

The shortened URL contains 25 characters. Actually it could be smaller but the goal is to generate the smallest QR code. To do so, a restricted set of characters is used. The result is a small QR code version 1. There is currently no limitation on input URL size. However you might reach some limitation (> 4096bytes) due to the current proxy.

strencher 6y ago
great job! But, you didn't answer nonsapreiche's question about how long the shortened URL will last?
- rmedaer 6y ago
  Right! Currently there is no plan to remove shortened URL. Meaning that the service keep shortened URL indefinitely.