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Why is a URL sometimes required when sharing to tumblr?

Tumblr limits animated gifs posted through their API to 3mb in file size. If you attempt to share a GIF that is over that limit, tumblr discards the animation information and only shows the first frame.

If Giffer detects that the gif you're trying to share is over 3mb, after you tap "Post" on the tumblr share screen, the gif will be uploaded to and shared to tumblr as an "external image."

By uploading your gifs to you agree to Giffer's terms of use.

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