Animated gif for a thumbs

To use gifs in WordPress you need to insert the full size of the uploaded gif (the original size).

In the Media Box : Size: Full Size

Any other size you choose will not render because of how GD crops and re-sizes the photos, it does so by taking a single frame, to make it animated you would have to recomposite the frames, something which WordPress does not do.

If your featured image is not inserting the full size that means your theme ( or a plugin) is altering which size can be inserted into the post. You can check by clicking:

“Set featured image” –> Select your gif –> look at ATTACHMENT DETAILS and compare the size you see to the original image.

ps. As far as I can tell this is due to GD and not WordPress (though it is possible to code).

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