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This question already has an answer here:

So I did add Glare in Compositing mode and when I render, it works as it should.

But when I try to render it with transparent background, it's not working. Why?

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marked as duplicate by cegaton, VRM, Ray Mairlot, David Jan 2 '18 at 17:44

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To see the glare in action, I would do this:

enter image description here

So the glare is working, but it doesn't affect the alpha channel. To make it do so, I'm setting the mix value to 1 to make the node output only the glare. I'm adding the glow to the image and the alpha, so it will be part of the alpha channel too. I'm then recombining them with a set alpha node.

Remember to clamp the add on the alpha, as it should never be greater than 1 (or smaller than 0)

I hope this helps you :D

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