What software do you use to edit Gig image ?

[pro_shazzad]

What software do you use to edit Gig image for improving your gig ?

[seven_sign]

I use photoshop and illustrator as needed.

It depends on your skills.

If you're skilled with photoshop or illustrator, you can do by that.
If you don't have any skills then you can try canva.

[yoavediting]

I used a site called 'Canva' to create my gig image. 
It's not free, but it's great.