Banner Designs for SaaS platform

Although it is easy to find graphic designers on platforms like Fiverr and UpWork to build banners but I think you can consider the following banner builders:

Google Web Designer: If you are looking for a free platform to build banners then you can easily create banners here. You can just need to pick different dimensions. It only supports measuring the banner size in pixels but you can also consider using this https://ruler.onl/ actual size online ruler to measure the size of the ad into inches and cm. Yes, with Google Web Designer, this app could be a good fit to create demanded banner ads in appropriate sizes.

BannerBoo: This is the perfect choice if you want to build one of the best banners for social media apps. You just need to signup there https://bannerboo.com/ and can access free templates and make one of your favourite banners for LinkedIn, Twitter, Instagram and Facebook. I love their animated banners.

Canva: Nowadays, I am using Canva to create infographics and cover images but yes you can also try it to generate banners. You just need to edit already available social media banners.

I hope these tools would work.