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What types of formats are best for online advertising?

If you are using an online advertisement banner maker, there’s no need to worry about formats and sizes.

Tools like Bannersnack are constantly updated to meet the latest technical requirements.

However, if you are considering creating your advertisements offline, I would recommend you to ignore Adobe Flash. Instead, try making HTML5 banners for more compatibility. In fact, HTML5 is compatible natively with all web browsers available now. 

Another file format that is suitable for flyers and brochures is PDF. Although you need a third party PDF viewer in order to see the ads, most of your customers will probably have it installed already on their devices. 

Also, for static banners, traditional .JPEG and .PNG graphics formats may also be suitable for your advertisements.