What’s the optimum resolution for pictures?
Haiilo determines the optimum resolution or image size per teaser. The teasers always fill the entire width of the respective column – the aspect ratio remains the same depending on size. The image contained in this is always centered and cropped at the edges. This results in the following aspect ratios:

What image formats are supported?
The teaser widget supports the most common image formats. Which file formats are generally displayed with a preview in Haiilo, you can read here.
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.jpg
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.jpeg
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.png
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.gif
Why are teaser widgets sometimes not the same height, despite selecting the same size in the settings?

You can select various column designs (several columns, various widths,...) on homepages, pages and communities. There are different image sizes for the various column widths for optimum presentation. Every column is considered individually here and not in the context of other columns. This avoids the teasers in almost all setting versions from being almost square in the narrowest column. This rarely does justice to the teaser image.
Why am I unable to save an e-mail address in the teaser widget?
The teaser widget is not intended for sending e-mails. It is used to draw users’ attention to important and interesting news and content with the help of pictures and links.
Our suggestion would be to use the user profile widget where the contact details can be displayed directly.