PNG files are recommended. If you're using GIFs, please refer to our GIF Best Practices.
Sigstr offers hi-res functionality to guarantee crisp campaign images. Upon campaign upload, the application automatically constrains a campaign image to ensure high density of pixels. Those using high-res functionality need to upload images at twice the intended size. Below are the suggested design dimensions.
To avoid image distortion, it is advised to keep your campaign size consistent ongoing. This is especially important with Multi-Banner Campaigns.
Please upload images at 72 dpi.