


The question is always: what size should those images be? Give me a standard! Unfortunately, there is no such standard to quote here, but I can tell you what I found from my years of experience. Including a logo or a photo in your email signature has been common practice for a long time.

We recommend a logo take up 150px - 300px of width, but be saved at 2x the resolution so 300px - 600px. Especially with the prevalence of mobile email, this seems wise. In general, I would recommend keeping your signature smaller so that it appears nicely on both desktop and mobile devices. So in today’s world there isn’t always a clear answer for which to go with. This is partially good because it means that the signature may not appear broken, but it can also be bad because elements within the signature can become too tiny to read or be useful. Many mobile email clients will scale email signatures down to their screen size. These devices are typically held in portrait mode and tend to render emails at around 400 pixels, but the actual width can vary greatly.
