The Email Signature Handbook
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Email Signature Size


By Exclaimer

It is important the email signature size you choose works.

Email signature size is more important than you might think. Ordinarily, most experts recommend that a signature can be any size you wish it to be. However, given our 20 years of experience, we have a clear set of guidelines we use to ensure an email signature is the perfect size to work on all devices.

Firstly, ask yourself if you know what devices your target audience are likely to read their emails on? Will they read them at their desk at a PC/Mac? Or do you think they will access content on the move via a smartphone or tablet? If you know this, you’ll be better placed to work out what the optimal email signature size should be.

Mobile email signature size

For mobile users, we recommend that the email signature dimensions are 320 pixels in width. This is because mobile device screen sizes are typically between 320 to 500 pixels wide. Your best bet is to target the lowest screen dimensions so that your signature appears at the highest quality on mobiles.

The email signature size on mobile device should be 320px.

Desktop email signature size

For desktop users, the industry standard email signature size is about 650 pixels in width. However, we recommend that you use the slightly smaller dimension of 600 pixels wide and between 150 to 200 pixels high. This will make it a lot easier to create a clean email signature design that won’t have its edges cropped.

Alternatively, to reduce scaling issues on mobile devices, ensure the email signature size is 450 pixels in width. This also ensures that there is plenty of space to include all relevant contact details.

Email signature dimensions

Images such as a company logo, social media icons or display banners are integral to a professional signature design.

The ideal email signature image size should be 300 to 400 pixels wide and 70 to 100 pixels high. If the image is a banner, we recommend a maximum height of 100 pixels.

The image should also be optimized for a web resolution of 72dpi so it displays correctly.

Other considerations

If an email signature image size is too large, it becomes very distracting to any recipient and ends up overpowering the actual email content itself. Remember that you are emailing someone for a reason, and you don’t want your signature to get in the way of the message.

Don’t make the email signature image size too big.

However, making images too small can be just as bad as recipients will find them hard to see. Do you honestly think people will click on something like promotional banner if they can’t actually see what it’s for?

You should also always build your email signature template in HTML rather than using a program like Microsoft Word. If you don’t, email clients might render images incorrectly.

Finally, try to keep images to a file size of below 50kb. The bigger the email signature image size is, the longer it will take for your message to be sent and received by recipients.

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