How to resize logos for your email signature

The size of your email signature is more important than you might think. There are tons of ways you can design one to optimise this small yet effective marketing tool.

One of the first areas to consider when creating an email signature is what are your audience likely to view your emails on. Email signatures differ when viewing on a smartphone or tablet compared to desktop email apps and it can completely alter the layout…

What’s the best size for your email signature?

Mobile email signature design size

Mobile devices are small so think about how much space your email signature will take up on the screen. To optimise your email signature for mobile, we recommend sticking to around 320 pixels wide maximum. Device screens are typically between 320 and 500 pixels wide, so going for the lowest dimensions will help to keep it looking sharp on all screens.

Desktop email signature size

It can be difficult to differentiate when choosing between optimising your email signature for desktop or mobile. The answer really should be both. However, if most of your recipients view them on desktop, use a signature of up to 600 pixels wide and up to 200 pixels high. If you want to reduce scaling issues from mobile to desktop or vice versa, opt for an email signature of 450 pixels wide.

Creating email signatures with Rocketseed eliminates this problem as our email signature software automatically renders your new signature at the correct size across all devices.

Optimum file size for email signatures

Email signatures should be a small file size, so they load correctly on the recipient’s email client. Anything too large may end up in spam. Keep the file size below 50kb but try to make it smaller if possible. 

How to resize a logo for an email signature?

The best way to avoid having to resize a photo for your email signature is to create your design in the optimum size that you want it to appear. Resizing your email signature, logo or image varies in different email clients. Some examples of how to resize your email signature image are below:

How to resize an email signature image in Gmail

1. Select Settings in the top right corner of your Gmail app then See all settings.

2. Scroll down to the Signature settings, there is an option to add or customise the existing format. (Gmail offers the ability to add an image or change the text style in this section).

3. To insert your image, go to the image icon in the toolbar. Here, copy the URL of the selected photo or insert an image from your Google Drive, or files.

4. Once selected, upload the picture.

5. Resize the image by selecting small, medium, or large settings. You can also use the actual size if you have designed it in the optimum size.

6. Click Save Changes once you’re done.

How to resize an email signature image in Office 365

Outlook prefers images to be resized before you use them in an email signature. However, there are a few ways to get around it if you need to resize it.

Resize the image in the email message

1. Create a new email in Outlook.

2. Select the Insert tab in the options and click the Signature button.

3. Choose the signature you want to resize.

4. When the image has been inserted into the email, select the picture and drag the edge to adjust its size.

5. Once you’ve resized it, it’s time to copy the changes. Use ‘Ctrl + A’ to select all, and ‘Ctrl + C’ to copy it or ‘Command + A’ to select all, and ‘Command + C’ to copy it on Mac.

6. Go to Insert, Signatures, and in the Signatures and Stationery box, select the source signature.

7. In the edit section, remove the signature in this box and paste the new one in it.

8. Click OK to save changes.

How to resize the logo by modifying the HTML file

1. Start by going to File and click Options.

2. In the new window, select the mail tab, and the Signatures button should be in the right pane.

3. In the pop-up window, you will see all your signatures. Signatures come in three formats – Text, Rich text, and HTML.

4. Right-click on the HTML option and select Open With Microsoft Word.

5. Your file will open in Microsoft Word. Select the picture and drag the edge to adjust its size.

6. Save any changes by pressing ‘Ctrl + S’ or ‘Command + S’ on Mac.

7. Close the file and reopen Outlook, and your new resized logo should appear in new emails.

By creating your email signature with Rocketseed you avoid these issues as there’s no HTML required at any stage.

When resizing any images for your email signature, be careful with quality. Low-resolution images may appear blurry or pixelated depending on the resize if not in the optimum format. Low-quality images will negatively impact you as a whole because of it, making you look unprofessional, so ensure that high-quality images are always a priority, especially when resizing. See our best email signature sizes guide for more email banner and signature best practices.

It’s essential for a professional brand image that your email signature displays at the right size across all devices. As you can see, re-sizing signatures and elements like logos can be time-consuming, and will your employees all get it right?

It’s far easier to get all your employee signatures sized right the first time with Rocketseed. There’s no HTML required and it’s compatible with all email clients including Office 365 and GSuite. You can update company-wide signatures centrally and our signature software automatically renders all your business email signatures at the right size across all devices.

Ensuring your email signatures are always professional and consistent doesn’t have to be complicated with the right tools and capabilities

Email Signature Management | Email Signature Marketing | Dynamic Email Banners | CRM Integration | Analytics & Reporting | Support & Service

Want to save time by sizing your signature the simplest way?