Best Fonts for Email Signatures: Safe Choices and Fallbacks
TL;DR: An email signature can only show a font the reader already has, unless their email app loads web fonts, and many do not. The safest choices are fonts that come with both Windows and Apple devices: Arial, Georgia, Verdana, Trebuchet MS and Times New Roman. Calibri and Segoe UI are on every Windows PC but not on a Mac or iPhone. Helvetica is the reverse. Whatever font you choose, follow it with a fallback list so every reader sees something close to what you intended.
How we checked: font availability comes from Microsoft’s Windows 11 font list and Apple’s system font list. Web font support comes from Can I email, which tests HTML and CSS in email apps. All three were checked in October 2026. We have not tested every font in every email app, so send yourself a test before you roll a signature out.
Why fonts behave differently in email
On a website, you can send the reader your brand font along with the page. Email mostly cannot. When an email arrives, the reader’s email app draws the text with fonts installed on their own device. If the font your signature asks for is not there, the app picks another one.
Some email apps can download a font, as a website does. Web designers call this a web font. But support is patchy:
- Apple Mail on Mac, iPhone and iPad loads web fonts.
- Gmail in a web browser does not. Gmail’s iPhone and Android apps do.
- Classic Outlook for Windows support is partial. When it fails, some text can fall back to Times New Roman, which looks very different from a modern sans-serif.
That comes from Can I email’s web font support table, which lists more apps and versions. The practical result is simple. Many of your recipients will never see a web font, so the font they do see must be one they already have.
Fonts that are safe everywhere
These fonts come with Windows 11 and with Apple’s macOS and iOS. A signature that uses one of them looks the same for almost every reader on a computer, iPhone or iPad.
| Font | Style | Windows 11 | Mac | iPhone and iPad |
|---|---|---|---|---|
| Arial | Sans-serif | Yes | Yes | Yes |
| Verdana | Sans-serif, wide and very readable at small sizes | Yes | Yes | Yes |
| Trebuchet MS | Sans-serif, slightly more character | Yes | Yes | Yes |
| Georgia | Serif, designed for screens | Yes | Yes | Yes |
| Times New Roman | Serif, traditional | Yes | Yes | Yes |
Sources: Microsoft’s Windows 11 font list and Apple’s system font list, both checked in October 2026.
For most organisations, Arial or Verdana is the right default for body text. Verdana is wider, so it stays readable at the 11–12 pixel size used for contact details and legal text. Georgia is the safest choice if your brand uses a serif.
Fonts that only work on some devices
| Font | Where it is installed | What happens elsewhere |
|---|---|---|
| Calibri | Windows | Not an Apple system font, so Mac and iPhone readers see your fallback |
| Segoe UI | Windows | Not an Apple system font, so Mac and iPhone readers see your fallback |
| Tahoma | Windows and Mac | Only an optional download on iPhone and iPad |
| Helvetica | Mac, iPhone and iPad | Not in the Windows 11 font list, so Windows readers see your fallback |
Calibri catches many organisations out. A signature written in Calibri looks right to everyone in a Windows office. The same signature looks different to a customer reading on an iPhone.
Android phones are not covered by either list. Android uses its own fonts and falls back to them when a named font is missing. That is one more reason every font list should end with a generic family, as shown below.
How to write a font fallback
In HTML, you do not name one font. You name a list, in order of preference, and the email app uses the first one it has. This list is called a font stack. End it with a generic family (sans-serif or serif), so the app always has something sensible to use.
Safe stacks to copy:
- Clean sans-serif:
font-family: Arial, Helvetica, sans-serif; - Wide, readable sans-serif:
font-family: Verdana, Geneva, sans-serif; - Screen serif:
font-family: Georgia, 'Times New Roman', serif; - Windows brand look, safe on Apple:
font-family: Calibri, Arial, sans-serif;
Put font names that contain a space, such as 'Times New Roman', in quotes. If you use a brand font, Can I email notes that classic Outlook can fall back to Times New Roman instead of your stack. Adding Outlook’s own mso-font-alt property, naming a safe font, avoids that. Why Designing HTML Emails for Outlook Is Still a Nightmare covers this and Outlook’s other quirks. Apply the stack inline, on each piece of text, rather than once in a <style> block. Some email apps ignore <style> blocks in the body of an email, which is where a signature sits. Email Signature Branding explains why.
If your brand uses a custom font
Most brand fonts are not installed on readers’ devices. You have three options:
- Pick the closest safe font and use it everywhere. This is the most consistent option. Choose a safe font with a similar shape. Use Arial for a plain sans-serif brand font, Verdana or Trebuchet MS for a wider or rounder one, and Georgia for a serif.
- Name the brand font first, then a safe fallback. Readers with a supporting app, such as Apple Mail, see the brand font. Everyone else sees the fallback. Check that the signature looks good in both, because many readers will see the fallback.
- Put the brand font in the logo only. Your logo is an image, so it always shows the right typeface. Keep the text in a safe font. This is how many organisations keep their brand without risking broken text.
Do not turn your name, phone number or legal details into an image to force a font. Many email apps block images until the reader allows them, and text in an image cannot be copied, searched or read by a screen reader.
Font size and style
- Name and job title: 13–14 pixels.
- Contact details and legal text: 11–12 pixels. Smaller than 11 pixels becomes hard to read.
- Two weights at most: regular and bold. Light and thin weights are often missing, and the app may replace them with regular.
- One font family, or two at most: perhaps a serif for the name and a sans-serif for the rest.
These match the sizes in the size table on our branding page, which covers the rest of the signature’s dimensions.
Frequently asked questions
Why does my signature look different when I send it from Outlook on a Mac?
The font you chose may not be installed on the Mac. A signature written in Calibri or Segoe UI on Windows falls back to another font on a Mac. Name a font the Mac has in your font stack to control which one. Add a safe font, such as Arial, after your first choice.
Is Comic Sans or a script font ever a good idea?
Rarely. Comic Sans MS is installed on Windows, but most readers find it out of place in business email. Script and handwriting fonts are hard to read at small sizes. Most are not installed on readers’ devices either, so they fall back to something plain anyway.
Can we use Google Fonts in an email signature?
You can link to one, but it only shows in email apps that load web fonts. Gmail in a web browser, Google’s own email service, does not. So a Google Font in a signature needs the same safe fallback as any other brand font.