Use case guide

Best Fonts for an Email Newsletter

Email typography is different from web typography because the reader's client decides what renders. A Google Font may load beautifully in one inbox and silently fall back in another, so the font you pick is only half the system; the fallback stack is the other half. These five open-source fonts are the strongest choices for newsletters in 2026, each with a note on how reliably it renders and the fallback it should ship with.

The Fonts

Lora

serifvariable4 weightsx-height: medium

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Lora: the quick brown fox jumps over the lazy dog

Lora is a calligraphic serif with brushed curves and a balanced text face. It works well for long-form reading and editorial body text.

blogeditorialbooklong-read

Source Serif 4

serifvariable8 weightsx-height: medium

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Source Serif 4: the quick brown fox jumps over the lazy dog

Source Serif 4 is Adobe's open-source workhorse serif, designed for long-form reading on screens. Its optical size axis allows it to perform from captions to headlines.

blogeditorialdocumentationlong-read

Merriweather

serifvariable4 weightsx-height: high

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Merriweather: the quick brown fox jumps over the lazy dog

Merriweather is a serif designed for on-screen readability with a slightly condensed text face, large x-height, and robust hairlines.

blogeditorialnewslong-read

Inter

sans-serifvariable9 weightsx-height: high

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Inter: the quick brown fox jumps over the lazy dog

Inter is a workhorse sans-serif designed specifically for computer screens. Its tall x-height and open counters make it exceptionally legible at small sizes, which is why it has become the default for modern UI design.

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Open Sans

sans-serif6 weightsx-height: high

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Open Sans: the quick brown fox jumps over the lazy dog

Open Sans is a humanist sans-serif optimized for legibility in print, web, and mobile. Its open forms and stress on vertical strokes make it a reliable body text choice.

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Recommended pairings for newsletter

Source Sans 3 + Lora

Source Sans 3 headings over Lora body. A humanist sans sets the section titles and a calligraphic serif carries the prose. The direction is reversed from the usual serif-heading layout, which gives pages a writerly feel.

contrast 81/100/Sans + Serif

Inter + Merriweather

Inter headlines over Merriweather body, an inverse editorial pairing. Sans-serif headings bring modern clarity; slab-serif body sustains long-form reading.

contrast 80/100/Sans + Serif

Montserrat + Open Sans

Montserrat headlines over Open Sans body, a popular marketing pairing. Montserrat's geometric forms bring energy to titles; Open Sans's humanist warmth keeps body approachable.

contrast 68/100/Sans + Sans

How Email Clients Decide Your Font

Email clients fall into two camps. Apple Mail, the iOS and macOS apps, and most Android clients support custom web fonts through @font-face. Gmail, Outlook on Windows, and Yahoo do not render them at all, and instead use whatever your fallback stack names. That split means a newsletter font system is really two systems: the ideal font for clients that support it, and a fallback stack that must carry the design for everyone else. The practical rule is to choose fonts whose fallbacks are close in character, so the design barely shifts when the webfont does not load.

Lora and Source Serif 4: Serif Bodies That Read

Lora is the strongest serif body choice for newsletters. It was designed for screen reading, has a warm, contemporary character, and its fallback to Georgia in unsupported clients is nearly invisible because both are sturdy serifs with similar proportions. Use Lora at 16 to 18px for article body text with a 1.5 to 1.6 line height. Source Serif 4 is the more neutral editorial alternative; it falls back cleanly to Georgia or Times New Roman and suits longer, magazine-style issues. Both keep long-form newsletter reading comfortable in clients that render them.

Merriweather: The Slab for Skimming

Merriweather is the serif that survives skimming. Its slab-serif construction and tall x-height make headlines and key paragraphs legible in a crowded inbox, which matters because most subscribers decide in two seconds whether to open or delete. Merriweather falls back to Georgia in unsupported clients without a jarring shift. Use it for section headings and pull-out quotes, paired with Inter or Open Sans for body, or use it as the body itself for a chunkier, more readable voice.

Inter and Open Sans: The Sans Options

Inter is the modern sans for UI-heavy newsletters: buttons, subject-line teasers, product updates, and anything with a technical voice. Its tall x-height keeps it readable at 14 to 15px, and in unsupported clients it falls back to Arial or Helvetica, which are close enough that the shift is acceptable. Open Sans is the warmer humanist alternative that falls back to Arial almost identically. Both are safe choices for transactional and product newsletters where the body is short and the call to action is the point.

Building the Fallback Stack First

The reliable way to design a newsletter is to design the fallback stack first and treat the custom font as a progressive layer on top of it. For a Lora newsletter, the stack is Lora, Georgia, serif; for Inter it is Inter, Arial, Helvetica, sans-serif. Pick the pair before writing a line of layout, set the body at 16 to 18px with a 1.5 to 1.6 line height and a measure near 60 characters, and keep headlines in the same family at a larger size rather than adding a third face. Then test the design in Gmail and Outlook, the two clients that strip custom fonts, because if it holds there it holds everywhere.

Test These Fonts Live

Every font above can be previewed live in the Font Blend tools. Pick one and test it against a real layout before you commit.

Typography playground Pairing generator All fonts

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