Font pairing
Source Serif 4+Inter
Source Serif 4 headings over Inter body, a quiet, professional pairing that scales from documentation to long-form articles. Both fonts have optical-size axes, so headings retain their crispness at any scale.
Both Source Serif 4 and Inter were designed for screens with reading as the priority. Their shared DNA, generous x-height, open counters, restrained contrast, creates a pairing where headings feel composed rather than ornamental.
The art of typography
Typography is the visible voice of design. The right pairing balances contrast with consistency, a heading face that earns attention, a body face that earns trust. Test it at the sizes you actually ship, on the surfaces your readers actually use.
Source Serif 4 (heading)
Inter (body)
Contrast Check
AAAThe quick brown fox
jumps over the lazy dog · 0123456789
- AA normal
- passes
- AA large
- passes
- AAA normal
- passes
- AAA large
- passes
Default colors come from the Editorial Cream palette. Adjust above to test your own combination, these are the recommended heading text against the recommended body / surface color.
Mood
Use cases
Tags
How to Use This Pairing
This Source Serif 4 + Inter pairing works by combining the visual energy of a serif typeface for headlines with the sustained readability of a sans serif for body text. The contrast in typeface classification creates a clear hierarchy that guides the reader from headline to body without confusion.
For the heading, use 600 or 700 weight, enough to anchor the page without overwhelming the layout. For body text, 400 or 500 weight keeps reading comfortable across paragraphs. If your layout calls for subheadings, step down one weight from your display heading to maintain clear distinction between levels. See the type scale calculator to generate a scale with mathematically coherent steps.
The mood keywords for this pairing, editorial, professional, classic, describe the overall feeling the combination creates. Match these to the emotional register of your content. Formal content suits more neutral moods; creative or lifestyle brands benefit from warmer or more distinctive combinations. Browse all font pairings to compare mood categories and find a pairing that matches your brand tone.
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.
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.
Production Code
Copy-paste into your project, no build step required.
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Source%20Serif%204:wght@600;700&family=Inter:wght@400;500&display=swap" rel="stylesheet">Setting It up in Your Project
Start by loading both fonts from Google Fonts using the production code snippet above. If you are using the Google Fonts link, both Source Serif 4 and Inter load from a single URL. The Google Fonts API serves fonts from Google's global CDN with automatic version updates. For self-hosting or a design token approach, copy both the heading and body font-face declarations and assign them to distinct CSS custom properties.
In your CSS, set the heading font family on all h1 to h6 elements, and the body font family on the body or p selector. Using CSS custom properties for font families makes it easy to swap fonts across the entire site by editing one line.
This pairing works best when the heading size creates clear visual hierarchy above the body text. A common starting ratio is 2.5 to 3 times the body font size for h1, stepping down by approximately 1.2× for each subsequent heading level. Use the type scale calculator to generate a mathematically coherent scale.
Line-height for body text should sit between 1.4 and 1.6 times the font size for comfortable reading. Headings benefit from tighter line-height, 1.1 to 1.25 times, to bring the lines close enough that they read as a single unit rather than a list.
Related Pairings
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Good typography is the visible voice of design, quiet when it should be, loud when it must.
PreviewBitter + Inter
Bitter headings over Inter body. A slab serif tuned for screen reading sits on top of the most legible UI sans available.
The art of typography
Good typography is the visible voice of design, quiet when it should be, loud when it must.
PreviewPlayfair Display + Inter
A classic editorial pairing: high-contrast Playfair Display headings over a neutral Inter body. The contrast between the ornate serif and the technical sans establishes clear hierarchy while remaining highly readable.
The art of typography
Good typography is the visible voice of design, quiet when it should be, loud when it must.
PreviewFraunces + Inter
Fraunces headlines over Inter body, a contemporary luxury editorial pairing. Fraunces' variable optical sizing and soft axis let headings move from text to display while staying coherent.
Frequently Asked Questions
- What makes a good font pairing?
- A good pairing creates contrast through typeface classification while maintaining harmony in style, x-height, and overall proportion. The heading typeface should be visually distinct from the body typeface, a serif with a sans-serif, a geometric with a humanist, so the reader instantly understands the hierarchy without needing to read the text. At the same time, the two faces should share enough character that they feel like they belong to the same design system.
- Can I swap the heading and body fonts?
- This pairing is designed with Source Serif 4 as the heading and Inter as the body. Swapping them, using Inter for headings and Source Serif 4 for body, is technically possible but typically not recommended. Each typeface is chosen for its strengths at its intended size range. Source Serif 4 has design characteristics that work best at display sizes, and Inter is optimised for sustained reading at body sizes.
- Which CSS weights should I use for this pairing?
- For headings, this pairing is designed to work with 600 or 700 weights. For body text, 400 or 500 weights provides the best balance of legibility and visual weight. If you are using a variable font, you can fine-tune the weight to match your layout exactly rather than snapping to fixed steps.
- Is this pairing free for commercial use?
- Both Source Serif 4 (OFL-1.1) and Inter (OFL-1.1) are open-source fonts with permissive licenses. They can be used in personal and commercial projects, including client work, without attribution requirements. Confirm with your legal team if you are building a product that redistributes fonts, since some uses have specific license requirements.
Want a Different Combination?
Try the deterministic pairing generator or open the typography playground to mix your own.