Source Serif 4

serifsource200 · 300 · 400 · 500 · 600 · 700 · 800 · 900· OFL-1.1· Frank Grießhammer

Size56pxWeight

mcpConnect your agent — pair Source Serif 4 live

live endpoint

Point any MCP client at the shared fonts endpoint and your agent can search this exact catalog and suggest pairings — list_fonts and suggest_fonts, read-only, no key.

endpointhttps://mcp.brandsweets.com/fonts/mcp

claude mcp add --transport http brandsweets-fonts https://mcp.brandsweets.com/fonts/mcp

try this prompt

›find me a heading font that pairs with Source Serif 4

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Pairs well with

Source Sans 3

sanssource200 · 300 · 400 · 500 · 600 · 700 · 800 · 900

Paul D. Hunt · OFL-1.1

View specimen →

Same superfamily as Source Serif 4 — shared skeleton, natural body pairing.

Open Sans

sans300 · 400 · 500 · 600 · 700 · 800

Steve Matteson · OFL-1.1

View specimen →

fits body; hand-vetted

Roboto

sansroboto100 · 200 · 300 · 400 · 500 · 600 · 700 · 800 · 900

Christian Robertson, ParaType, Font Bureau · Apache-2.0

View specimen →

fits body; hand-vetted

Inter

sans100 · 200 · 300 · 400 · 500 · 600 · 700 · 800 · 900

Rasmus Andersson · OFL-1.1

View specimen →

fits body; hand-vetted

Montserrat

sans100 · 200 · 300 · 400 · 500 · 600 · 700 · 800 · 900

Julieta Ulanovsky, Sol Matas, Juan Pablo del Peral, Jacques Le Bailly · OFL-1.1

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fits heading; hand-vetted

More serif fonts

Playfair Display

serifplayfair400 · 500 · 600 · 700 · 800 · 900

Claus Eggers Sørensen · OFL-1.1

View specimen →

Roboto Slab

serifroboto100 · 200 · 300 · 400 · 500 · 600 · 700 · 800 · 900

Christian Robertson · OFL-1.1

View specimen →

Noto Serif

serifnoto100 · 200 · 300 · 400 · 500 · 600 · 700 · 800 · 900

Google · OFL-1.1

View specimen →

Merriweather

serifmerriweather300 · 400 · 500 · 600 · 700 · 800 · 900

Sorkin Type · OFL-1.1

View specimen →

Lora

seriflora400 · 500 · 600 · 700

Self-host embed

Source Serif 4 is free to self-host under OFL-1.1. Drop these @font-face rules into your CSS — the .woff2 files are served straight from BrandSweets.

css

@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 200;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-200.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 300;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-300.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-400.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-500.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-600.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-700.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-800.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 900;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-900.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 200;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-200i.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 300;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-300i.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-400i.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 500;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-500i.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 600;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-600i.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 700;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-700i.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 800;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-800i.woff2") format("woff2");
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 900;
  font-display: swap;
  src: url("https://fonts.brandsweets.com/source-serif-4/source-serif-4-900i.woff2") format("woff2");
}

/* Usage */
.heading { font-family: "Source Serif 4", serif; }

License & attribution

License: OFL-1.1
Designed by: Frank Grießhammer
Weights: 200, 300, 400, 500, 600, 700, 800, 900
Languages: cyrillic, cyrillic-ext, greek, latin, latin-ext, vietnamese

Machine-readable: font.md

Build a brand around Source Serif 4

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Extract a brand Design one on a canvas