Serif · Frank Grießhammer
Source Serif 4
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CSSfont-family: 'Source Serif 4', serif; font-weight: 400; font-style: normal; font-optical-sizing: none; line-height: 1.1;
Source Serif 4 is a free serif by Frank Grießhammer, on Google Fonts since 2021. Among the 354 serifs on FontKind, Source Serif 4 has an average x-height, is of average width and, at its regular weight, is darker than 72%. Its thickest strokes are 2.1 times its thinnest: high stroke contrast.
01 / Light table
Laid on top of Noto Serif Japanese
Source Serif 4 on one light table with its two closest fonts, Noto Serif Japanese (96 out of 100) and ElstobP (79). Noto Serif Japanese is 10% wider and 19% lighter, with more stroke contrast; ElstobP is 10% narrower, with more stroke contrast and an x-height 8% shorter.
Source Serif 4 and Noto Serif Japanese laid on top of each other.
Ink shared with Source Serif 4Noto Serif Japanese…
Most different letters first; the figure is the share of ink the fonts have in common. Where the fonts agree the letters cancel to black: every white sliver is a real difference.
02 / Letters
The Source Serif 4 alphabet
Capitals, lowercase, figures and signs · weight 400
Tap the letters you like, here and in other fonts, to find the fonts whose letters look most like them.
- &
- ?
- !
- @
- %
- (
- )
03 / Weights
Source Serif 4 in 8 weights
8 weights, 200–900, with italics · variable from 200 to 900
Variable weight, 200 to 900
- 200 Extra light, with its italic
- 300 Light, with its italic
- 400 Regular, with its italic
- 500 Medium, with its italic
- 600 Semibold, with its italic
- 700 Bold, with its italic
- 800 Extra bold, with its italic
- 900 Black, with its italic
04 / Facts
Who made Source Serif 4, and can you use it?
- Designer
- Frank Grießhammer
- Kind
- Serif
- Styles
- 8 weights, 200–900, with italics
- Variable axes
- Optical size 8–60, Weight 200–900
- On Google Fonts since
- 2021
- Character sets
- cyrillic, cyrillic-ext, greek, latin, latin-ext, vietnamese
- Licence
- SIL Open Font License 1.1
Can I use it?
- Commercial use
- Yes.
- Logos
- Yes.
- Websites and apps
- Yes. Self-hosted or loaded from Google Fonts.
- PDFs and documents
- Yes.
- Changes
- Yes.
- Sharing the files
- Yes, but not for sale. With the licence.
Source Serif 4 is under the SIL Open Font License 1.1. This is a plain summary, not legal advice: the licence itself decides.
Already in your apps?
- Google Docs
- Most likely. Under More fonts, in Sheets and Slides too. Google’s guide
- Word, PowerPoint
- No. Install it from Google Fonts first. Microsoft’s list
- Figma
- Yes. Built in, nothing to install. Figma’s help
- Canva
- Not verified. Search its font menu for Source Serif 4, or upload it with Canva Pro. Canva’s help
- Cricut
- Once installed. Design Space lists Source Serif 4 under System. Fonts for Cricut →
From each app’s own font list or help pages, read on 28 September 2026.
05 / Measurements
Source Serif 4, measured
Taken from the font file's own outlines, regular style
- x-height
- 47.5% of the emlowercase x
- Cap height
- 67.0% of the emcapitals
- x / cap
- 0.71lowercase against capitals
- Width
- 51.0% of the emaverage lowercase
- Ink
- 45%letter box filled
- Contrast
- 2.09 : 1high stroke contrast
Where it stands among serifs
Ranked against all 354 serifs on FontKind
x-heightNear the middle of serifs
WidthNear the middle of serifs
InkDarker than 72% of serifs
ContrastNear the middle of serifs
06 / Similar fonts
Fonts similar to Source Serif 4
Matched letter by letter · its own family apart
Source Serif 4's letters under another nameCactus Classical SerifChiron Sung HKBpmf Zihi Kai Std
- Noto Serif Japanese9610% wider · 19% lighter · more stroke contrast
- ElstobP79more stroke contrast · 10% narrower · x-height 8% shorter
- Elstob77more stroke contrast · x-height 8% shorter · 7% narrower
- Rufina76more stroke contrast · 10% lighter · 4% wider
- Crimson Pro71x-height 12% shorter · 10% narrower
- Gulzar70x-height 7% shorter · 7% narrower · more stroke contrast
All 100 fonts similar to Source Serif 4 →Compare side by side →Get Source Serif 4 on Google Fonts
07 / Swap
Swap Source Serif 4 without a jump
Running text within 3% of the width, x-height within 5%
- Song Myung69text 1.4% narrower · x-height 3.8% shorter
- Charis SIL69same text width · x-height 1.5% taller
- Castoro68same text width · same x-height
- Gambetta67text 2.0% narrower · x-height 4.8% shorter
- DM Serif Text63text 1.1% narrower · x-height 1.1% taller
- Frank Ruhl Libre63text 2.6% narrower · x-height 1.5% shorter
Fallback while it loads
Until Source Serif 4 loads, this sets Times New Roman in its place at 111.9% of its size, so running text keeps Source Serif 4’s width and lines keep their height: nothing moves when it arrives.
@font-face {
font-family: 'Source Serif 4 Fallback';
src: local('Times New Roman');
size-adjust: 111.90%;
ascent-override: 92.58%;
descent-override: 29.94%;
line-gap-override: 0.00%;
}
font-family: 'Source Serif 4', 'Source Serif 4 Fallback', serif;08 / Pairs
Used together with Source Serif 4
Of the 10,927 home pages that load Source Serif 4, the share that load each font too, and how that compares with chance.
Same page, not which sets the headings · HTTP Archive , 1 September 2026
- Inter18%2,014 sites · 1.8× chance
- Source Sans 39.5%1,041 sites · 19× chance
- Roboto6.2%679 sites · 0.3× chance
- Open Sans6%660 sites · 0.3× chance
- Playfair Display4.8%521 sites · 1.8× chance
- JetBrains Mono4.5%497 sites · 9.1× chance
More than chanceSource Sans 3 19×IBM Plex Mono 13×JetBrains Mono 9.1×
Fonts that go with Source Serif 4: pairs and trios →The pairs sites choose most →
Pair checkerSource Serif 4 + any fontHow many of the 6,276,350 home pages counted load the two together, and how that compares with chance.Check this font with any other09 / Questions
Questions about Source Serif 4
Answered from its licence, Google Fonts and each app’s own font list
Is Source Serif 4 free for commercial use?
Yes. Source Serif 4 is under the SIL Open Font License 1.1 , which allows commercial use at any scale, logos, websites, apps and PDFs included.
How do I download and install Source Serif 4?
FontKind doesn’t host Source Serif 4’s files: it comes free from Google Fonts . On its page there, choose Get font, then Download all, and unzip the file. It holds two variable files, one for the uprights and one for the italics, and a static folder with a file per style: install one set or the other, not both. On Windows or a Mac, double-click each font file and choose Install, then restart any app that was open, Word included.
Is Source Serif 4 in Microsoft Word?
Not until you install it: Source Serif 4 isn’t one of Microsoft 365’s cloud fonts. Installed, it is in Word’s font menu and PowerPoint’s. On Windows, its weights beyond Regular and Bold show as fonts of their own, such as Source Serif 4 ExtraLight and Source Serif 4 Black. For someone who hasn’t installed it, turn on Embed fonts in the file in Word’s save options: its licence allows that.
Is Source Serif 4 in Google Docs?
Most likely. Search for Source Serif 4 under More fonts in the font menu of Docs; added there, it is in Sheets and Slides too.
Is Source Serif 4 in Figma?
Yes: Source Serif 4 is in Figma’s font menu with all eight weights and their italics, in the browser and the desktop app, with nothing to install.
How many weights does Source Serif 4 have?
Source Serif 4 comes in eight weights, from ExtraLight (200) to Black (900), each with an italic. It is a variable font: it takes any weight from 200 to 900 and optical sizes from 8 to 60.
Who designed Source Serif 4?
Source Serif 4 was designed by Frank Grießhammer. It has been on Google Fonts since November 2021.
What fonts are similar to Source Serif 4?
The closest in our letter-by-letter match are Noto Serif Japanese (96), ElstobP (79) and Elstob (77), out of 100. Next to Source Serif 4, Noto Serif Japanese is 10% wider and 19% lighter, with more stroke contrast. See all 100 fonts like Source Serif 4.