IBM Plex Serif

Thin

Italic

100

Extra-Light

Italic

200

Light

Italic

300

Regular

Italic

400

Text

Italic

450

Medium

Italic

500

Semi-Bold

Italic

600

Bold

Italic

700

Characters

Aa
Bb
Cc
Dd
Ee
Ff
Gg
Hh
Ii
Jj
Kk
Ll
Mm
Nn
Oo
Pp
Qq
Rr
Ss
Tt
Uu
Vv
Ww
Xx
Yy
Zz
Åå
Ææ
Çç
Éé
Øø
Ññ
Üü
Žž
1234567890
‘¿?’
“!”
- – —
(&)
[*]
{@}
€£¥$¢
:;,.
<>+÷×=

IBM Plex Serif was born to complete a philosophical equation: to prove that the engineered spirit of the machine could honor the ancient, literary lineage of the serif without retreating into antiquarian nostalgia. Conceived under the creative direction of Mike Abbink alongside the Dutch foundry Bold Monday, the face was designed not merely to accompany its unserifed sibling, but to provide IBM with an authentic voice for long-form editorial scholarship, technical white papers, and historical reflection. In drafting its outlines, the designers turned their gaze toward the transitional and Scotch Roman types of the nineteenth century—and, closer to home, the proud mechanical ancestry of the IBM Selectric typewriter elements that once set the typographic tone of corporate America. Released freely under the SIL Open Font License, it transforms what could have been an insular corporate asset into a generous civic utility for the digital commons.

The anatomy of the face is shaped by a deliberate tension between geometric precision and organic gesture. Unlike traditional book serifs that conceal their construction beneath seamless, calligraphic bracketing, Plex Serif celebrates its seams. Serifs are drawn with flat, architectural footings and crisp triangular brackets, while inner corners reveal the family’s signature chamfers—subtle 45-degree cuts that evoke the disciplined punch of a steel type-slug and the polygonal grid of digital coordinates. Yet Abbink and Bold Monday prevented the design from turning into a brutalist exercise: the drop terminals on the a, c, and r are round and generous, apertures remain open to invite light into the line, and the stroke modulation provides a warm, rhythmic cadence. Along the running measure, it casts a crisp, authoritative grey that holds its structure with unwavering discipline against both high-resolution offset printing and the back-lit glare of mobile screens.

Typographically, the family refuses to treat the serif as a decorative flourish pasted onto an unserifed skeleton; it is a fully realized, scholarly workhorse. Its true cursive italic departs boldly from the upright roman, tilting forward with a dynamic, calligraphic ductus and fluid exits that lend genuine vocal counterpoint to citations and internal dialogue. Equipped with eight carefully graded weights, true small capitals, fractions, and lining, oldstyle, and tabular figures, Plex Serif possesses the complete, courteous apparatus required of modern publishing. It stands within the open commons as a triumph of industrial humanism: an alphabet that acknowledges the punch card, the mainframe, and the typewriter ball, while steadfastly serving the quiet, timeless act of reading.

Words

Questography

difficult waffles

Havana Plywood

Château d’Yquem

Högertrafikomläggningen

hamburgevontpids

Headlines

Thin · 100

Brawny gods just flocked up to quiz and vex him

Thin Italic · 100

Brawny gods just flocked up to quiz and vex him

Extra-Light · 200

Amazingly few discotheques provide jukeboxes

Extra-Light Italic · 200

Amazingly few discotheques provide jukeboxes

Light · 300

Why shouldn’t a quixotic Kazakh vampire jog barefoot?

Light Italic · 300

Why shouldn’t a quixotic Kazakh vampire jog barefoot?

Regular · 400

Grumpy wizards make a toxic brew for the jovial queen

Regular Italic · 400

Grumpy wizards make a toxic brew for the jovial queen

Text · 450

Jackie will budget for the most expensive zoology equipment

Text Italic · 450

Jackie will budget for the most expensive zoology equipment

Medium · 500

Monsieur Jack, vous dactylographiez bien mieux que votre ami Wolf

Medium Italic · 500

Monsieur Jack, vous dactylographiez bien mieux que votre ami Wolf

Semi-Bold · 600

Jeg begynte å fortære en sandwich mens jeg kjørte taxi på vei til quiz

Semi-Bold Italic · 600

Jeg begynte å fortære en sandwich mens jeg kjørte taxi på vei til quiz

Bold · 700

Victor jagt zwölf Boxkämpfer quer über den großen Sylter Deich

Bold Italic · 700

Victor jagt zwölf Boxkämpfer quer über den großen Sylter Deich

Paragraphs

With matted beard, and swathed in a bristling shark-skin apron, about mid-day, Perth was standing between his forge and anvil, the latter placed upon an iron-wood log, with one hand holding a pike-head in the coals, and with the other at his forge’s lungs, when Captain Ahab came along, carrying in his hand a small rusty-looking leathern bag. While yet a little distance from the forge, moody Ahab paused; till at last, Perth, withdrawing his iron from the fire, began hammering it upon the anvil—the red mass sending off the sparks in thick hovering flights, some of which flew close to Ahab. “Are these thy Mother Carey’s chickens, Perth? they are always flying in thy wake; birds of good omen, too, but not to all;—look here, they burn; but thou—thou liv’st among them without a scorch.” “Because I am scorched all over, Captain Ahab,” answered Perth, resting for a moment on his hammer; “I am past scorching; not easily can’st thou scorch a scar.” “Well, well; no more. Thy shrunk voice sounds too calmly, sanely woeful to me. In no Paradise myself, I am impatient of all misery in others that is not mad. Thou should’st go mad, blacksmith; say, why dost thou not go mad? How can’st thou endure without being mad? Do the heavens yet hate thee, that thou can’st not go mad?—What wert thou making there?”

With matted beard, and swathed in a bristling shark-skin apron, about mid-day, Perth was standing between his forge and anvil, the latter placed upon an iron-wood log, with one hand holding a pike-head in the coals, and with the other at his forge’s lungs, when Captain Ahab came along, carrying in his hand a small rusty-looking leathern bag. While yet a little distance from the forge, moody Ahab paused; till at last, Perth, withdrawing his iron from the fire, began hammering it upon the anvil—the red mass sending off the sparks in thick hovering flights, some of which flew close to Ahab. “Are these thy Mother Carey’s chickens, Perth? they are always flying in thy wake; birds of good omen, too, but not to all;—look here, they burn; but thou—thou liv’st among them without a scorch.” “Because I am scorched all over, Captain Ahab,” answered Perth, resting for a moment on his hammer; “I am past scorching; not easily can’st thou scorch a scar.” “Well, well; no more. Thy shrunk voice sounds too calmly, sanely woeful to me. In no Paradise myself, I am impatient of all misery in others that is not mad. Thou should’st go mad, blacksmith; say, why dost thou not go mad? How can’st thou endure without being mad? Do the heavens yet hate thee, that thou can’st not go mad?—What wert thou making there?”

With matted beard, and swathed in a bristling shark-skin apron, about mid-day, Perth was standing between his forge and anvil, the latter placed upon an iron-wood log, with one hand holding a pike-head in the coals, and with the other at his forge’s lungs, when Captain Ahab came along, carrying in his hand a small rusty-looking leathern bag. While yet a little distance from the forge, moody Ahab paused; till at last, Perth, withdrawing his iron from the fire, began hammering it upon the anvil—the red mass sending off the sparks in thick hovering flights, some of which flew close to Ahab. “Are these thy Mother Carey’s chickens, Perth? they are always flying in thy wake; birds of good omen, too, but not to all;—look here, they burn; but thou—thou liv’st among them without a scorch.” “Because I am scorched all over, Captain Ahab,” answered Perth, resting for a moment on his hammer; “I am past scorching; not easily can’st thou scorch a scar.” “Well, well; no more. Thy shrunk voice sounds too calmly, sanely woeful to me. In no Paradise myself, I am impatient of all misery in others that is not mad. Thou should’st go mad, blacksmith; say, why dost thou not go mad? How can’st thou endure without being mad? Do the heavens yet hate thee, that thou can’st not go mad?—What wert thou making there?”

Stylistic sets
Size128

Standard Ligatures

font-feature-settings: 'liga';

fifi
flfl

Figures

1234567890

Tabular Lining (default)

1234567890

Tabular Oldstyle: 'onum'

1/2 3/4

Fractions: 'frac'

0

Slashed Zero: 'zero'

H123

Numerators: 'numr'

H123

Denominators: 'dnom'

H123

Subscripts: 'subs'

H123

Scientific Inferiors: 'sinf'

H123

Superscripts: 'sups'

Ordinals

font-feature-settings: 'ordn';

3a3a
4o4o

Stylistic Sets

font-feature-settings: 'ss--';

aa

'ss01'

gg

'ss02'

00

'ss03'

00

'ss04'

ßß

'ss05'

ѝѝ

'ss06'

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