Thai font · OFL

Noto Serif Thai

โนโต เซอริฟ ไทย

By Narongsak Chaiwong

Typography & Licensing Specialist, ThaiGraph · April 16, 2026

Information verified as of April 2026

<link href="https://fonts.googleapis.com/css2?family=Noto+Serif+Thai:wght@400;700&display=swap" rel="stylesheet">

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+Thai:wght@400;700&display=swap');

font-family: 'Noto Serif Thai', serif;

What Noto Serif Thai is

Noto Serif Thai is the serif member of Google and Adobe’s Noto family for the Thai script, designed as the editorial and long-form companion to Noto Sans Thai with matched vertical metrics and licensing. It ships as a variable font across nine weights from Thin to Black and is released under the SIL Open Font License.

Serif Thai is a relatively recent construct — Thai script evolved without a Western-style serif tradition — so “Thai serif” usually means a typeface that keeps the traditional loop (หัว) on consonants but adds subtle terminal modulation and stroke contrast borrowed from Latin serif conventions. Noto Serif Thai follows this approach: looped consonants, measured stroke contrast, and generous but not dramatic terminals.

The result is the most technically polished free Thai serif available, which is why it shows up in news archives, academic publishing, and bilingual reference sites.

Character design and tone

Noto Serif Thai keeps the traditional circular loops on consonants like ก, ถ and ภ but modulates stroke weight so thin strokes contrast clearly against thicker verticals, producing a quiet editorial texture on a page of body copy. The contrast is moderate — roughly 1:2 between thin and thick — which matches the Latin Noto Serif.

Terminal shapes on ก and ง are softly rounded rather than cupped, which keeps the face feeling contemporary rather than antique. Vowel marks (สระอี, สระอา) and tone marks are drawn with matching contrast, so the page texture reads uniformly at body sizes.

The Latin companion is Noto Serif, a well-mannered transitional serif in the Times / Source Serif neighbourhood. Cap heights and x-heights align with Noto Sans Thai, so a designer can switch between sans and serif within the same layout without optical jumps.

Weights and availability

Noto Serif Thai ships nine weights from Thin (100) to Black (900) as a variable font, plus static files for each weight. Download from Google Fonts or the Noto GitHub repo.

Italic cuts are not part of the current release for the Thai script — Thai typography does not traditionally use italic as a separate style, so oblique variants are rarely drawn. For emphasis, designers typically reach for a heavier weight rather than an italic. File sizes are around 50-70KB per static weight in WOFF2.

Best use cases

Noto Serif Thai is built for long-form Thai reading: books, long articles, academic content, bilingual editorial. Strong briefs:

• Thai-language news sites and online magazines, especially when paired with English
• Academic journals, university publications, and research papers
• E-book and EPUB body text for Thai novels and non-fiction
• Bilingual reference sites (Wikipedia-style, knowledge bases)
• Government white papers and policy publications that want a more editorial voice than Sarabun

Where it doesn’t fit: UI and product interfaces (sans is almost always better for UI), display and poster work (reach for Charm or Pridi Medium/Bold), and brands where the serif reads as “corporate safe” rather than “considered”.

Pairings

Noto Serif Thai pairs best with its Noto Sans sibling or with other editorial sans-serifs that share its proportions. Three pairings:

• Noto Sans Thai — the intended sibling pairing, matched by design
• Source Sans 3 — Adobe’s humanist sans for headlines above Noto Serif Thai body
• IBM Plex Sans — cleaner corporate sans for captions and UI around serif body

Licensing

Noto Serif Thai is released under the SIL Open Font License and is free for commercial use, modification, and bundling. Verify at the Google Fonts specimen or the Noto GitHub repository. The SIL OFL permits bundling in products and web fonts in commercial sites without attribution in the product itself, though the licence file must travel with the font file.

Information verified as of April 2026