Thai font · COMMERCIAL

Thonburi

ธนบุรี

By Narongsak Chaiwong

Typography & Licensing Specialist, ThaiGraph · July 4, 2026 · Updated September 8, 2026

Information verified as of September 2026

อ่านหน้า ฟอนต์ Thonburi เป็นภาษาไทย — พร้อมลิงก์ดาวน์โหลดและวิธีติดตั้ง →

Thonburi (ธนบุรี) is Apple’s Thai system font on iPhone, iPad and Mac. If you searched because you want it on a Samsung phone or a Windows PC, the answer is in the first section. Its origins, weights, licence, and the other font called Thonburi that really is a free download follow below.

Can you use Thonburi on iPhone, Samsung and Windows?

Only on Apple devices. Thonburi ships inside iOS, iPadOS, macOS, tvOS and watchOS as a system font; Samsung, Android and Windows do not have it, and there is no legitimate way to add it, because section 2.E of Apple’s Software License Agreement permits the bundled fonts to be used only “while running the Apple Software”. In one table:

On iPhone and iPad

Thonburi is already working out of the box; there is nothing to download. Apple’s System Fonts list records Thonburi, Thonburi Bold and Thonburi Light at version 18.0d1e1 tagged “iOS system font”, “macOS system font”, “tvOS system font” and “watchOS system font”. It is the face the system picks for Thai characters in menus, Messages and every app. If your iPhone displays Thai, you are reading Thonburi — on iOS 16, 17 or the current release.

What iOS does not offer is a system-wide font switch. The only route Apple documents in the iPhone User Guide is installing fonts from an App Store app to “use them in documents you create on iPhone”, managed under Settings → General → Fonts. Fonts added that way work in document apps; they do not restyle the interface.

The name “SF Thonburi” that many people search for is not an official one. In Apple’s documentation the font is simply Thonburi; SF (San Francisco) is the Latin family shown beside it on the same screen, and the Apple Developer Fonts page offers no Thai SF for download. More in “What Thai font does iPhone use?” below.

On Mac

Every Mac has all three Thonburi weights in Font Book. Apple’s Fonts included with macOS Sonoma lists Thonburi, Thonburi Bold and Thonburi Light 18.0d1e1 and notes that “most of these fonts are installed and enabled automatically”; fonts in the System Library folder “are required by your Mac and can’t be disabled in Font Book”.

The scope of use is set by licence section 2.E: “you may use the fonts included with the Apple Software to display and print content while running the Apple Software; however, you may only embed fonts in content if that is permitted by the embedding restrictions accompanying the font in question”. Display and print on the Mac: yes. Embedding in a PDF: as far as the permission shown in Font Book → Show Font Info allows. Copying the file to another machine: outside the licence.

On Samsung and Android

Android does not include Thonburi and there is no legitimate way to add it. Android’s default Thai face is Noto Sans Thai — the Android Open Source Project’s system font configuration maps the Thai script family (lang="und-Thai") to NotoSansThai-Regular and NotoSansThai-Bold, a loopless design. That is why Thai text on Android and iPhone feels different.

On Samsung, the one supported way to change the system font, per Samsung’s own guide, is Settings → Display → Font size and style → Font style → Download fonts, which opens the Galaxy Store. Samsung documents no step for installing your own font file, so the viral “change your Samsung font to SF Thonburi” videos depend on third-party font apps plus files extracted from iOS or macOS, which breaches Apple’s section 2.E. We do not recommend or link to them. If you want looped Thai on a Samsung, look at the Thai fonts in the Galaxy Store, or use the free font in the next section wherever you control the typography — websites and apps that accept font files.

On Windows

Windows does not have Thonburi — it is in neither the default install nor the optional Thai Supplemental Fonts feature. Per Microsoft’s Windows 11 font list, the Thai font that ships with the system is Leelawadee UI (Leelawui.ttf 5.05, with Semilight and Bold), also a looped design. Leelawadee, Cordia New, Angsana New and eleven UPC families sit in an optional feature you enable yourself: right-click Start → Settings → System → Optional features → View features, tick Thai Supplemental Fonts → Next → Add, per Microsoft’s documentation (on some Windows 11 builds the pane is under Settings → Apps; the shortcut is Run → ms-settings:optionalfeatures).

If you want the Thonburi feel on Windows, do not hunt for a Thonburi.ttf — install the free font below.

The free font that installs everywhere: Noto Sans Thai Looped and Sarabun

The properly licensed substitute that installs on Windows, Mac, iPhone and Android alike is Noto Sans Thai Looped — a looped Thai family in nine weights under the SIL Open Font License, free from Google Fonts. The second choice is Sarabun (OFL, eight weights, Google Fonts), which Apple itself lists in its System Fonts table as “iOS downloadable” and “macOS downloadable” — on a Mac you can fetch it through Font Book without leaving Apple’s ecosystem.

How to install:

• Windows — download from Google Fonts, right-click the .zip → Extract, then right-click the font files → Install, per Microsoft’s guide
• Mac — double-click the font file in Finder and click Install, per Apple’s Font Book guide; or search Font Book for Sarabun and download it straight from Apple
• iPhone / iPad — install through a font-manager app from the App Store, then check Settings → General → Fonts; usable in document apps (the system font stays)
• Android / Samsung — use it in apps that accept font files, and embed it on the web with @font-face with full OFL rights; the system-wide font still has to come from the Galaxy Store

Other free Thai fonts with a similar feel are listed under “Getting the iPhone Thai look on Windows or Android” below.

What Thonburi is

Thonburi is Apple’s looped Thai system sans, bundled with Mac OS X since 10.3 Panther (2003, B.E. 2546) and used as the Thai system font on iPhone and iPad. According to the ThaiFaces specimen, it is credited to Apple (Singapore), ships in three weights, and covers the full Thai consonant, vowel, tone-mark and numeral set plus the Latin alphabet.

One disambiguation before going further: in Thai, ฟอนต์ธนบุรี points at two completely different typefaces. The next section sorts out which is which.

The name follows Apple’s convention of christening its bundled Thai fonts after Bangkok places and districts — Krungthep, Ayuthaya, Sathu, Silom and Sukhumvit Set are its siblings, as catalogued in Jeff McNeill’s Thai font collection. ธนบุรี (Thonburi) itself is the historic west-bank district across the Chao Phraya from Bangkok, and a former Thai capital.

Its lineage predates its Mac OS X debut: the metadata of Thonburi Bold (version 13.0d1e1) reads “Copyright 1992-2011 by Apple Inc.”, tracing the typeface back to Apple’s early-1990s Thai language support. One caveat the record forces on us: Thai foundry PSL SmartLetter markets itself as “The Font Company that sold to Apple”, but no public source connects Thonburi to PSL, so the often-repeated PSL origin story remains unverified. No named human designer is documented — only the corporate Apple (Singapore) credit.

Two different fonts are called Thonburi

In Thai search results, ฟอนต์ธนบุรี can mean either Apple’s system font, which cannot be downloaded, or a display typeface called SOV_ThonBuri, which is a free download from f0nt.com. They are unrelated:

If you arrived here after noticing the Thai text on an iPhone, you want Apple’s Thonburi. If you are hunting for the old Thonburi shophouse-signage lettering to use in design work, you want uvSOV’s SOV_ThonBuri, whose release page on f0nt.com states it was drawn from old signage at Wat Nang and files it under display / traditional / signage.

On licensing for SOV_ThonBuri: the f0nt.com licence page states that fonts on the site can be downloaded free and used in commercial design work, unless the individual designer sets different terms; the font files themselves may not be redistributed, and distributing a modified version needs the designer’s permission. Always re-read the terms on the specific release page before client work — the same principle we set out in our Thai font licensing guide.

Can you download Apple’s Thonburi?

No. Apple’s Thonburi is not sold, not distributed, and not on Google Fonts or any CDN. The right to use it travels with macOS and iOS under Apple’s Software License Agreement. If you design on a Mac, it is already in your font menu. If you do not, there is no legal way to obtain it on its own.

Thonburi files floating around general font-download sites have been extracted from the operating system, which breaches Apple’s licence. Using them in client work, print, or as an embedded webfont carries real legal exposure, and we do not recommend it.

The correct move is a free looped Thai font that actually carries distribution rights. The full list is in our free Thai fonts category.

What Thai font does iPhone use?

The Thai text you see in menus, Messages and apps across iPhone, iPad and Mac is Thonburi, a looped face; English text on the same devices uses the San Francisco family (SF Pro). The two scripts come from different typefaces, not one unified family.

Apple publishes some of its system fonts for free download on the Apple Developer Fonts page, but the list is SF Pro, SF Compact, SF Mono, New York, and four script extensions — SF Arabic, SF Armenian, SF Georgian and SF Hebrew. There is no Thai script extension of San Francisco offered for download. Apple’s Thai type stays inside the operating system.

How much Thonburi matters to Thai users became obvious in 2013, when the iOS 7 beta swapped the Thai system font from Thonburi to Sukhumvit, the loopless face designed by Cadson Demak. The backlash was strong enough that Apple reverted to Thonburi in iOS 7.0.1 — an episode Typotheque’s history of Thai typography records in detail, and one that Wikipedia’s Thai typography article treats as a landmark in the looped-versus-loopless debate.

Getting the iPhone Thai look on Windows or Android

You cannot do it legally with Apple’s file, but several free, properly licensed looped Thai fonts read almost the same. Four that actually substitute:

• Noto Sans Thai Looped — Google’s looped Thai under the OFL, nine weights, the closest thing to a neutral system face and embeddable on the web
• Sarabun — the open-licensed looped Thai workhorse in eight weights, good for both UI and documents
• TH Sarabun PSK — the Thai government document standard, free, installs on Windows and macOS
• Leelawadee — the looped Thai bundled with Windows, Microsoft’s counterpart to Thonburi

A note on the other direction: guides circulate for modifying Android or Samsung devices to install Apple’s Thai font files. That requires copying Apple’s licensed software, so it is not a legitimate route and we do not recommend it.

Character design and tone

Thonburi is a looped (มีหัว) Thai sans: every consonant that traditionally carries a loop keeps it, which is exactly why Thai users defended it so fiercely in 2013. The loops are what let a Thai reader separate consonants fastest at small sizes.

Because it was drawn as an interface font, the design priorities are legibility ones: open loops that survive small pixel sizes, clearly differentiated lookalike pairs, and tone marks that stay distinct at UI text sizes. The Latin companion is a plain humanist sans built to sit quietly next to the Thai, not to star on its own.

The overall tone is neutral civic infrastructure — Thonburi is the Thai text most iPhone and Mac users have read every day for two decades, which makes it feel less like a designed voice and more like the default voice of the platform. For the Windows-side equivalent of that default, see Cordia New.

Weights and availability

Thonburi ships in three weights — Light, Regular and Bold — bundled with Mac OS X 10.3 Panther and later, per the ThaiFaces specimen. It arrives with the operating system; there is nothing to install and nothing to buy separately.

There is no italic, no variable axis, and no webfont distribution. Any brief that needs more range — a headline heavier than Bold, or a Thin for large numerals — has to start from a different family rather than mixing with Thonburi. Browse our full Thai font library for fonts you can actually self-host.

Best use cases

Thonburi is the right choice when you are designing for Apple platforms and want the native looped Thai reading experience users already trust. Strong briefs:

• Native iOS and macOS app interfaces rendering Thai text with the system stack
• UI mockups and prototypes that must match what Thai users actually see on Apple devices
• Keynote and Pages documents produced and shared inside the Apple ecosystem
• Design QA — checking how Thai copy will really render on iPhones without custom fonts

Where it doesn’t fit: websites and cross-platform products (you cannot embed it), print identity work (no extended weights, no licence path), and any project that needs distribution rights.

Pairings

Thonburi pairs most naturally with fonts from its own Apple habitat or with open looped Thai text faces. Three pairings:

• Sukhumvit Set — Apple’s bundled loopless sibling; the two cover the looped/loopless register within one system, and their 2013 role swap is part of Thai type history
• Sarabun — the open-licensed looped Thai workhorse, the natural stand-in wherever Thonburi’s reading feel is wanted but embedding rights are needed
• Prompt — an open loopless geometric sans for display hierarchy above Thonburi body text in Apple-platform mockups

Licensing

Thonburi is proprietary Apple software, licensed to you only as part of macOS and iOS under Apple’s Software License Agreement. As the ThaiFaces specimen puts it, it is free to use for system owners — but that permission travels with the operating system, not with the font file. You may not extract, redistribute, or serve it as a webfont. The operative wording is section 2.E of the agreement: the fonts may be used “to display and print content while running the Apple Software”, and embedded in content only as far as the font’s own embedding permission allows.

For projects that need distributable Thai fonts, the free alternatives are strong: Noto Sans Thai Looped and Sarabun for looped sans under an open licence, TH Sarabun PSK for Thai government documents, and Prompt for a modern loopless voice — all self-hostable without a licence conversation.

Frequently asked questions about Thonburi

The questions people searching for Thonburi ask most are platform questions — whether a Samsung can switch to it, whether an iPhone needs to download it, and what “SF Thonburi” is — and the short, sourced answers are below.

Can I change my Samsung font to Thonburi?

Not legitimately. Samsung’s guide changes the system font only through the Galaxy Store (Settings → Display → Font size and style → Font style → Download fonts), and Thonburi is not there, because Apple has never licensed anyone to distribute it. The methods in circulating videos rely on files extracted from Apple’s systems, which breaches licence section 2.E. For the same looped forms in work you control, use Noto Sans Thai Looped.

Do I need to download Thonburi on iPhone?

No. Thonburi is an iOS system font per Apple’s System Fonts list; the system applies it to Thai text everywhere, from the Home Screen to Messages. What iOS lets you add, per Apple’s guide, are fonts for use in documents, installed through App Store apps and managed under Settings → General → Fonts.

What is “SF Thonburi”?

A user-coined name, not an official one. Apple’s documentation calls its Thai system font Thonburi; SF Pro is the Latin face shown alongside it on iPhone and Mac, so people run the two together as “SF Thonburi”. The Apple Developer Fonts page offers SF for Latin, Arabic, Armenian, Georgian and Hebrew only — nothing for Thai.

Can I download Thonburi for Windows?

No. Thonburi is absent from Microsoft’s Windows 11 font list, and the files on free-font sites were extracted from macOS. The looped Thai fonts Windows already has are Leelawadee UI and Leelawadee (the latter after enabling Thai Supplemental Fonts). For one font that looks identical on Windows and Mac, install Sarabun or Noto Sans Thai Looped from Google Fonts.

Information verified as of September 2026