Thai font · COMMERCIAL

DilleniaUPC

ดิลเลเนีย ยูพีซี

By Narongsak Chaiwong

Typography & Licensing Specialist, ThaiGraph · July 16, 2026 · Updated August 5, 2026

Information verified as of August 2026

อ่านหน้า ฟอนต์ DilleniaUPC เป็นภาษาไทย — พร้อมลิงก์ดาวน์โหลดและวิธีติดตั้ง →

What DilleniaUPC is

DilleniaUPC is a looped Thai serif designed by Unity Progress and licensed to Microsoft, bundled with Windows and Office in four styles — Regular, Bold, Italic and Bold Italic — covering both the Thai and Latin scripts. Microsoft records the embedded copyright line as ”© 1992 Unity Progress. Portions © 2004 The Monotype Corporation. Portions © 2015 Microsoft Corporation.” (Microsoft Learn, accessed 5 August 2026).

Most people search for it closed up as “dilleniaupc”; some write “dillenia upc” as two words. Both mean this font — the registered menu name is DilleniaUPC, written closed up.

For most Thai computer users DilleniaUPC is not a font they chose but one they inherited: it arrived with the operating system and was quietly set as a default in older documents. That makes it a compatibility face first and a design choice second — if a legacy Thai document “just renders correctly”, a UPC-family font is often why.

Where to download DilleniaUPC

DilleniaUPC is not available as a separate download. It ships bundled with Microsoft Windows and Office, so the correct route is to enable the Thai Supplemental Fonts feature on your own machine — not to grab a .ttf from a font-aggregator site (Microsoft — Cloud fonts in Office, accessed 16 July 2026).

Microsoft moved this group of fonts out of the default install and into optional features to reduce the operating system footprint, improve performance and optimize disk space. The consequence is that a machine freshly installed or upgraded from an older Windows version often does not have DilleniaUPC at all (Microsoft Learn, accessed 5 August 2026).

How to add DilleniaUPC on Windows 11 and Windows 10

1. Right-click Start, choose Run, type ms-settings:optionalfeatures and click OK (or go to Settings → System → Optional features)
2. Click View features next to “Add an optional feature”
3. Find and tick Thai Supplemental Fonts
4. Click Next, then Add — the machine must be online, because Windows Update is what downloads the font package

Thai Supplemental Fonts installs DilleniaUPC along with the rest of the Microsoft Thai system set: AngsanaUPC, Angsana New, BrowalliaUPC, Browallia New, CordiaUPC, Cordia New, EucrosiaUPC, FreesiaUPC, IrisUPC, JasmineUPC, KodchiangUPC, LilyUPC and Leelawadee (Windows 11 font list, accessed 5 August 2026).

The alternative is to add Thai as a system language under Settings → Time & language → Language & region → Add a language, which pulls the same font package. At deployment scale this is the capability Language.Fonts.Thai~~~und-THAI~0.0.1.0, which administrators add with DISM (Microsoft Learn — Language FOD, accessed 5 August 2026).

How to check whether you already have it

Open the font menu in Microsoft Word and type “Dillenia”, or open C:\Windows\Fonts and look for these four files:

What about macOS and Linux?

DilleniaUPC is not bundled with macOS or Linux, and there is no legitimate free download. Two options: install Microsoft Office on that machine, where the font arrives with the suite, or switch to one of the free Thai faces listed further down this page. The copies distributed on international aggregator sites are not authorised by Microsoft, and are usually older than version 5.05 with incomplete glyph coverage.

The four DilleniaUPC styles

DilleniaUPC ships four styles only — Regular, Italic, Bold and Bold Italic. There is no Light, Medium or Black weight, and no variable version (Microsoft Learn, accessed 5 August 2026).

That limit matters when planning a type system: if the work needs more than two levels of hierarchy (regular and bold), the UPC families cannot deliver it alone — you either mix in another family or move to a modern family with a full weight range.

The font covers Thai and Latin, with Microsoft recording the script tags as dlng:'Thai' and slng:'Thai', 'Latn', plus code pages 874 Thai and 1252 Latin 1. Mixed Thai–English lines in office documents can therefore be set from a single family.

DilleniaUPC, the UPC family, and the “New” question

DilleniaUPC is one of Microsoft’s Thai system faces named after flowers and Thai words, and among all the UPC families only Angsana, Browallia and Cordia have “New” counterparts — there is no “Dillenia New” in the Windows font list (Windows 11 font list, accessed 5 August 2026).

The difference between the UPC and New cuts is that the New versions adjust spacing and metrics for modern line layout, while the UPC versions preserve the original metrics so old documents open without reflowing. Because Dillenia has no New counterpart, DilleniaUPC is the only version of this design in the system.

Neighbouring families that get swapped for it in Thai office documents:

• AngsanaUPC and Angsana New — the Thai serif most often seen in government paperwork
• CordiaUPC — the sans counterpart to Angsana, used for headings and tables
• EucrosiaUPC and JasmineUPC — Thai serifs with wider skeletons than Dillenia
• KodchiangUPC — a book-toned Thai serif for sustained reading
• LilyUPC, IrisUPC and FreesiaUPC — the remaining members of the same set

Character and best use cases

DilleniaUPC is a looped (มีหัว) Thai typeface with modulated serif strokes, drawn for continuous body text in 1990s office documents rather than for brand work. It sits in the traditional Thai text category rather than the modern loopless movement covered in our typography guide.

Strong fits:

• Opening, editing and reprinting older Thai documents that specified a UPC family in the file
• Government, academic and office files that must render line-for-line identically to the original
• Environments standardised on Microsoft Thai system fonts, where files move between machines
• Cases needing a widely-installed Thai serif at no extra cost to the user

Where it doesn’t fit: new brand identity work, websites (which need a separate webfont licence), and anything needing more than two weights.

Free Thai fonts that replace DilleniaUPC

If the machine doesn’t have DilleniaUPC and you would rather not touch optional features, the licensed-and-free route is an openly published Thai face that installs on any operating system and can be used commercially. Four that cover the same body-text role:

• TH Sarabun New — the national font Thai government agencies mandate for official correspondence. If the goal is Thai official paperwork, this is the face to standardise on, not DilleniaUPC
• Kinnari — a looped Thai serif from the TLWG free font project, free to use and to redistribute, with a register close to the system fonts of the same era
• Norasi — a looped Thai serif from the National Font Project, suited to long body text in print
• Noto Serif Thai — a modern Thai serif with nine weights under the OFL, for when the brief needs more than two levels of hierarchy

One caution: swapping fonts in an existing document shifts line counts and page breaks, because character widths differ. If the file has to go to another organisation for review, enable Thai Supplemental Fonts using the steps above rather than changing the font. More options in the serif category.

Licensing

DilleniaUPC is a commercial font owned by Unity Progress and licensed through Microsoft. Your right to use it comes with your licensed copy of Windows or Office, and it cannot be redistributed or hosted as a webfont without a separate Microsoft licence. Microsoft directs anyone needing rights for enterprises, web developers, hardware or software redistribution, or server installations to its font licensing channel (Microsoft Learn, accessed 5 August 2026).

In plain terms: setting documents on a machine with licensed Windows or Office is fine, but do not upload the .ttf to a web server, do not embed it in a distributed app or product, and do not pass font files to other people. See our Thai font licensing guide for how bundled system fonts differ from OFL and free faces.

Information verified as of August 2026