Thai font · OFL

Prompt

พร้อม

By Narongsak Chaiwong

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

Information verified as of August 2026

อ่านหน้า ฟอนต์ Prompt เป็นภาษาไทย — พร้อมลิงก์ดาวน์โหลดและวิธีติดตั้ง →

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

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

font-family: 'Prompt', sans-serif;

What Prompt is

Prompt is a loopless Thai typeface paired with a geometric Latin sans-serif, designed by Cadson Demak and released free on Google Fonts under the SIL Open Font License in nine weights with matching italics — 18 styles in total. It covers Thai, Latin, Latin Extended and Vietnamese.

The name comes from the Thai word พร้อม, which means “ready” — the same sense as the English word, as the foundry notes in the description shipped with the font on Google Fonts. ThaiFaces records the publication year as B.E. 2558 (2015 CE); Google Fonts added the family to its catalogue on 20 June 2016, per the METADATA.pb entry.

The design objective is stated plainly in the project brief: a formal loopless Thai and sans Latin typeface drawing on Avenir and the early modernist era. The result works as body text and holds up as a display face at larger sizes.

Where to download Prompt free

Prompt is a free download straight from Google Fonts — no registration, no payment, and no paid tier to upgrade to. Three legitimate routes:

1. Google Fonts ZIP — open the Prompt specimen, click “Get font”, and download the ZIP containing all 18 .ttf files. Unzip and install per your operating system.
2. CSS embed — add https://fonts.googleapis.com/css2?family=Prompt:ital,wght@0,100..900;1,100..900&display=swap in a <link> tag, then declare font-family: 'Prompt', sans-serif;. Nothing to host yourself.
3. GitHub source — the cadsondemak/prompt repository holds the original .ttf and .otf files under OFL-1.1, for self-hosting or modification.

To see how your own copy sets before you commit, run it through our Thai font tester.

One caution: third-party font aggregators sometimes redistribute older or altered builds of Prompt that are missing weights or mishandle Thai tone-mark positioning. Stick to Google Fonts or the Cadson Demak repository.

Is Prompt free for commercial use?

Yes. Prompt is released under the SIL Open Font License, which permits use, copying, embedding, modification and redistribution at no cost, including in commercial work. There is no paid licence tier — the full 18-style family is free.

What the OFL allows:

• Client work, logos, packaging, signage and commercial advertising
• Webfont embedding, and bundling inside apps and e-books
• Modifying the font files and redistributing derivatives under the same OFL

What it does not allow: selling the font files on their own as a product, and using the original Reserved Font Name on your modified version. Our Thai font licensing guide covers the practical detail.

The nine weights, and where Prompt Bold sits

Prompt ships nine weights from Thin (100) to Black (900), each with a matching italic, for 18 files in total — Prompt Bold is weight 700, not the heaviest cut in the family. The full list is confirmed by the METADATA.pb file in the google/fonts repository:

If you reached for Bold because you wanted more punch in a headline, skip to ExtraBold (800) or Black (900) — both are in the same download, nothing extra to fetch. In CSS, use font-weight: 700 for Bold and font-weight: 900 for Black.

Prompt has no variable build, no condensed cut and no looped variant. For web deployment, a three-weight loadout (Regular, Medium, Bold) covers most UI needs at under 200KB in WOFF2.

Prompt versus Kanit

Both are loopless Thai sans families from Cadson Demak with nine weights each, but Kanit is strictly geometric and leans industrial, while Prompt rounds the corners and opens up the counters. The choice is about brand temperature, not technical capability.

• Choose Prompt when the brand wants modernity that stays approachable — cafés, boutique hotels, wellness, independent e-commerce
• Choose Kanit for a harder, more assertive voice — sports, automotive, technology, heavy promotional work
• Choose Mitr for humanist warmth, accepting six weights and no italics
• Choose K2D or Bai Jamjuree for a loopless voice that has not yet been used everywhere

Browse the whole field in our loopless Thai fonts category.

Character design and tone

Prompt uses a high x-height, soft circular curves, and short stems relative to its cap height, producing a rounder silhouette than other Cadson Demak loopless faces. The head of ก is a gentle open hook that leans slightly inward, giving a softer profile than Kanit’s more rigid opening.

Apertures on ถ, ภ and ร are open and wide, which keeps the face readable at small sizes despite the loopless construction. Stroke weight is essentially monolinear with subtle optical correction at joins. The official description notes that particular attention went into the size and position of Thai vowel signs and tone marks, and it shows: ไม้เอก above a Thin weight still reads at 10pt.

That same description carries a warning worth repeating: loopless construction makes certain Thai consonant pairs look alike, which can cause confusion in short strings such as labels and buttons. This is a property of loopless Thai in general, not a defect specific to Prompt — the background is in our piece on the loopless revolution.

The Latin companion is a geometric sans with rounded terminals on s, c and e. Numerals are lining and full-height. Compared with Kanit’s Latin, Prompt’s sits closer to Avenir, which the brief names outright as the reference.

Best use cases

Prompt works hardest on consumer brands that want warmth and modernity in one typeface, and it is one of the few free Thai families with a genuine italic at every weight. Strong fits:

• Boutique hotel and hospitality branding — signage, collateral, web
• Wellness, spa and beauty brands where geometric-with-softness reads as premium
• Independent F&B packaging, particularly specialty coffee and craft beverage
• Thai-English editorial work that needs real italics rather than a software slant
• Mobile-first Thai e-commerce where friendly UI type outperforms corporate sans

Where it does not fit: Thai government documents, where regulation still expects a looped face such as Sarabun, and technical Thai typography meant to sit beside IBM Plex, where Anuphan is the better match.

Pairings

Prompt pairs best with Latin sans-serifs that share its soft geometric bones, and with a looped Thai face when you want contrast between headline and body. Three strong pairings:

• Poppins — a near-sibling geometric Latin, ideal for Thai-English headline and subhead pairing
• Sarabun — looped Thai for long-form body text while Prompt handles headlines
• Noto Sans Thai — a neutral fallback with wider character coverage for multilingual copy

Full bilingual pairing logic is in our Thai-Latin pairing guide.

Licensing

Prompt is released under the SIL Open Font License and is free for commercial use, modification, and bundling provided the original copyright and OFL notice stay with the files. Verify at the Google Fonts page or the Cadson Demak source repository, which states OFL-1.1.

To compare before committing, browse our full Thai font library or narrow to loopless Thai fonts.

Information verified as of August 2026