TTF: Browser Support, Features, vs WOFF2

What is TTF?

TTF is a scalable outline font standard that Apple created and Microsoft licensed for Windows. Each glyph is built from straight lines and quadratic Bezier curves, so the font keeps its quality at any size. A .ttf file holds the outlines, hinting tables, and naming data in one binary file.

Which browsers does TTF support?

TTF works in every modern browser through the CSS @font-face rule, including Chrome, Edge, Firefox, Safari on macOS and iOS, Opera, Samsung Internet, and the Android Browser. Internet Explorer 9 to 11 supports TTF only when the font's embedding bits allow it, and IE 5.5 to 8 do not support it at all.

What are the key features of TTF?

TTF offers six features that explain why it became the default font format on Windows and macOS and a baseline option for the web: scalable vector outlines, hinting, a single-file structure, cross-platform reach, a stable MIME type, and a clean fallback path inside CSS.

• Scalable vector outlines: TTF stores each glyph as a series of straight lines and quadratic Bezier curves, so the font scales to any size without quality loss. The same .ttf file works for 10-pixel UI labels and 200-pixel headlines.
• Built-in hinting tables: TTF carries a hinting program that adjusts each glyph at small pixel sizes, so screen text stays sharp and readable. Hinting is what makes TTF look clean at 12 pixels on Windows ClearType.
• Single-file binary structure: A .ttf file holds the outline data, hinting, and naming tables together. Required tables include head, hhea, hmtx, cmap, glyf, loca, maxp, name, and post, all bundled into one container.
• Cross-platform reach: TTF works on Windows, macOS, Linux, iOS, and Android at the operating-system level, so a single file ships to every desktop app, mobile app, and web browser without conversion.
• Standard MIME type and extension: The MIME type is font/ttf and the file extension is .ttf. The CSS @font-face format string is format("truetype").
• Graceful CSS fallback: A browser that prefers a smaller format (WOFF2 or WOFF) skips the TTF entry in the @font-face src list and only fetches the TTF if the better format is missing, so the file never blocks the page.

How do you use TTF fonts with @font-face?

Use the CSS @font-face rule to load a .ttf file from your server and apply it across the page. The pattern below loads a TTF as a fallback after WOFF2, sets a system fallback stack, and avoids invisible text during the font load.

• Host the .ttf file: Upload your TrueType font file to your server, CDN, or static asset bucket. Confirm the file responds with the font/ttf MIME type so browsers do not block the request.
• Declare a @font-face rule: Add a @font-face block to your CSS that points to the .ttf file with src: url("/fonts/MyFont.ttf") format("truetype"). List a WOFF2 entry first so modern browsers pick the smaller file.
• Apply the font-family: Use the new font-family name in your CSS selectors so headings, body text, or specific elements pick up the TTF on every page that loads the stylesheet.
• Set a system fallback stack: Add system fonts after your custom family so visitors still see readable text if the TTF or WOFF2 fails to load on a flaky network.
• Add font-display: swap: Include font-display: swap inside the @font-face rule so the browser shows fallback text right away and swaps to the TTF as soon as it loads.

@font-face {
  font-family: "MyFont";
  src: url("/fonts/MyFont.woff2") format("woff2"),
       url("/fonts/MyFont.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

body {
  font-family: "MyFont", system-ui, -apple-system, sans-serif;
}

If the TTF still does not load, check that the file is served with the font/ttf MIME type and that the CORS headers allow font requests from your site's origin.

What are the known issues with TTF on the web?

TTF works in every modern browser, but it carries real downsides for production web delivery. The format predates the web and never picked up the compression and metadata layers that WOFF and WOFF2 added later.

• Largest file size of any web font format: TTF ships raw font tables with no built-in compression, so files are typically 30 to 80 percent larger than the same font in WOFF2. The gap matters most on mobile networks.
• Internet Explorer support depends on embedding bits: IE 9 to 11 only load a TTF if the font's fsType embedding bits are set to installable. Foundry-licensed fonts often disable that flag, so the font fails silently in IE.
• No built-in compression layer: Browsers fetch TTF as an uncompressed binary, so HTTP gzip on the server is the only compression layer. WOFF2's Brotli wrapper compresses smaller and decodes faster.
• Older Opera and Firefox dropped frames: Opera 9 to 9.6 and Firefox 2 to 3 did not load TTF through @font-face. Sites that target those legacy versions need a separate fallback stack.
• Hinting is platform-specific: TrueType hinting tables target Windows and macOS rasterizers, so the same TTF can render with different stem weights and edge sharpness across operating systems.
• Subsetting tools live outside the format: TTF has no subsetting layer of its own, so authors need fonttools, glyphhanger, or pyftsubset to strip unused glyphs before shipping. WOFF2 supports the same workflow but compresses the result further.
• Modern browsers prefer WOFF2 first: Most browsers download WOFF2 first if it is listed in the @font-face src list. TTF only acts as a legacy fallback for the small slice of traffic on browsers older than Chrome 36 and Firefox 39.

In my experience, the most surprising failure happens with foundry-licensed TTF fonts shipped through @font-face on Internet Explorer. The font loads cleanly in Chrome, Firefox, and Safari, but IE 9 to 11 silently fall back to the system font with no console error. Always confirm the fsType bit before betting on TTF for IE compatibility.

Citations

All TTF version numbers and platform notes in this guide come from these primary sources:

• MDN Web Docs - @font-face: developer.mozilla.org/en-US/docs/Web/CSS/@font-face
• MDN Web Docs - CSS font-display: developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display
• Wikipedia - TrueType: en.wikipedia.org/wiki/TrueType
• Apple Developer - TrueType Reference Manual: developer.apple.com/fonts/TrueType-Reference-Manual
• Microsoft Learn - OpenType specification (TrueType outlines): learn.microsoft.com/en-us/typography/opentype/spec
• Microsoft Learn - fsType embedding flags: learn.microsoft.com/en-us/typography/opentype/spec/os2#fstype
• W3C - CSS Fonts Module Level 4: w3.org/TR/css-fonts-4
• W3C - WOFF2 Recommendation: w3.org/TR/WOFF2
• Mozilla Hacks - Firefox 3.5 web fonts: hacks.mozilla.org/2009/06/beautiful-fonts-with-font-face
• WebKit - CSS3 Web Fonts in Safari: webkit.org/blog/15/css-3-web-fonts