How to Convert TTF to WOFF2 — Your Options Explained

WOFF2 is the most efficient web font format available. It uses Brotli compression — the same algorithm browsers use for HTTP responses — and typically shaves 20–30% off an already-compressed WOFF file. Most modern browsers support WOFF2 natively, which is why it's the preferred format for web font delivery today.

The challenge: generating WOFF2 files requires Brotli encoding, which is more complex than the simple zlib compression WOFF uses. Browser-based converters that produce WOFF2 are less common as a result.

The WildandFree Font Converter handles TTF, OTF, and WOFF conversions. For WOFF2 specifically, the standard tool is fonttools — a free, offline Python library. This guide covers both paths.

Why WOFF2 Is Worth the Extra Step

The web font format progression looks like this:

• TTF/OTF — desktop formats. Large files (50–300KB typical). Used in CSS for compatibility only.
• WOFF — compressed with zlib. Typically 40–60% smaller than the equivalent TTF. Supported everywhere.
• WOFF2 — compressed with Brotli. Typically 20–30% smaller than WOFF. Supported in all modern browsers (Chrome 36+, Firefox 39+, Safari 10+, Edge 14+).

For a project serving millions of page views, the WOFF2 reduction meaningfully impacts load times. For a small site, WOFF is fine and skips the conversion complexity.

If you need both formats for maximum compatibility, the standard pattern is:

@font-face {
  font-family: 'MyFont';
  src: url('font.woff2') format('woff2'),
       url('font.woff')  format('woff');
}

Browsers take the first format they support. Modern browsers use WOFF2; older ones fall back to WOFF.

Step 1: Convert Your Font to WOFF in the Browser

If you're starting from a TTF or OTF file and need WOFF first, the font converter handles this directly in your browser. No upload, no install:

1. Drop your TTF or OTF file onto the converter
2. Select WOFF as the output format
3. Download the converted file

If you only need WOFF (not WOFF2), you're done. If you need WOFF2 as well, continue to the next step.

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Step 2: Convert to WOFF2 Using fonttools

fonttools is a free Python library maintained by the type engineering community. It's the reference implementation used by Google Fonts, Adobe, and font professionals worldwide.

Install it:

pip install fonttools brotli

The brotli package is required for WOFF2 output. Then convert:

# TTF to WOFF2
python3 -m fonttools ttLib.woff2 compress input.ttf

# This produces input.woff2 in the same directory

For OTF input:

python3 -m fonttools ttLib.woff2 compress input.otf

For batch conversion of a directory:

for f in fonts/*.ttf; do
  python3 -m fonttools ttLib.woff2 compress "$f"
done

fonttools is available on macOS, Windows, and Linux. On macOS, if you use Homebrew: brew install python then pip3 install fonttools brotli.

Verifying Your WOFF2 File

After conversion, compare file sizes:

ls -lh input.ttf input.woff input.woff2

A healthy conversion produces WOFF2 roughly 50–70% the size of the original TTF. If WOFF2 is larger than WOFF, something went wrong — usually a missing or incorrect Brotli installation.

To verify the WOFF2 is valid before deployment, open it in a browser using a local @font-face CSS rule and confirm the text renders correctly.

When to Use WOFF vs WOFF2 (Practical Decision)

Use WOFF only when: your target audience includes significant older browser usage, or you want the simplest possible setup with no Python tooling.

Use WOFF2 as primary, WOFF as fallback when: you care about page performance and your audience is primarily modern browsers (which covers 95%+ of traffic for most sites today).

Use WOFF2 only when: you've confirmed your audience analytics show negligible legacy browser usage and you want to minimize HTTP requests.

The two-format @font-face stack (WOFF2 + WOFF) covers essentially all browsers since 2013 and is the safest general-purpose approach.

Frequently Asked Questions

Can I convert TTF to WOFF2 online without installing Python?

A few online tools offer WOFF2 conversion, but browser-based WOFF2 generators are rare because Brotli compression is computationally expensive in the browser. If you need WOFF2 regularly, installing fonttools (a one-time 2-minute setup) is the most reliable path.

Why is WOFF2 smaller than WOFF?

WOFF uses zlib compression (the same as gzip). WOFF2 uses Brotli, a newer algorithm developed by Google that achieves significantly better compression ratios on structured binary data like font outlines.

Do I need both WOFF and WOFF2?

For maximum compatibility, yes — the @font-face src stack lets modern browsers use WOFF2 while older ones fall back to WOFF. If your analytics show 95%+ modern browser usage, WOFF2-only is acceptable.