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Collect every character your site can render, then use a font subsetter to keep those characters in a smaller webfont. For stable text, a corpus-specific subset is often simplest; for changing Chinese content, use broader coverage or split the font into Unicode-range files. Test the result on real pages and keep a fallback font stack.
1. Inventory every string the site can display
Start with the rendered text, not just the main article body. Include all pages and shared interface elements such as navigation, buttons, labels, form messages, error states, and punctuation. Include text created dynamically or loaded from a content system if it can appear to visitors.
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For content that changes often, a one-time character list can become incomplete. Plan either to regenerate the subset when content changes or to serve broader font coverage.
2. Build a deduplicated UTF-8 corpus
Extract the characters into a UTF-8 text file such as site-text.txt. Deduplicate the characters to avoid repeated entries, but preserve every distinct code point the site needs, including punctuation and any other scripts used alongside Chinese. Check the file for extraction errors before generating the font.
A character in the corpus can only be retained if it exists in the source font. fontTools’ subsetter accepts text files as input and offers options to fail when requested Unicode characters are missing; consult its documentation and the installed version’s help for the relevant options: fontTools subset documentation.
3. Generate the webfont subset
With fontTools installed, a basic command pattern is:
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pyftsubset input.otf --text-file=site-text.txt --flavor=woff2 --output-file=site-subset.woff2
Replace the input and output filenames with your actual files. fontTools supports TrueType/OpenType and WOFF inputs and can optimize output for webfont use. Check the installed version’s help and the source font’s format before running the command. Preserve the layout features and variation data your site requires, and enable missing-Unicode checks so a requested character absent from the source does not silently pass unnoticed. The tool’s available options are documented at fontTools subset documentation.
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4. Choose how to deliver the subset
| Approach | Best fit | Trade-off |
|---|---|---|
| One corpus-specific subset | Stable text, such as a known campaign, logo, or small static site | New characters need a rebuilt subset or will use a fallback font |
| Several Unicode-range subsets | Broader or changing text where the font is divided into codepoint ranges | CSS ranges and file coverage need careful testing |
Google Fonts request with text= |
Known text when the chosen family is available through Google Fonts | Depends on the hosted service and request; inspect the returned CSS and verify coverage |
One local subset with @font-face
For a single generated file, define an @font-face rule with its source URL and a suitable font-display value, then include the font in the site’s font stack. Keep fallback fonts so text remains readable if the webfont fails to load or lacks a character.
Multiple files with unicode-range
For a sliced font, declare a separate face for each file and assign each an appropriate unicode-range. The range tells the browser which characters a face is intended to serve; it does not create glyphs. Under the CSS Fonts specification, the effective character map is the intersection of the declared range and the actual character map in that font file: W3C CSS Fonts Module Level 3.
Rank #4
Google Fonts describes a similar sliced-file delivery approach in which browsers can request relevant pieces according to Unicode ranges: Google Developers Blog: Google Fonts launches Korean support. Do not copy a generic range and assume it covers your content or the regional glyph forms you need. Define ranges from your actual requirements, then inspect the font’s coverage.
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When the needed text is known and the family is available from Google Fonts, its API supports a text-specific request. Google says this can reduce file size by up to 90% in some cases; that is a vendor claim, not a guaranteed result for any particular Chinese font or site. See Google Fonts API getting started.
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Google’s documentation also explains that browsers supporting unicode-range select supported subsets for the rendered text and ignore the older subset= parameter. With text=, subset= is unnecessary. Check the generated CSS and resulting character coverage rather than relying on a request parameter alone.
5. Test coverage on real pages
Load the generated or hosted font on representative pages. Check the full inventory, including punctuation, interface text, dynamic content, and characters likely to be added later. Look for missing-glyph boxes and for characters unexpectedly rendered by the fallback font. Repeat the check at the weights and styles the site actually uses.
- If a character is missing, verify that it was extracted into the corpus and that the source font contains it.
- If it is in the font file but does not appear as intended, inspect the
@font-facedeclaration, the relevantunicode-range, and the loaded file. - If the site’s content, font, weights, scripts, or required characters change, rebuild or revalidate the subsets.
How to choose a strategy
Use a single corpus-specific file when the text is stable and you can rebuild it when needed. Prefer range-based files or a suitable hosted font request when coverage must accommodate a larger or evolving set of text. Google’s web.dev guidance recommends Unicode-range subsets and pyftsubset as practical ways to reduce webfont size: Reduce web font size. Google Fonts’ subset definitions are organized around code points and may include ranges, exclusions, and named Unicode blocks or scripts: Google Fonts Unicode subset definitions. Use those as descriptions of subset organization, not as a substitute for checking the actual font and site corpus.
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