To render a webpage as a PDF with custom fonts in Docker, make the fonts available to Chromium—either install them in the container or load them through the page’s CSS—then wait for font loading before calling Puppeteer’s page.pdf(). Puppeteer waits for fonts by default during PDF generation. The example below installs local fonts in a Docker image, checks font loading in the page, and saves a PDF.
Choose how to provide the custom fonts
Use the delivery method that fits how the page and container are managed. These are implementation options, not a universal reliability or performance ranking.
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| Approach | Use it when | What to check |
|---|---|---|
| Install fonts in the container | The page expects fonts installed on the host, several pages share the same fonts, or rendering must not depend on fetching font files at capture time. | Copy the files into a font directory supported by your Linux distribution, refresh its font cache where needed, and ensure the Chromium process can see the fonts. |
| Load fonts through page CSS | You control the page’s CSS or HTML and can declare the font with @font-face. |
Make sure the font URL is reachable from the browser container and that the font request completes before PDF generation. |
In either case, the CSS font-family must refer to the face you actually installed or declared, and that font file must contain the glyphs used by the document. A font can load successfully yet still lack particular characters, such as a symbol or a character from another writing system.
Build a Puppeteer image with local fonts
The Dockerfile below follows the local-font approach. It uses Puppeteer’s published Docker image and copies font files from a directory named fonts beside the Dockerfile. The example uses /usr/local/share/fonts/ and fc-cache -fv, a community implementation pattern; font directories, font-cache tools, and package names can vary by base distribution. Check these commands against the image you use.
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Put the font files you are licensed to use in ./fonts. The page’s CSS must use the correct family name for those files.
FROM ghcr.io/puppeteer/puppeteer:latest
USER root
COPY ./fonts/ /usr/local/share/fonts/custom/
RUN fc-cache -fv
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
USER pptruser
CMD ["node", "render.js"]This assumes the selected image provides the expected user, Node.js, Puppeteer dependencies, and font-cache command. If you build from a different base image, install the browser’s required OS dependencies and adapt the font-installation steps rather than assuming this Dockerfile transfers unchanged.
Install the project dependency
For a minimal project, create package.json with Puppeteer as a dependency, then run npm install to produce the lockfile used by npm ci in the image build.
{
"private": true,
"scripts": {
"render": "node render.js"
},
"dependencies": {
"puppeteer": "^24.0.0"
}
}The version range is an example, not a compatibility guarantee. Pin and test the Puppeteer version and browser image you intend to deploy together.
Render the webpage and wait for the fonts
Save the following as render.js. It navigates to a URL supplied as the first argument, waits for the navigation, explicitly waits for document.fonts.ready, and writes a PDF. The explicit font wait makes the intent clear even though Puppeteer’s PDF option waitForFonts defaults to true.
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const puppeteer = require('puppeteer');
async function main() {
const url = process.argv[2];
if (!url) {
throw new Error('Usage: node render.js <url> [output.pdf]');
}
const outputPath = process.argv[3] || 'page.pdf';
const browser = await puppeteer.launch({
// The official Puppeteer Docker image is designed to run Chromium sandboxed.
// Keep the image's required sandbox permissions configured at container launch.
});
try {
const page = await browser.newPage();
await page.goto(url, { waitUntil: 'networkidle2', timeout: 60000 });
// Wait for fonts declared through CSS and fonts available to the browser.
await page.evaluate(() => document.fonts.ready);
await page.pdf({
path: outputPath,
format: 'A4',
printBackground: true,
waitForFonts: true
});
console.log(`Saved ${outputPath}`);
} finally {
await browser.close();
}
}
main().catch((error) => {
console.error(error);
process.exitCode = 1;
});networkidle2 is a navigation wait condition, not proof that every font or image rendered as intended. Pages with persistent connections or unusual loading behavior may need a different readiness condition, such as waiting for a page-specific selector. The explicit font-ready wait applies after navigation; if the page dynamically changes its content or font declarations afterward, wait for that application-specific work too.
Build and run the container
-
Build the image from the directory containing the Dockerfile,
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Run it with the sandbox permissions required by the Puppeteer Docker image, and use an init process to manage child processes:
docker run --init --rm --cap-add=SYS_ADMIN webpage-pdf https://example.com output.pdf -
Confirm that
output.pdfwas created and inspect pages where the custom font or special glyphs matter. Test with the actual URL, font files, and container runtime you plan to use.
The Puppeteer Docker guide describes sandbox operation, the SYS_ADMIN capability, and use of --init or an equivalent init process. Do not remove sandboxing or add broader privileges casually; match the runtime permissions to the image and your deployment’s security requirements.
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Choose print or screen styling and tune the PDF
page.pdf() renders with print media by default. If the page should use its screen stylesheet instead, set the media type before generating the PDF:
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await page.emulateMediaType('screen');
await page.pdf({ path: 'page.pdf', printBackground: true });For a print-oriented PDF, leave print media selected and define print rules in the page’s CSS where you can. Puppeteer’s PDF options let you set paper format, margins, landscape orientation, page ranges, and whether backgrounds are printed. CSS page sizing can also affect the resulting layout, so check the page’s print styles alongside the PDF options.
Example PDF options
await page.pdf({
path: 'page.pdf',
format: 'A4',
landscape: false,
printBackground: true,
margin: {
top: '12mm',
right: '12mm',
bottom: '12mm',
left: '12mm'
},
// Optional examples:
// pageRanges: '1-3',
// preferCSSPageSize: true,
waitForFonts: true
});Adjust paper size and margins for the document rather than treating these example values as required settings. If the page’s CSS specifies its own page size, decide whether that CSS or the PDF format option should govern the output.
Verify the rendered font, not just the PDF file
A successful call to page.pdf() confirms that Puppeteer produced a PDF; it does not establish that every intended font and glyph appeared correctly. Check the output visually, especially for headings, non-Latin scripts, symbols, and text that wraps near page boundaries.
- Check the family name: confirm the page’s
font-familymatches the installed font’s family or the name declared in@font-face. - Check glyph coverage: verify the chosen font includes the characters the page uses. Missing glyphs can fall back to another font even when the main face loaded.
- Check the browser can access the font: installed fonts must be visible to the Chromium process; CSS-loaded font files must be reachable and finish loading.
- Check print rules: PDF generation uses print media unless you explicitly emulate screen media, so screen-only font or layout rules may not apply.
- Check the deployed image: test the built container with the real browser version, fonts, page, and runtime permissions—not only on a developer machine.
Troubleshoot common failures
The PDF uses a fallback font
Check that the font files were copied into the image, that the font cache was refreshed if the distribution requires it, and that the browser process can see the installed faces. Verify the CSS family name and inspect whether the requested characters exist in the font.
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A CSS-hosted font is missing in Docker
The browser may not be able to reach the font URL, or the request may not have completed before capture. Check the page’s network access and font-loading errors, then wait for document.fonts.ready after the page and its relevant content have loaded.
The PDF has the wrong layout or missing backgrounds
Remember that page.pdf() uses print media by default. Use page.emulateMediaType('screen') if you need screen styling; set printBackground: true when backgrounds should print. Review the page’s print CSS, paper size, margins, orientation, and any CSS page-size rules.
Chromium exits or fails to launch in the container
Check that the image’s required browser dependencies are present and that its sandbox permissions are configured correctly. The Puppeteer Docker guide specifies SYS_ADMIN for its documented sandboxed setup and recommends an init process such as Docker’s --init. Custom images can have different dependencies, so validate the exact image and runtime configuration.
Navigation times out or never becomes idle
A page may keep network activity open or may not become idle under the chosen wait condition. Check whether the page loaded and whether its fonts are accessible; for pages with ongoing requests, use a more appropriate navigation condition and wait for a meaningful selector or page-specific readiness signal before generating the PDF.
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Frequently Asked Questions
Does Puppeteer wait for fonts before creating a PDF?
Yes. Puppeteer’s PDF option `waitForFonts` defaults to `true` and waits for `document.fonts.ready`; the example also waits for that promise explicitly.
Can I use custom fonts without installing them in Docker?
Yes, if you control the page, you can load the fonts through CSS such as `@font-face`. The browser container must be able to fetch those font files, and they must finish loading before capture.
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