--- title: Custom fonts description: Learn how to add custom fonts to Browser Run for use in screenshots and PDFs. image: https://developers.cloudflare.com/dev-products-preview.png --- > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/browser-run/llms.txt > Use this file to discover all available pages before exploring further. [Skip to content](#%5Ftop) # Custom fonts Browser Run uses a managed Chromium environment that includes a [standard set of pre-installed fonts](https://developers.cloudflare.com/browser-run/reference/supported-fonts/). When you generate a screenshot or PDF, text is rendered using the fonts available in this environment. If your page specifies a font that is not pre-installed, Chromium will automatically fall back to a similar supported font. If you need a specific font that is not pre-installed, you can inject it into the page at render time. You can load fonts from an external URL or embed them directly as a Base64 string. How you add a custom font depends on how you are using Browser Run: * If you are using [Puppeteer](https://developers.cloudflare.com/browser-run/puppeteer/), [Playwright](https://developers.cloudflare.com/browser-run/playwright/), or [CDP](https://developers.cloudflare.com/browser-run/cdp/), refer to the [Browser sessions](#browser-sessions) section. * If you are using [Quick Actions](https://developers.cloudflare.com/browser-run/quick-actions/), refer to the [Quick Actions](#quick-actions) section. ## Browser sessions Use `addStyleTag` to inject a `@font-face` rule into the page before capturing your screenshot or PDF. You can load the font file from a CDN URL or embed it as a Base64-encoded string. The examples below use [Puppeteer](https://developers.cloudflare.com/browser-run/puppeteer/) with [Workers Bindings](https://developers.cloudflare.com/browser-run/puppeteer/#use-puppeteer-in-a-worker). If you are connecting via [CDP](https://developers.cloudflare.com/browser-run/cdp/), the only difference is how you connect to the browser. Once connected, `page.addStyleTag()` works the same way. Refer to [CDP connection example](#cdp-connection-example) for details. ### From a CDN URL * [ JavaScript ](#tab-panel-7164) * [ TypeScript ](#tab-panel-7165) Example with [Puppeteer](https://developers.cloudflare.com/browser-run/puppeteer/) and a CDN source: JavaScript ``` const browser = await puppeteer.launch(env.MYBROWSER);const page = await browser.newPage();await page.addStyleTag({ content: ` @font-face { font-family: 'CustomFont'; src: url('https://your-cdn.com/fonts/MyFont.woff2') format('woff2'); font-weight: normal; font-style: normal; } body { font-family: 'CustomFont', sans-serif; } `,}); ``` Example with [Puppeteer](https://developers.cloudflare.com/browser-run/puppeteer/) and a CDN source: TypeScript ``` const browser = await puppeteer.launch(env.MYBROWSER);const page = await browser.newPage();await page.addStyleTag({ content: ` @font-face { font-family: 'CustomFont'; src: url('https://your-cdn.com/fonts/MyFont.woff2') format('woff2'); font-weight: normal; font-style: normal; } body { font-family: 'CustomFont', sans-serif; } `,}); ``` ### Base64-encoded The following examples use [Playwright](https://developers.cloudflare.com/browser-run/playwright/), but this method works the same way with [Puppeteer](https://developers.cloudflare.com/browser-run/puppeteer/). * [ JavaScript ](#tab-panel-7166) * [ TypeScript ](#tab-panel-7167) Example with a Base64-encoded data source: JavaScript ``` const browser = await playwright.launch(env.MYBROWSER);const page = await browser.newPage();await page.addStyleTag({ content: ` @font-face { font-family: 'CustomFont'; src: url('data:font/woff2;base64,') format('woff2'); font-weight: normal; font-style: normal; } body { font-family: 'CustomFont', sans-serif; } `,}); ``` Example with a Base64-encoded data source: TypeScript ``` const browser = await playwright.launch(env.MYBROWSER);const page = await browser.newPage();await page.addStyleTag({ content: ` @font-face { font-family: 'CustomFont'; src: url('data:font/woff2;base64,') format('woff2'); font-weight: normal; font-style: normal; } body { font-family: 'CustomFont', sans-serif; } `,}); ``` ### CDP connection example When connecting via [CDP](https://developers.cloudflare.com/browser-run/cdp/), you connect to the browser using a WebSocket endpoint instead of a Workers Binding. Once connected, you use `page.addStyleTag()` the same way as the examples above. JavaScript ``` import puppeteer from "puppeteer-core"; const ACCOUNT_ID = "your-account-id";const API_TOKEN = "your-api-token"; // Create a browser session via CDPconst response = await fetch( `https://api.cloudflare.com/client/v4/accounts/${ACCOUNT_ID}/browser-rendering/devtools/browser`, { method: "POST", headers: { Authorization: `Bearer ${API_TOKEN}` }, },);const { webSocketDebuggerUrl } = await response.json(); // Connect Puppeteer to the sessionconst browser = await puppeteer.connect({ browserWSEndpoint: webSocketDebuggerUrl, headers: { Authorization: `Bearer ${API_TOKEN}` },}); const page = await browser.newPage(); // Add a custom font — same as with Workers Bindingsawait page.addStyleTag({ content: ` @font-face { font-family: 'CustomFont'; src: url('https://your-cdn.com/fonts/MyFont.woff2') format('woff2'); font-weight: normal; font-style: normal; } body { font-family: 'CustomFont', sans-serif; } `,}); // Take a screenshot, generate a PDF, etc.await page.goto("https://example.com"); browser.disconnect(); ``` ## Quick Actions When using [Quick Actions](https://developers.cloudflare.com/browser-run/quick-actions/), you can load custom fonts by including the `addStyleTag` parameter in your request body. This works with both the [screenshot](https://developers.cloudflare.com/browser-run/quick-actions/screenshot-endpoint/) and [PDF](https://developers.cloudflare.com/browser-run/quick-actions/pdf-endpoint/) endpoints. ### From a CDN URL Terminal window ``` curl -X POST 'https://api.cloudflare.com/client/v4/accounts//browser-rendering/screenshot' \ -H 'Authorization: Bearer ' \ -H 'Content-Type: application/json' \ -d '{ "url": "https://example.com/", "addStyleTag": [ { "content": "@font-face { font-family: '\''CustomFont'\''; src: url('\''https://your-cdn.com/fonts/MyFont.woff2'\'') format('\''woff2'\''); font-weight: normal; font-style: normal; } body { font-family: '\''CustomFont'\'', sans-serif; }" } ] }' \ --output "screenshot.png" ``` ### Base64-encoded Terminal window ``` curl -X POST 'https://api.cloudflare.com/client/v4/accounts//browser-rendering/screenshot' \ -H 'Authorization: Bearer ' \ -H 'Content-Type: application/json' \ -d '{ "url": "https://example.com/", "addStyleTag": [ { "content": "@font-face { font-family: '\''CustomFont'\''; src: url('\''data:font/woff2;base64,'\'') format('\''woff2'\''); font-weight: normal; font-style: normal; } body { font-family: '\''CustomFont'\'', sans-serif; }" } ] }' \ --output "screenshot.png" ``` For more details on using `addStyleTag` with Quick Actions, refer to [Customize CSS and embed custom JavaScript](https://developers.cloudflare.com/browser-run/quick-actions/screenshot-endpoint/#customize-css-and-embed-custom-javascript). ```json {"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/browser-run/features/custom-fonts/#page","headline":"Custom fonts · Cloudflare Browser Run docs","description":"Learn how to add custom fonts to Browser Run for use in screenshots and PDFs.","url":"https://developers.cloudflare.com/browser-run/features/custom-fonts/","inLanguage":"en","image":"https://developers.cloudflare.com/dev-products-preview.png","dateModified":"2026-04-23","publisher":{"@type":"Organization","name":"Cloudflare","url":"https://www.cloudflare.com/"},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/browser-run/","name":"Browser Run"}},{"@type":"ListItem","position":3,"item":{"@id":"/browser-run/features/","name":"Features"}},{"@type":"ListItem","position":4,"item":{"@id":"/browser-run/features/custom-fonts/","name":"Custom fonts"}}]} ```