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To get Bengali text to render correctly in a Puppeteer screenshot, make sure the Chromium process can access a Bengali-capable font, the page’s CSS selects that font or a suitable fallback, and the font has finished loading before capture. A font installed on your computer may not be installed in the Linux container that runs Puppeteer.
Why Bengali text breaks in Puppeteer screenshots
Chromium can only render glyphs using fonts it can access. If the selected font does not cover Bengali characters and no fallback font does either, text may appear as empty boxes or missing glyphs. Even when glyphs exist, Bengali shaping can fail if the browser or font setup does not handle complex text layout correctly. The Noto Sans Bengali specimen describes Bengali as an Indic script requiring complex text layout support.
A common source of environment differences is that Puppeteer launches Chromium in a separate Linux image or container. A font available on your desktop is not automatically available there. Puppeteer’s troubleshooting guide notes that additional font files may be needed for scripts that are not covered by the runtime’s installed fonts.
Set a Bengali-capable font in the page’s CSS
Choose a font with Bengali coverage and put it early in the CSS font-family stack. For example:
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body {
font-family: "Noto Sans Bengali", "Noto Sans", sans-serif;
}This declaration only selects fonts; it does not install or fetch them. Make sure the page actually has access to the named font. CSS tries later families when an earlier family lacks a needed character, then falls back to the system default if no family in the stack covers it. See Noto’s font use guidance.
Noto Sans Bengali is a documented Bengali-script sans-serif family. Noto Sans Bengali UI is intended for user interfaces with limited vertical space; Noto’s guidance recommends considering script-specific UI families for compact interfaces and non-UI families for documents. Choose based on the page’s layout and test the result rather than assuming the UI variant suits every page.
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Choose how to make the font available
Install the font in the runtime
For a controlled Linux image or container, include the Bengali-capable font files in the deployed image and refresh the font cache if the image’s setup requires it. Verify the files in the same runtime that launches Chromium—not only on the host or your development machine. This approach avoids relying on a remote font request, but you must maintain the font as part of your deployment.
Load a web font
If the page serves a Bengali-capable web font, confirm the Puppeteer runtime can reach the font URL and that the request succeeds. Noto documents web-font delivery through Google Fonts and the use of CSS family stacks in its usage guide. A remote font is convenient when the page already uses one, but introduces a network dependency. Neither approach is universally faster or better; test the one that matches your deployment.
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Capture only after navigation and fonts are ready
Here is a complete minimal ES-module example using Puppeteer. Replace the URL with the Bengali page you need to capture. It waits for navigation to reach network idle, then waits for the page’s FontFaceSet when that browser API is available before saving a full-page PNG.
import puppeteer from 'puppeteer';
const browser = await puppeteer.launch({ headless: true });
try {
const page = await browser.newPage();
await page.goto('https://example.com/bengali-page', {
waitUntil: 'networkidle0',
});
await page.evaluate(async () => {
if (document.fonts?.ready) {
await document.fonts.ready;
}
});
await page.screenshot({ path: 'bengali-page.png', fullPage: true });
} finally {
await browser.close();
}The font readiness wait tells you the page’s font-loading set has settled; it does not prove the intended font was available or that every Bengali glyph rendered correctly. Likewise, network idle does not guarantee that dynamic content is complete. Inspect the output and the browser’s network or console logs, and check the font files and computed CSS in the deployed runtime. The exact Puppeteer APIs available can vary by installed package version, so consult documentation for the version in your project before relying on version-specific behavior.
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Check the screenshot in the production environment
- Capture the page using the same Chromium build, operating-system image, network access, and font files as the deployed job.
- Inspect the screenshot for missing glyphs, broken conjuncts, or malformed marks.
- Check the page’s computed
font-familyand verify that its Bengali font request succeeded, if it uses a web font. - Verify that the container actually contains the intended font files when fonts are installed locally.
- Compare with a screenshot from your development machine to identify environment-specific differences.
Noto’s specimen lists 695 glyphs, 17 OpenType features, and 173 supported characters across five Unicode blocks for Noto Sans Bengali; the specimen does not state a publication year. These family figures describe that specimen, not a guarantee that a particular page, font file, or runtime will render correctly.
Troubleshoot broken Bengali text in order
Boxes or missing characters
- Likely cause: Chromium cannot access a font with the required Bengali glyphs, or the CSS stack does not select an available font.
- Fix: Install a Bengali-capable font in the deployed image or ensure the page’s web-font request succeeds. Put the intended family near the start of the CSS stack and inspect the computed style.
It works locally but fails in a container
- Likely cause: The local machine and container have different installed fonts, browser builds, or network access.
- Fix: Reproduce the container’s exact runtime and check its font files and failed network requests. Do not treat a desktop screenshot as proof of equivalent container font coverage.
The page is captured before the font appears
- Likely cause: Capture runs while a remote font is still loading, or before dynamic page content is ready.
- Fix: Wait for navigation, then for the document’s font set where supported; also wait for any application-specific content to finish rendering. Inspect the result, since a settled font-loading state alone does not confirm correct glyph selection.
Glyphs appear, but conjuncts or marks look wrong
- Likely cause: This may be a shaping or complex-text-layout issue rather than a simple missing-font problem.
- Fix: Test a current Chromium build and a font with Bengali coverage. Bengali requires complex text layout support, as described in the Noto Sans Bengali specimen.
Should I use --no-sandbox?
No—not as a fix for broken Bengali text. That flag does not install fonts or supply missing glyphs. Diagnose font availability, CSS selection, font loading, and shaping instead.
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Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server for developers. One GET request can return a PNG, JPEG, WebP, or PDF. Its clean-shot steps can accept cookie or consent banners and remove more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and each response reports the page verdict and billing status in headers. Its MCP server offers screenshot tools for AI agents, including Claude, Cursor, and other MCP clients. These features do not replace checking that a page’s Bengali font itself renders as intended.
For example, this cURL request captures a page as WebP; replace the URL and use your API key. See the ScreenshotNeo documentation for request options.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com/bengali-page -o shot.webpThe free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots. Sign up for ScreenshotNeo’s free plan.
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Does Puppeteer automatically install Noto Sans Bengali?
No. Check whether the font is present in the Chromium runtime or successfully loaded by the page.
Does waiting for network idle guarantee Bengali text is correct?
No. It does not confirm that the intended font loaded, that it covers the characters, or that shaping is correct.
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