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If Indian-language text looks missing, substituted, or incorrectly shaped in a ScreenshotAPI capture, first check whether the request blocks font files. ScreenshotAPI documents block_font=true as blocking them and forcing system default fonts; set it to false or omit it where the documented default applies. Then check the page’s font, script coverage, font-loading requests, and capture timing. The right fix depends on the page, font, script, and exact endpoint version.
1. Check whether ScreenshotAPI is blocking fonts
Inspect the parameters sent to the ScreenshotAPI /v3/screenshot endpoint. Its resource control documentation says block_font=true prevents font files from loading and forces system default fonts. It lists false as the default and says that it allows custom web fonts.
- If the request explicitly sets
block_font=true, remove that setting or change it tofalsewhen the page depends on a custom font. - If the parameter is omitted, check the documentation for the endpoint and version actually used before assuming the default applies.
- Review other resource-blocking settings as well: blocking the stylesheet or the host serving the font can prevent the intended typography from being applied.
Make one change at a time and capture again. That helps distinguish a font-blocking issue from CSS, font coverage, or timing problems.
2. Verify the page’s font and CSS
A font can load successfully and still be the wrong face for the text. In a browser displaying the page, inspect a problem character or word and check the computed font family, weight, and style. Confirm that the intended CSS rule applies to the affected element, and that the font’s fallback sequence is sensible.
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- Compare the family name in the computed style with the family actually declared or loaded by the page.
- Check whether a more specific selector, inherited rule, or font-weight setting overrides the intended style.
- Confirm that the chosen font covers the precise script and characters shown. A family name alone does not establish glyph coverage or shaping support.
Google Fonts’ getting-started guide explains how to link a font stylesheet and select a family in CSS, and covers subset parameters and font-display. For other font hosts or self-hosted files, use the corresponding provider’s setup instructions.
3. Check that the stylesheet and font file finish loading
Hosted web fonts commonly require at least two network steps: the browser requests a stylesheet, then downloads the appropriate font file. Google Fonts describes this sequence in its technical considerations. Inspect the browser’s network activity for both requests and look for failed, blocked, or unfinished loads.
Font-loading appearance varies by browser. Google Fonts documents blank text while fonts load in Chrome and Safari, and a flash of unstyled text in Firefox; these are behaviors described for the browsers covered by that documentation, not a guarantee for every browser or version. If the capture happens before the font is ready, the screenshot may show fallback text or a transient rendering state.
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- Check the stylesheet response, then the font-file request it triggers.
- Look for network errors, blocked requests, or access restrictions affecting the font host.
- Compare a capture taken after the page has visibly settled with one taken earlier.
4. Make capture timing match the page
Pages that load fonts asynchronously or display text only after JavaScript runs need a capture point after those steps. ScreenshotAPI’s render documentation describes support for pages using JavaScript, lazy loading, or delays and lists render options. The appropriate readiness parameter depends on the endpoint and version in your request, so use that version’s documentation rather than assuming a parameter from a different ScreenshotAPI-branded service applies.
- Record the exact endpoint and relevant request parameters used for the problematic capture.
- Determine whether the font and affected text appear immediately or after a script, user-interface event, or delayed network response.
- Use the documented wait option that matches the page’s behavior, such as waiting for a relevant selector, a delay, or network activity to settle where supported.
- Capture again and compare the result with the page after it has settled in a browser.
A longer wait can help diagnose a timing problem, but it cannot fix a missing font file, an incorrect CSS rule, or absent script coverage.
5. Use CSS injection as a controlled test
ScreenshotAPI says injected CSS and JavaScript are applied at runtime before rendering and capture. Its CSS and JavaScript injection documentation explains the options, and its help page demonstrates importing a Google Font and applying a font-family rule. You can use an injected rule to test whether a known family improves the affected text:
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@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Devanagari&display=swap');
.problem-text {
font-family: 'Noto Sans Devanagari', sans-serif;
}Replace .problem-text with the selector for the affected element and use a family appropriate to the script being tested. Treat this as a diagnostic, not a guaranteed remedy: injection does not ensure the capture environment can reach every external font host, nor does the example establish coverage for every language or character. Check the font provider’s current family and subset instructions before relying on a specific request.
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6. Account for Indic-script shaping and layout
When characters appear broken, reordered, or incorrectly shaped, investigate CSS and font compatibility in addition to whether a file loaded. The Government of India’s localisation guidance has a section titled “12.2 CSS rendering Issues in Indic Script.” That makes script-aware CSS and font behavior relevant diagnostic areas; it does not identify one universal setting that fixes every page.
To narrow the cause, create a minimal page containing the same text, font, and relevant CSS, then compare its browser rendering with the API capture. If the minimal page works, examine the original page’s styles and loading sequence. If both render incorrectly, investigate the chosen font, character coverage, and script-specific styling.
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7. Troubleshoot by symptom
| What you see | Likely area to inspect | Next check |
|---|---|---|
| Text appears in a generic or unexpected font | Font blocking, failed font request, or CSS fallback | Check block_font, font-file network activity, and computed font family. |
| Text is blank in the capture but appears later in the browser | Capture timing or font loading state | Verify stylesheet and font requests complete before capture; configure a documented wait that matches the page. |
| Only some characters are missing | Glyph coverage, subset, or fallback behavior | Check that the selected face covers the exact characters and that the expected stylesheet or subset is being served. |
| Characters load but look incorrectly shaped or laid out | Font compatibility or Indic-script CSS rendering | Compare computed styles and test the same text, font, and CSS in a minimal page. |
| Injected styling has no visible effect | Selector mismatch, unavailable external font, or missing glyph support | Confirm the selector matches, inspect font-host requests, and verify coverage; injection alone does not guarantee either. |
| A parameter from another screenshot service is rejected or has no effect | Wrong product identity or endpoint version | Confirm the exact host and endpoint. Do not assume a similarly named service uses the same controls. |
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Frequently Asked Questions
Does a ScreenshotAPI font-blocking parameter default to blocking fonts?
The documentation for the `/v3/screenshot` endpoint lists `block_font=false` as the default. Confirm the endpoint and version in your own request.
Is a particular Google Font guaranteed to fix every Indian-language screenshot?
No. The font must cover the specific script and characters, load in the capture environment, and work with the page’s CSS and capture timing.
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