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Fix Persian rendering in html2canvas by isolating four variables in order: right-to-left direction, font readiness, spacing and wrapping, and the renderer mode. html2canvas has historical RTL support, but it reconstructs the DOM in the browser and does not implement every CSS property. A page that looks correct in the browser can therefore produce a canvas with reversed punctuation, separated glyphs, fallback-font metrics, or different line breaks.
The reliable approach is to record your exact environment, reproduce the failure in a small test page, wait for the intended font, test conservative RTL and spacing styles, and compare the default renderer with foreignObjectRendering where supported. Treat old issue comments as diagnostic clues rather than universal fixes.
Why Persian text can change in the captured canvas
html2canvas is a browser-side renderer. It reads a DOM element and reconstructs it as a canvas; it does not ask a server to render the page. The project also states: “Every CSS property must be manually implemented to render correctly, so html2canvas will never have full CSS support.” That limitation matters for Persian because shaping, bidirectional text, font metrics, line breaking and punctuation placement interact.
RTL support was added in historical project work, including pull request #2653, but that does not prove that every Persian layout works in every html2canvas release, browser or operating system. A visible failure may be an RTL-direction problem, a font-loading race, unsupported CSS, or a combination of them.
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Start with a reproducible diagnosis
Record the environment
- Installed html2canvas version.
- Browser name and version, operating system, and whether the capture runs in a normal tab, iframe or automation context.
- Font family, font source (local, same-origin or remote), and the CSS that selects it.
- The element’s computed
direction,unicode-bidi, alignment, spacing and wrapping rules. - Whether the failure affects Persian-only text, mixed Persian and Latin text, punctuation, or all of them.
Historical reports cover different versions and browsers. A workaround that helped an old release is not evidence of a current defect or a universal solution.
Make a small comparison page
Use one short Persian-only line, one mixed-direction line and the exact font and styles from the failing component. Compare the browser DOM with the resulting image. For example:
<div id="capture" lang="fa" dir="rtl">
<p class="fa-only">این یک آزمایش کوتاه است.</p>
<p class="mixed">نسخه 2.0 — html2canvas</p>
</div>
<script>
document.fonts.ready.then(async () => {
const canvas = await html2canvas(document.querySelector('#capture'));
document.body.appendChild(canvas);
});
</script>Keep the test case small enough that you can change one variable at a time. The project’s FAQ recommends a reproducible test when a CSS property is missing or incomplete.
Check RTL direction and bidirectional content
Set direction at the component boundary
Apply dir="rtl" or direction: rtl to the element being captured, not only to a distant page wrapper. Set alignment explicitly when the design requires it:
#capture {
direction: rtl;
text-align: right;
}
Inspect the computed value in developer tools. If Persian-only text is correct but Latin fragments, numbers or punctuation move, the problem is likely bidirectional ordering rather than missing Persian glyphs. Test the mixed line separately and avoid changing several bidi properties at once.
Do not assume RTL support means full CSS support
The project history confirms that RTL support was added, while the documentation still cautions that CSS support is incomplete. Therefore, test your exact release and browser. If the browser DOM is correct but the canvas is not, preserve the minimal example for an issue report instead of assuming that adding more direction rules will help.
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Wait for the Persian-capable font
A fallback font can have different glyph coverage, shaping behavior and character widths. Historical reports describe captures made before fonts were available and captures involving dynamically uploaded fonts; those reports are old and version-specific, but they make font readiness an essential check.
Use a font-readiness gate
await document.fonts.ready;
const target = document.querySelector('#capture');
const canvas = await html2canvas(target);
Run the capture only after the intended font has loaded. Confirm in developer tools that the computed font family is the one you expect, and compare a capture made before and after readiness. If the result changes, the original problem was at least partly a timing or fallback-metric issue. This gate does not guarantee correct Persian shaping when another CSS or renderer limitation is involved.
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- Verify that the font request succeeds before capture.
- Confirm the font is usable in the page’s origin and frame context.
- Do not diagnose glyph shaping from a capture taken while a user-selected font is still being uploaded or applied.
- Keep the font declaration identical in the minimal test and the production component.
Test spacing and wrapping without destroying shaping
Separated-looking Arabic or Persian letters can result from CSS spacing or word splitting rather than from the font itself. Historical issue comments reported improvement after restoring normal letter spacing and avoiding aggressive word breaking. These are user-reported experiments, not official guarantees.
Run controlled CSS experiments
- Capture the baseline with the application’s current CSS.
- Temporarily set
letter-spacing: normal. - Remove character-level breaking such as
word-break: break-wordand capture again. - Change only one rule per capture, then compare the images.
#capture .persian-text {
letter-spacing: normal;
word-break: normal;
overflow-wrap: normal;
}
Do not treat these declarations as a universal Persian stylesheet. They are diagnostic controls that can reveal whether spacing or wrapping rules are causing the discrepancy. If your layout requires a deliberate overflow policy, restore it after identifying the failing rule and test a narrower alternative.
Compare html2canvas renderer modes
The documented foreignObjectRendering option can be compared with the default renderer in browsers that support it:
await document.fonts.ready;
const element = document.querySelector('#capture');
const normalCanvas = await html2canvas(element);
const foreignCanvas = await html2canvas(element, {
foreignObjectRendering: true
});
This is an experiment, not a Persian-specific fix. Browser support, security restrictions and CSS behavior can differ between modes. Keep the mode that reproduces the required visual result in your supported browsers, and document the browser/version assumption in your application.
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A complete capture routine for a controlled test
async function capturePersian(selector, options = {}) {
const element = document.querySelector(selector);
if (!element) throw new Error(`No element found for ${selector}`);
if (document.fonts && document.fonts.ready) {
await document.fonts.ready;
}
return html2canvas(element, {
...options,
// Set this to true only for a supported-browser comparison.
foreignObjectRendering: Boolean(options.foreignObjectRendering)
});
}
const canvas = await capturePersian('#capture');
document.body.appendChild(canvas);
Use the routine in your minimal page first. Then add production features one by one—dynamic font loading, mixed-direction labels, custom spacing, and complex layout—so the first change that alters the output identifies the likely cause.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common symptoms
Letters appear disconnected or unusually far apart
Check that the intended font is ready, then test letter-spacing: normal. Remove word-break: break-word or similar character splitting and recapture. If only the canvas is affected, compare renderer modes and retain the minimal reproduction.
Text is in the wrong visual order
Inspect computed direction on the captured element. Test a Persian-only line against a mixed Persian/Latin line. Explicitly set the component’s RTL direction and alignment, then determine whether punctuation or Latin fragments are the only misplaced parts.
The browser uses one font but the image uses another
Capture after document.fonts.ready, verify the font request and computed family, and compare before/after images. Historical font reports do not establish that every current html2canvas release mishandles fonts, so confirm the behavior in your installed version.
Line breaks differ from the DOM
Look for unsupported or partially implemented CSS, width changes, word-breaking rules and fallback-font metrics. Simplify the element, remove one layout rule at a time, and test the exact browser and html2canvas version.
foreignObjectRendering fails or changes the result
That option is conditional on browser support and is not documented as a Persian remedy. Test it only in a supported browser and keep the default renderer as a fallback when the alternate mode is unavailable or less consistent.
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The minimal example still fails
Prepare an issue report containing the smallest HTML and CSS example, html2canvas version, browser and operating system, font-loading method, and the visible DOM versus canvas result. The project FAQ asks for a test case when a CSS property is missing or incomplete.
Performance and reliability considerations
- Capture only the smallest element that meets your requirement; large full-page DOMs increase work and make font or layout races harder to diagnose.
- Wait for fonts before every capture path, including user-selected or dynamically loaded fonts.
- Keep a browser/version matrix for RTL and mixed-direction components instead of validating only one desktop setup.
- Use deterministic test content containing Persian, Latin, numbers and punctuation so regressions are visible.
- Do not infer correctness from a single screenshot. Compare the DOM and canvas after each controlled change.
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Frequently Asked Questions
Does upgrading html2canvas automatically fix Persian text?
No. RTL support exists in the project history, but CSS support is incomplete and behavior depends on the release, browser, font and styles. Reproduce the issue with your actual environment before changing versions.
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Should I always enable foreignObjectRendering for Persian?
No. The option is browser-dependent and is not documented as a Persian-specific fix. Compare it with the default renderer in the browsers you support.
Can a paid Persian font guarantee a correct html2canvas capture?
No. A suitable font can provide glyph coverage and metrics, but the available evidence does not establish that purchasing a font fixes html2canvas direction, shaping or CSS reconstruction.
What information belongs in an html2canvas bug report?
Include a minimal HTML/CSS reproduction, html2canvas version, browser and operating system, font source and loading method, and a comparison of the browser DOM with the captured canvas.
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