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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsIf html2canvas turns words containing fi into missing, distorted, or incorrectly shaped text, test the font’s standard ligature feature first. Apply font-feature-settings: "liga" 0 to the element being captured, or set it in html2canvas’s onclone callback so only the render copy changes. This is a community-reported workaround, not a universal guarantee: verify it with your exact font, browser, and html2canvas version.
What the fi problem actually is
Fonts can replace character sequences with designed glyphs. The OpenType standard ligature feature, commonly identified as liga, may substitute a single combined glyph for f followed by i. The same feature can affect ff and fl.
A reported html2canvas issue describes those combinations disappearing or rendering incorrectly in an exported JPEG. A separate Stack Overflow answer to the exact fi question suggests disabling standard ligatures before capture. These reports establish a reproducible diagnostic path, not a claim that every html2canvas installation has the same defect.
First, reproduce the exact failure
Do not start by changing several text styles at once. Capture a minimal element containing the failing word and record the environment:
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- The exact phrase, including capitalization and punctuation.
- The computed
font-family, weight, style, and whether the font is web-hosted or local. - Browser name and version.
- The installed html2canvas version.
- Output format and scale settings.
Compare the generated canvas with the browser’s normal DOM rendering. If the browser itself displays the wrong glyph, fix font loading or CSS first; html2canvas cannot faithfully reproduce a font that the browser has not loaded correctly.
Quick workaround: disable standard ligatures
Change the live element
The shortest reported workaround sets fontFeatureSettings immediately before the html2canvas call:
const el = document.getElementById('myElement');
el.style.fontFeatureSettings = '"liga" 0';
html2canvas(el).then(canvas => {
document.body.appendChild(canvas);
});The declaration tells the browser not to apply the standard ligature feature while html2canvas paints the element. Keep the change limited to the target rather than applying it globally; other text on the page may intentionally rely on ligatures.
Use a stylesheet class
A class is easier to inspect and remove than an inline declaration:
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.html2canvas-no-ligatures {
font-feature-settings: "liga" 0;
}const el = document.querySelector('#myElement');
el.classList.add('html2canvas-no-ligatures');
html2canvas(el).then(canvas => {
// Use the canvas here.
el.classList.remove('html2canvas-no-ligatures');
});Restore the class after the promise resolves if the live page should continue using its original typography. If the capture can fail, use try/finally so cleanup still runs.
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Safer approach: apply the fix in onclone
html2canvas documents onclone as a callback for modifying the cloned document used for rendering without changing the original DOM. This is preferable when users must not see a temporary font change.
const source = document.getElementById('myElement');
html2canvas(source, {
onclone: (clonedDocument) => {
const clonedElement = clonedDocument.getElementById('myElement');
if (clonedElement) {
clonedElement.style.fontFeatureSettings = '"liga" 0';
}
}
}).then(canvas => {
const link = document.createElement('a');
link.download = 'capture.png';
link.href = canvas.toDataURL('image/png');
link.click();
});Use a selector that is unique in the cloned document. If your target is generated dynamically, assign a stable ID or class before calling html2canvas. Confirm the callback behavior against the version installed in your project.
Choosing between live CSS and onclone
| Approach | Advantages | Risks and checks |
|---|---|---|
Set fontFeatureSettings on the live element |
Smallest change and easiest first test | The page is temporarily modified; restore the original style after capture |
Set it in onclone |
Keeps the visible page unchanged and isolates the capture fix | Requires a version that supports the documented callback behavior; verify the cloned selector |
When disabling liga does not fix the image
Confirm the font is loaded
Capture only after the intended web font has loaded. In modern browsers, wait for document.fonts.ready:
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const canvas = await html2canvas(document.getElementById('myElement'), {
onclone: (doc) => {
doc.getElementById('myElement').style.fontFeatureSettings = '"liga" 0';
}
});Also check the browser’s computed style and network panel. A fallback font can make the problem appear to be an html2canvas ligature bug when the intended font never arrived.
Test the smallest failing string
Reduce the content to words such as “office”, “final”, or “fluffy”, then add surrounding text back gradually. This distinguishes a glyph-substitution problem from layout, clipping, or missing-font problems.
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Inspect spacing styles
Negative letter-spacing has its own reported rendering issue in Chrome on Windows 10. That report also says letterRendering: true did not resolve the symptom. Do not treat that option as the proven fix for fi, and do not assume a spacing bug and a ligature bug share one cause.
Check the current option list
The current html2canvas configuration reference documents onclone but does not list letterRendering. Historical releases may differ, so inspect the documentation and package version used by your application before adding undocumented options.
Fonts, browser differences, and output formats
Font-specific behavior
Ligature design is part of the font. One family may have a visible fi ligature while another uses separate glyphs, and variable-font settings can change the result. Test every production font and weight that appears in your capture.
Browser and platform differences
Text shaping is performed by the browser and operating-system font stack before html2canvas paints the cloned DOM. A workaround that succeeds in one browser may produce a different result elsewhere. Include at least the browsers used by your users in visual regression tests.
PNG, JPEG, and scale
PNG is useful for inspecting glyph edges because it is lossless. JPEG compression can make a correct glyph look damaged at small sizes, so compare PNG output while diagnosing. A high scale improves detail but increases canvas memory and encoding time; it does not repair incorrect shaping.
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Production capture checklist
- Load the exact production font and wait for
document.fonts.ready. - Reproduce the failing
fi,ff, orflstring in a minimal element. - Try
font-feature-settings: "liga" 0on that element. - Move the declaration into
onclonewhen the visible page must remain unchanged. - Compare PNG output with the browser’s DOM rendering.
- Test each supported browser, font weight, viewport, and html2canvas version.
- Remove unrelated spacing or experimental options while isolating the cause.
- Keep a visual regression sample so a font or browser upgrade does not silently reintroduce the defect.
Performance and reliability considerations
Changing one font feature has negligible cost compared with cloning a large page and rasterizing images. The expensive operations are usually full-page layout, large images, high scale factors, and canvas encoding. Capture the smallest required element, avoid unnecessary scale increases, and release references to canvases after uploading or downloading them.
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FAQ
Is this a confirmed html2canvas bug?
The symptom has been reported, but the available issue description does not identify a universal browser and version range. Treat the ligature declaration as a testable workaround and validate it in your environment.
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Should I disable all OpenType features?
No. Disable only the standard ligature feature for the affected capture unless your design requirements call for another change. Broadly disabling typography features can alter appearance and readability.
Can this fix missing web fonts?
No. It changes ligature shaping after the font is available. Wait for the font to load and correct font-loading or cross-origin problems separately.
Will the workaround change copied or accessible text?
No. It changes glyph selection during rendering; the underlying DOM text remains the same. Using onclone also leaves the live document untouched.
Frequently Asked Questions
Does setting fontFeatureSettings guarantee correct fi rendering?
No. It is a community-reported workaround. Test the exact font, browser, and html2canvas version used by your application.
Is onclone supported in html2canvas?
The current configuration reference documents onclone for modifying the cloned rendering document. Verify behavior against your installed version.
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