Fix clipping in wkhtmltoimage by matching the adjustment to where content disappears: check screen height and crop height for bottom clipping; screen width, smart-width behavior, crop width, and CSS overflow for horizontal clipping; and render timing for content that appears after JavaScript runs. Change one variable at a time and verify the result with the same wkhtmltoimage build and environment.
First identify what is being clipped
Before changing options, save the exact command, input URL or file, output format, wkhtmltoimage version, operating system, and how the binary was installed or built. Then locate the missing content:
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- Bottom edge: Check the effective screen height, any crop height, and whether the page had finished expanding before capture.
- Right or left edge: Check screen width, smart-width behavior, crop width, fixed-width elements, and CSS overflow.
- Content missing inside the page: Check whether it is inserted or revealed asynchronously by JavaScript, rather than assuming the output dimensions are the problem.
Viewing the page in a browser can help identify intended content and layout, but it does not guarantee identical rendering: wkhtmltoimage may behave differently from a current browser.
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wkhtmltoimage distinguishes the page’s screen dimensions from the output crop. The command-line manual describes --height as the screen height; by default, height is calculated from page content. It describes --width as a guide unless smart width is disabled. The library interface also exposes screenWidth, smartWidth, and crop coordinates and dimensions, including crop.width and crop.height. See the wkhtmltoimage documentation and the upstream library page settings reference.
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For bottom clipping
- Check whether your invocation or library configuration sets a screen height or crop height.
- If a crop height is set, confirm that it extends far enough to include the desired content; increasing screen height alone will not help if the output crop still excludes it.
- If the page grows after load, fix the wait condition before judging the height. Content that has not been created yet cannot be recovered by a larger crop.
- Adjust one height or timing variable at a time, then capture again. There is no universal correct height for every page.
For right-edge or other horizontal clipping
- Inspect the requested screen width and the smart-width setting. The command-line manual says
--widthacts as a guide unless--disable-smart-widthis used to make it strict. - Check any crop width and horizontal crop position in the library configuration. A correct viewport can still produce a clipped image if the output crop excludes content.
- Inspect the page’s CSS for fixed-width containers, elements wider than the viewport, and
overflowrules that hide content. - Try a deliberate width change, or a strict width if the render needs a fixed viewport, and compare the layout. Choose values based on the page; the manuals do not prescribe one width for all sites.
Screen dimensions affect the render viewport; crop dimensions select the output window; CSS changes alter the page layout itself. Identify which boundary is wrong before changing all three.
Wait for JavaScript-driven content
A page may load its initial document before it has finished fetching data, expanding a component, or inserting content. wkhtmltoimage provides --javascript-delay and --window-status command-line options. The library reference documents load.jsdelay and waiting until JavaScript calls window.print(). Consult the command-line documentation and library settings for the exact option syntax for your use.
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Use a delay when completion time is predictable
Set a JavaScript delay long enough for the page’s content to appear, then capture again. Choose the delay by observing the target page; the documentation does not define a universally correct duration. A longer delay can increase capture time and still fail if the page’s work is unpredictable.
Prefer an explicit readiness signal when available
If you control the page, have its JavaScript set a known window.status value when the content needed for the screenshot is ready, and configure wkhtmltoimage to wait for that value. This ties capture to page readiness rather than an arbitrary pause. Confirm that the readiness signal is actually set on every relevant path; a signal that never arrives can prevent the expected capture.
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If output remains incomplete, inspect JavaScript diagnostics and reduce the page to a minimal reproduction. Increasing dimensions will not fix a script error or a readiness signal that never occurs.
Do not apply PDF-only smart-shrinking advice
The library setting web.enableIntelligentShrinking is documented as having no effect for wkhtmltoimage. Advice to disable intelligent shrinking for wkhtmltopdf is therefore not a fix for this image renderer. Keep the diagnosis specific to wkhtmltoimage’s screen dimensions, crop, width behavior, page CSS, and render timing. See the upstream library reference.
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Reproduce the issue before changing several settings
- Record the complete invocation or library configuration, the exact input, output format, version, operating system, and build or package source.
- Classify the symptom as bottom clipping, horizontal clipping, or late/incomplete page content.
- Make the one corresponding change: height/crop, width/crop/CSS, or readiness timing.
- Capture again and compare the same region. Keep the previous command and output so you can tell whether the change helped.
- If dimensions still differ unexpectedly, reproduce with the same binary and environment before attributing the behavior to the page or a particular option.
A historical upstream issue describes sizing differences between Linux and Windows for wkhtmltopdf 0.12.1 with patched Qt. It is adjacent evidence, not proof of a wkhtmltoimage defect or a guarantee that platform differences explain a particular case. It does make version, operating system, and build details useful when comparing results: upstream issue 3241.
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