Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Set the requested image width with --width: wkhtmltoimage --width 1280 input.html output.png. If the page still lays out at a narrow responsive breakpoint, also try an appropriate --viewport-size; it controls the emulated window or viewport, not the requested capture width. The exact result can vary by installed build and page.
Set the image capture width with --width
Pass the width in pixels as an integer. For example, to request a 1280-pixel-wide capture:
wkhtmltoimage --width 1280 input.html output.pngReplace input.html with your HTML file or supported input and output.png with the desired output path. The official usage documentation lists width among the image options: wkhtmltoimage usage documentation.
When to set the viewport too
--width requests the image capture width. --viewport-size WIDTHxHEIGHT emulates window or viewport dimensions for cases such as custom scrollbars or CSS overflow. If a page’s CSS responds to viewport width, its layout may remain narrow even when you request a wider capture. In that case, test a viewport suited to the intended layout:
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wkhtmltoimage --width 1280 --viewport-size 1280x900 input.html output.pngThis is a diagnostic example, not a guarantee that every build will produce a file exactly 1280 pixels wide or that width and viewport must always match. The option descriptions are in the official usage documentation.
| Option or approach | What it affects | When to consider it | Qualification |
|---|---|---|---|
--width <integer> |
Requested image capture width | The generated image is too narrow | Listed in official usage documentation; verify behavior in your installed build. |
--viewport-size WIDTHxHEIGHT |
Emulated window or viewport dimensions | Layout depends on viewport size, custom scrollbars, or CSS overflow | Its purpose differs from capture width; exact behavior may depend on the build. |
xvfb with --use-xserver |
Display or screen resolution in a particular legacy Linux setup | Only when that setup depends on real X server screen dimensions | Suggested in a 2014 maintainer discussion, not confirmed as a general current fix: historical issue discussion. |
Why a wider capture may still look narrow
- Responsive CSS: The page may choose a narrow layout based on its emulated viewport. Try
--viewport-sizewith dimensions that correspond to the layout you want. - Overflow or custom scrollbars: These are among the documented reasons to set viewport dimensions.
- Build differences: Check the installed binary’s help and version, then verify the output dimensions and page layout. The upstream project is archived and read-only since January 2, 2023, so behavior should not be assumed identical across downstream packages or forks: upstream repository.
Troubleshoot a width that does not change
- Confirm the option is available. Run
wkhtmltoimage --helpand inspect the installed build’s options. - Set
--widthexplicitly. Put the desired integer width in the command, as in the 1280-pixel example above. - Check the page’s responsive layout. If it still appears to use a narrow breakpoint, test
--viewport-sizewith a suitable width and height. - Inspect the output itself. Check the actual image dimensions and content rather than assuming the requested value was honored exactly.
- Account for legacy Linux display behavior only when relevant. A maintainer reported in 2014 that Linux headless mode then used a hard-coded 800×600 screen, distinguishing viewport size from screen resolution. The discussion mentioned xvfb and
--use-xserverfor that setup; it is historical guidance, not a universal requirement for current packages. See the 2014 issue discussion.
Or skip the browser setup
If you need screenshots through an API rather than configuring a local renderer, ScreenshotNeo takes a URL in one GET request and can return PNG, JPEG, WebP, or PDF. For example, using cURL:
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