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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteIf an HTMLCSStoImage capture has the wrong size, first separate the page’s CSS layout dimensions from the output file’s pixel dimensions. Set viewport_width and viewport_height together to control the browser viewport; check device_scale if the image file has more pixels than expected. For an image that is too tall or shows the wrong region, inspect full-page capture and cropping settings.
Set both viewport dimensions for the intended layout
The viewport is the browser’s visible area, measured in CSS pixels. Its width determines which responsive CSS breakpoints apply, while its height sets the visible vertical area for a normal viewport capture. HTML/CSS to Image documents a default viewport of 1920 × 1080 and a maximum viewport width of 6000 pixels; the maximum height is not stated in the reviewed documentation. See the Viewport Params documentation.
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Supply both dimensions in the same request. For example, this JSON describes a desktop layout viewport measuring 1200 × 630 CSS pixels:
{
"url": "https://example.com",
"viewport_width": 1200,
"viewport_height": 630
}If only one dimension is supplied, that is not the documented method for setting the viewport. Add the missing dimension and request the capture again.
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Check device scale when the file has too many pixels
Viewport dimensions control the CSS layout area; they do not necessarily equal the image’s pixel dimensions. HTML/CSS to Image’s FAQ says images render at 2× by default. If the viewport is correct but the output image is twice as wide and high in pixels as you expected, set device_scale to 1 for 1× output. This changes the rendered pixel resolution without changing the CSS viewport. The documented device_scale range is 0.1 to 3.
{
"url": "https://example.com",
"viewport_width": 1200,
"viewport_height": 630,
"device_scale": 1
}Use device_scale to change output resolution, not to make a responsive page adopt a different layout. For a different layout breakpoint, change the viewport width.
Use mobile viewport behavior when you need a mobile layout
Choose the intended mobile width and height, then set viewport_mobile to true if the page should use mobile viewport behavior, including its <meta name="viewport"> settings. The flag does not choose the dimensions; the width and height do.
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{
"url": "https://example.com",
"viewport_width": 390,
"viewport_height": 844,
"viewport_mobile": true
}If a page still looks like its desktop design, verify the requested width first, then check whether mobile viewport emulation is enabled when needed.
Find out why the captured region is unexpectedly tall or cropped
Full-page capture
With full_screen: true, the service captures the full scrollable page. The resulting image can be taller than viewport_height; that does not necessarily mean the viewport was ignored. Turn full-page capture off when you want only the viewport’s visible area. See the full-screen parameter documentation.
Element capture
To capture one component rather than the whole visible page, use the selector parameter to target the element. Check that the selector matches the intended element and that the element is present when rendering occurs. The parameter reference lists available parameters.
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Small standalone HTML snippets
If you are rendering a compact HTML graphic and want it tightly trimmed, size the content in CSS rather than setting explicit viewport dimensions. The viewport documentation notes that explicit dimensions disable automatic cropping and return the area rendered inside the viewport.
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The API’s width and height query parameters resize the generated image after rendering. They do not change the viewport or rerender the page at a different CSS layout size. Use viewport settings to fix responsive layout; use output resizing only when the rendered image is right and you specifically want a different final image size. Parameter behavior is described in the API documentation.
Check render timing only when content is missing
If the dimensions are correct but JavaScript-built content, text, or images are absent, investigate readiness rather than viewport geometry. The parameter reference describes ms_delay as a wait before generation, which can help allow JavaScript to run, and lists render_when_ready for pages that call ScreenshotReady(). These settings address content readiness, not image dimensions.
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Troubleshooting checklist
- Wrong responsive layout: set both
viewport_widthandviewport_heightto the desired CSS viewport size. Use a width at the breakpoint you want. - Output pixels are larger than expected: check the default 2× rendering and set
device_scaleto1if you want 1× output. - Mobile layout is not taking effect: use mobile-sized viewport dimensions and set
viewport_mobiletotruewhen mobile viewport behavior is needed. - Image is taller than the viewport: check whether
full_screen: trueis capturing the scrollable page. - Only a component should appear: target it with
selector; for a small standalone graphic, size the HTML content in CSS and avoid explicit viewport dimensions if automatic trimming is desired. - Content is missing, not mis-sized: check
ms_delayorrender_when_readyas appropriate.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. One GET request can return a PNG, JPEG, WebP, or PDF; the request below saves a WebP screenshot. See the ScreenshotNeo documentation for API options.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpScreenshotNeo accepts cookie banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify page verdict and billing status in headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents. The free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots.
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Frequently Asked Questions
What is the default HTMLCSStoImage viewport?
The vendor’s viewport documentation lists 1920 × 1080 as the default viewport.
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What is the maximum viewport width?
The documented maximum viewport width is 6000 CSS pixels; the reviewed documentation does not state a maximum height.
Does setting viewport dimensions change the responsive breakpoint?
Yes. The viewport width determines which responsive CSS media queries apply; changing only output image size does not.
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