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How to Capture a Mobile-Width Website Screenshot with CaptureKit

Set CaptureKit’s viewport_width explicitly to capture a site at mobile width; add a height, choose viewport or full-page scope, and tune waits as needed.

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To capture a website at a mobile-width viewport with CaptureKit, send an authenticated GET request to https://api.capturekit.dev/v1/capture with the page’s full URL and an explicit viewport_width in CSS pixels. Set viewport_height as well if the visible vertical area matters. CaptureKit’s documented default width is 1280 pixels, so don’t rely on the default for a narrow capture.

Capture a custom mobile-width viewport

Get an API key from the CaptureKit dashboard, then pass it in the x-api-key header. Choose dimensions that match the browser viewport you want to reproduce; the dimensions below are illustrative, not a required phone size or a claim about a specific device model.

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  1. Choose the target page’s complete URL and the desired viewport width in CSS pixels.
  2. Choose a viewport height if the visible vertical area is important.
  3. Request a format. PNG is the documented default; this example specifies it explicitly.
  4. Run the request and save the response as an image file.
curl -G 'https://api.capturekit.dev/v1/capture' 
  -H 'x-api-key: YOUR_API_KEY' 
  --data-urlencode 'url=https://example.com' 
  --data-urlencode 'viewport_width=390' 
  --data-urlencode 'viewport_height=844' 
  --data-urlencode 'format=png' 
  -o mobile.png

Replace YOUR_API_KEY, the example URL, and the dimensions with your own values. Keep the key private rather than embedding it in public client-side code. See the CaptureKit documentation for the current endpoint reference and supported parameters.

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Choose custom dimensions or a device preset

Choice Use it when What it specifies
viewport_width and viewport_height You know the dimensions you need or want a custom viewport. Numeric browser viewport dimensions in pixels.
device You want one of CaptureKit’s listed device profiles. A named emulation preset; the endpoint documentation lists examples spanning iPhone, iPad, Galaxy, Pixel, Redmi, and Huawei.

These are distinct ways to set the capture environment. An arbitrary numeric width is not, by itself, an exact emulation of a particular phone model. Use a named preset when the documented profile is the target; use dimensions when the viewport size is what matters.

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Decide whether to capture the viewport or the full page

full_page is separate from viewport width and defaults to false. Leave it off to capture the visible viewport, as in the example. Enable it deliberately when you need the entire page rather than only the initial screen. The endpoint also documents scroll-related behavior for loading lazy content during full-page captures.

Adjust format, waiting, and page cleanup

Output format and quality

CaptureKit documents PNG as the default and lists WebP, JPEG/JPG, and PDF as alternatives. The image_quality option is documented for supported lossy image formats. Choose based on how the image will be used: a lossless format can preserve fine interface details, while a lossy format may suit smaller image files. Confirm supported values in the current endpoint reference.

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Wait for the page to render

For pages that render asynchronously, the endpoint lists wait_until choices including domcontentloaded, load, networkidle0, and networkidle2, as well as a delay and wait_for_selector. The appropriate choice depends on how the target page loads; no single setting guarantees that every site will be ready at the same point. Waiting longer can help a late-rendering element appear, but may also increase capture time.

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Target or clean up page content

If you need only part of a page, the docs list an element selector. They also list remove_selectors, remove_ads, resource blocking, and URL blocking. These options change what is captured or loaded; they are not necessary simply to set a mobile-width viewport.

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Troubleshoot common capture problems

  • The result is desktop-width: set viewport_width explicitly. The documented default is 1280 pixels.
  • The top of the page is captured but lower content is missing: decide whether you want the visible viewport or the full page. Set full_page deliberately; it defaults to false.
  • A component is absent or incomplete: the page may render it asynchronously. Try a suitable wait_until option, a delay, or wait_for_selector for the element that needs to appear.
  • The output is not the desired file type: specify a documented format rather than assuming the default. PNG is the documented default; WebP, JPEG/JPG, and PDF are also listed.
  • The request is rejected as unauthenticated: verify that the API key is present in the x-api-key header and that it is the key issued from your dashboard.
  • The capture does not match a specific device: use a supported named device preset if you need that emulation. Custom width and height set dimensions, not an exact model identity.
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Example cURL request (see the ScreenshotNeo API documentation):

curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webp

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