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How to Capture Website Screenshots in Dark Mode with ScreenshotAPI

Add dark_mode=true to a ScreenshotAPI request to capture a site’s dark theme. The page must support dark styling; CSS injection offers page-specific adjustments.
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To request a dark-mode capture with ScreenshotAPI, add dark_mode=true to the screenshot request. The page must support a dark theme or include dark-mode styles; the option does not automatically convert every site. If you need page-specific styling, ScreenshotAPI also documents CSS injection before capture.

Make a dark-mode screenshot request

  1. Get an API token from your ScreenshotAPI account dashboard, as described in the API documentation.
  2. Send a GET request to https://shot.screenshotapi.net/v3/screenshot with your token, target page URL and dark_mode=true. Encode the URL as a query parameter.
  3. Open or save the returned capture and check whether the target page actually rendered in its dark theme.

Request shape: https://shot.screenshotapi.net/v3/screenshot?token=TOKEN&url=ENCODED_URL&dark_mode=true. Replace TOKEN and ENCODED_URL with your account token and the encoded page URL. This illustrates the documented parameters; it is not a tested request.

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What dark_mode=true does—and does not do

ScreenshotAPI documents dark_mode as an emulation option with a default of false. Setting it to true asks the renderer to capture the target in dark mode. The result depends on the site: it must offer a dark theme or have built-in dark-mode styles. A page without appropriate styles may remain light or render inconsistently.

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The option is useful when the site already responds to a dark-mode preference. It is not a universal color-inversion filter, so check the output rather than assuming the query parameter guarantees a dark image. ScreenshotAPI’s product page lists dark mode among its request options.

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Adjust a page with CSS when its theme needs help

For a page that needs a particular treatment, ScreenshotAPI documents a css option for injecting CSS before capture. You can use CSS to alter selected page styles, but this requires page-specific judgment: the documentation does not promise automatic, correct dark-theme conversion for arbitrary websites.

Use the dark-mode option first when the target supports a dark theme. Consider CSS injection when you need deliberate styling beyond the page’s own theme behavior. Check the resulting capture for contrast, images, borders, and other elements that custom CSS may affect. See ScreenshotAPI’s CSS and JavaScript injection documentation for the documented customization option.

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Or skip the browser setup: use ScreenshotNeo

ScreenshotNeo is a website screenshot API and MCP server for developers. A single GET request can return an image or PDF; the dark-mode option can request a target’s dark appearance, while CSS can be supplied for more deliberate page-specific styling.

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ScreenshotNeo API documentation

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

ScreenshotNeo removes cookie and consent banners, newsletter popups, and chat widgets before capture, and those steps can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed; response headers report the page verdict and billing status. An MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents and other MCP clients. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000.

Sign up for ScreenshotNeo’s free plan.

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Frequently Asked Questions

Does dark_mode=true work on every website?

No. The target needs a dark theme or built-in dark-mode styles for the option to produce a dark appearance.

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Can CSS injection turn any page into a good dark theme automatically?

No. It allows pre-capture styling, but applying a suitable dark treatment can require page-specific CSS.

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