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To capture a web app beyond the visible browser window, use Chrome DevTools’ Capture a full size screenshot command or Firefox DevTools’ screenshot button with full-page capture enabled. Navigate to the exact app state first, then inspect the saved image: dynamic content, nested scroll areas, and sticky elements can affect what appears.

Prepare the app screen before you capture it

  1. Open the web app and navigate to the exact screen and state your guide needs to show.
  2. Close menus, dialogs, or other temporary overlays unless they are part of the instructions being documented.
  3. Choose the capture scope: use a full-page screenshot for content extending below the viewport, a viewport screenshot for the current visible area, or an area or element capture for a specific part of the interface.

Capture a full-page screenshot in Chrome

  1. Open the app page in Chrome and open DevTools.
  2. Enable Device Mode using the device toolbar button or the DevTools command menu.
  3. In the Device Mode toolbar, open More options and choose Capture a full size screenshot.
  4. Open the saved image and confirm it includes the content and app state your guide requires.

Chrome documents this command as capturing the whole page, including content outside the viewport. See Chrome DevTools device mode.

Capture only a selected area in Chrome

When a full-page image would include too much surrounding content, open the DevTools Command Menu, type “screenshot,” select Capture area screenshot, and drag over the region to capture. See Chrome’s Command Menu documentation.

Capture a full-page screenshot in Firefox

  1. Open Firefox DevTools settings.
  2. Under Available Toolbox Buttons, enable Take a screenshot of the entire page.
  3. Use the screenshot button in the DevTools toolbar to capture the page.
  4. Check the saved image in Downloads and verify the relevant app content is present.

Firefox also documents a Web Console screenshot command with a --fullpage option. Its documentation covers both full-page and element screenshots: Firefox screenshot documentation.

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Capture one element in Firefox

To document a component rather than the whole page, open the element in the Inspector’s HTML pane, open its context menu, and select Screenshot Node.

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Choose the right capture scope

Capture type Use it when Browser workflow covered here
Full page The guide needs to show page content below the visible window. Chrome Device Mode or Firefox’s enabled screenshot button.
Viewport The instruction concerns only what is visible at the current scroll position. Use a normal visible-screen capture; the cited full-page instructions do not specify a single viewport shortcut.
Selected area You need a cropped region of the page. Chrome Command Menu: Capture area screenshot.
Element You need one DOM component without the surrounding page. Firefox Inspector: Screenshot Node.

Check the result for web-app-specific problems

Full-page commands do not guarantee that every app design will render as intended. Review the actual saved screenshot before adding it to a guide.

  • Missing content: Confirm whether the content is in a nested scroll area rather than the document itself. If it is not included, capture that area or element separately.
  • Repeated sticky headers: A sticky interface element may appear more than once in a long capture. If that makes the image confusing, use several viewport or element screenshots instead.
  • Clipped content: Check the bottom and edges of the image. Capture a smaller area or split the instructions into multiple screenshots if important content is cut off.
  • Changed app state: Dynamic content can change during capture. Recreate the intended state, close transient UI that is not part of the guide, and capture again.
  • Unclear instructions in one image: Use sequentially labeled viewport or element screenshots rather than forcing the whole procedure into one long image.

Do not confuse a screenshot with captured-tab scrolling

Chrome’s Captured Surface Control API applies when a web app has already started capturing a browser tab. Scrolling the captured tab requires user permission; that permission workflow is not needed for the ordinary DevTools screenshot steps above. See Chrome’s captured-surface documentation.

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Browser coverage

The documented workflows here cover Chrome and Firefox. Current Edge and Safari steps are not established by the cited browser documentation, so check those browsers’ current official help before following instructions written for Chrome or Firefox.

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Or skip the browser setup

For a repeatable API capture, ScreenshotNeo returns a screenshot or PDF from one GET request. For example, this cURL command saves a WebP screenshot of Stripe:

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

See the ScreenshotNeo documentation for the API options. ScreenshotNeo accepts cookie banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each cleanup step can be disabled. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and response headers report the page verdict and billing status. Its MCP server includes tools for AI agents to take screenshots, get page information, and capture PDFs. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 shots.

Sign up for ScreenshotNeo’s free plan to get 1,000 screenshots a month with no card.

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Frequently Asked Questions

Where does Firefox save a screenshot taken with its DevTools screenshot button?

Firefox saves the screenshot in Downloads.

Does Chrome’s full-page screenshot workflow require the Captured Surface Control API?

No. That API concerns scrolling a tab that a web app is already capturing; the DevTools screenshot workflow does not require it.

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