Arc for macOS has a Capture Full Page command. Press Cmd+T to open the Command Bar, type Capture Full Page, and select it. Arc downloads a PNG of the whole page to your default download location. Arc’s help documents this command for macOS only. OpenScreenShot also works in Arc: Arc is a Chromium browser and installs extensions from the Chrome Web Store.

Built-in method

Arc describes the command in How to take full page screen captures in Arc.

  1. Open the page you want to capture.
  2. Press Cmd+T to open the Command Bar, type Capture Full Page, and select it. You can also choose File > Capture Full Page.
  3. Arc downloads a PNG to your default download location.

The command has no default shortcut. To add one, open Arc > Settings > Shortcuts, search for capture, and set a key for Capture Full Page.

For a styled screenshot, turn on Developer Mode and use the screenshot button in the toolbar, or run Capture in Portrait Mode from the Command Bar. Arc’s separate Capture tool takes a selection with editing and Easels, and it is also macOS only.

Limits

  • macOS only. Arc documents no full-page command for Arc on Windows.
  • Undocumented behavior. Arc does not document how it builds the image, its size limit, or how it treats sticky headers. Check the top and the middle of the PNG for a header that is missing or repeated.
  • Markup. Arc does not document editing for full-page captures. To add arrows or text, open the PNG in another app.
  • Lazy loading. Images marked loading="lazy" load only when you scroll near them. Scroll through the page before you capture it, or parts of the image can stay blank.
  • Inner scroll containers. Developers report that full-page captures in Chromium, Firefox, and WebKit show only one screen height of a panel that scrolls inside a fixed-height shell. Check web apps and docs sites with a scrolling content pane.
  • Infinite scroll. A feed that keeps loading has no true bottom. The capture holds only what loaded before you started.

With OpenScreenShot

OpenScreenShot scrolls the page one viewport at a time and stitches the parts into one image. Fixed headers are captured once at the top, and pages that scroll an inner element work too. A page taller than 32,000 device pixels is saved as up to six images.

  1. Open the OpenScreenShot listing in Arc and add the extension. Arc covers Chrome Web Store installs in Extensions in Arc.
  2. Pin the OpenScreenShot icon.
  3. Open the page and click the icon, or press ⌘⇧S. With the default settings, a full-page capture starts and the result opens in the editor.
  4. Check the top, the bottom, and any sticky navigation.
  5. Click Save image and choose PNG, JPEG, WebP, or PDF, or click Copy.

If the icon opens a menu, select Full Page; the One-click Express mode setting controls this. To style the capture in OpenScreenShot, open the Frame panel in the editor: it adds padding, rounded corners, a shadow, and a gradient, solid, or transparent background, and the frame travels into every export. The capture mode reference and the export reference list every option.

Which to use

  • Use Capture Full Page in Arc on macOS for a quick PNG of a page that scrolls the whole window.
  • Use OpenScreenShot on pages that scroll an inner panel, or when you want to mark up, redact, or save the capture as PDF, as in design review.
  • Use OpenScreenShot’s Frame panel for a styled image with your own padding and background, as in screenshots for social media.

The Chrome guide compares Chrome’s DevTools capture with the extension, and the Brave guide covers another Chromium browser with a built-in tool. For pages that block extensions, such as browser settings, see support and known limitations.