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Use OpenClaw’s browser workflow to open a page, inspect its structured snapshot, and then capture either the visible viewport, the entire page, or a supported element. The essential distinction is that a snapshot exposes a stable AI/ARIA UI tree, while a screenshot records rendered pixels. Start with a snapshot when you need reliable references for controls; take a screenshot when visual layout, styling, or evidence of the rendered page matters.
This guide covers the CLI and browser-agent workflow, capture-scope choices, profile limitations, labels, recovery from timeouts, and a hosted alternative when you do not want to maintain a browser session.
What OpenClaw screenshots capture
OpenClaw exposes browser automation through both its browser agent tools and the openclaw browser CLI. The workflow can open and navigate pages, return structured snapshots, and capture screenshots. The official agent-tools documentation describes a snapshot as a stable UI tree (AI or ARIA), whereas a screenshot is a pixel capture: OpenClaw browser agent tools.
A snapshot is usually the better first inspection step. It gives the agent stable references for buttons, links, fields, and other controls. A screenshot is the right output when you need to review CSS, spacing, responsive behavior, visual regressions, or the exact appearance a visitor sees.
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Prerequisites and browser readiness
You need an OpenClaw installation with browser control configured and a profile selected. If the browser is unavailable, use the documented status or doctor flow before attempting a capture. The CLI quick-start sequence is documented in the Browser CLI reference.
- Check browser status or run the documented doctor/readiness check.
- Select the profile you intend to use.
- Start that profile.
- Open the target URL.
- Request a snapshot before deciding what to capture.
Profiles and backends do not all expose identical capabilities. Review browser profiles when switching between a managed browser, an existing user session, or a node-routed target.
Basic CLI workflow
Open a page and inspect it
After starting your selected profile, open the URL with the browser CLI and request a snapshot. The snapshot gives you references that can be used by later actions and, where supported, by a reference screenshot.
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openclaw browser open https://example.com
openclaw browser snapshotUse the exact profile and startup syntax shown by your installed OpenClaw version if your environment requires an explicit profile flag.
Capture the current viewport
A plain screenshot captures the currently visible page area:
openclaw browser screenshotThis is useful for checking above-the-fold layout, a modal, a logged-in state, or a responsive breakpoint at the current viewport.
Capture the whole page
Use the full-page switch when you need content below the fold:
openclaw browser screenshot --full-page--full-page is a page-capture option. It cannot be combined with --ref or --element, because those options target a specific object rather than the complete document. This constraint is described in the browser control API.
Capture a referenced target
After inspecting a snapshot, pass the relevant reference to the screenshot command:
openclaw browser screenshot --ref e12Replace e12 with the reference returned by your snapshot. This is appropriate for a dialog, product card, chart, or other target represented in the UI tree.
Add labels to the image
When you need the screenshot to show how visual regions map to snapshot references, request labels:
openclaw browser screenshot --labelsLabel overlays and returned annotations depend on the selected profile, browser backend, and Playwright availability. Treat labels as a capability to verify, not a guaranteed identical output across every setup.
Choosing page, full-page, ref, or element capture
| Capture | Use it for | Important constraint |
|---|---|---|
| Viewport page | What is visible now, including responsive layout and overlays | Only the current viewport is included |
| Full page | Long documents, landing pages, and complete visual records | Cannot be combined with --ref or --element |
Reference (--ref) |
A target identified in a snapshot, such as a dialog or card | Requires a usable snapshot reference |
Element (--element) |
A specific element selected by the browser-control implementation | Not available for CSS element screenshots in existing-session/user profiles |
The control reference notes that existing-session or user profiles support page and reference screenshots but not CSS --element screenshots. Exact label behavior and annotations also vary by backend: browser control API.
Agent-tool pattern for reliable captures
- Navigate. Open the URL in the selected browser profile.
- Snapshot. Ask for the stable UI tree and identify the control or region you care about.
- Act if needed. Click, fill, or wait for the state whose appearance you need.
- Capture. Choose a viewport, full-page, reference, or supported element screenshot.
- Label only when useful. Labels help correlate pixels with references, but they can be unavailable or differ by backend.
This sequence avoids guessing selectors from pixels and makes captures repeatable for dynamic pages. It also separates semantic inspection from visual verification, which is useful in test and documentation workflows.
Profile and backend limitations
OpenClaw can stream an active tab in some configurations, but the control UI falls back to screenshots in situations including node-routed browsers, existing-session profiles, missing Playwright, or a stream failure. The documented profile behavior is covered at Browser profiles.
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- Playwright availability: labels and annotations can depend on whether the backend has Playwright support.
- Backend differences: the same command may return different annotation details or streaming behavior on different targets.
- Session state: cookies, authentication, and extensions in a user profile can change what is rendered, so record which profile produced an image.
Troubleshooting common failures
“Browser not reachable” when starting
OpenClaw’s CLI guidance directs you to troubleshoot CDP readiness. Confirm that the selected browser process and its debugging endpoint are running, then repeat the status/doctor check and start sequence. Do not treat a successful CLI invocation as proof that a tab is ready until an open or snapshot request succeeds: Browser CLI reference.
Start and tabs work, but navigation fails
The CLI documentation identifies navigation SSRF policy as a possible cause. Check the configured navigation policy and the target’s address class, then retry with an allowed URL. A browser that can list tabs can still reject a navigation request under that policy.
Screenshot times out
A timeout can occur while OpenClaw is still capturing or restoring browser settings. Wait for the in-progress operation to finish and retry. If the tab remains stuck, close that tab and reopen the URL before capturing again. This recovery sequence is documented in the browser agent-tools guidance: Browser agent tools.
Full-page and target options conflict
Remove either --full-page or the target option. Full-page captures operate on the page; --ref and --element operate on a target and are mutually incompatible with full-page mode.
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Check the profile and backend first. Labels and annotation payloads are capability-dependent, particularly when the browser is an existing session, routed through a node, or running without Playwright. Capture without labels when you only need pixels.
Element capture is unavailable
If you are using an existing-session/user profile, switch to a profile/backend that supports CSS element screenshots, or use a snapshot reference with --ref. If neither is possible, capture the viewport or full page and crop it in a separate image-processing step.
Performance, reliability, and repeatability
- Prefer the smallest scope. Viewport captures are faster and smaller than full-page images; use full page only when below-the-fold content is required.
- Wait for state. Snapshot after navigation and after any interaction that changes the page. Capturing too early commonly produces loading skeletons or incomplete content.
- Keep profiles consistent. The same URL can render differently with different cookies, extensions, viewport sizes, or authentication state.
- Retry safely. After a timeout, wait before issuing another capture; repeated overlapping requests can prolong restoration. Reopen a persistently stuck tab.
- Separate evidence types. Store the snapshot output with the screenshot when you need an auditable link between semantic controls and visual pixels.
- Do not infer statistics. OpenClaw’s documentation does not publish screenshot success rates, timing guarantees, or token savings; plan capacity from your own workload.
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FAQ
Should I take a snapshot or screenshot first?
Take a snapshot first when you need stable control references; take the screenshot after the page reaches the state you want to inspect visually.
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Can I combine a full-page capture with a reference?
No. OpenClaw’s documented control API treats --full-page and --ref/--element as different, incompatible scopes.
Why does the control UI show an image instead of a live stream?
OpenClaw falls back to screenshots for several configurations, including node-routed browsers, existing-session profiles, missing Playwright, and stream failures.
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Can OpenClaw screenshots include authenticated pages?
Yes, when the selected browser profile has the required authenticated session or cookies. The resulting image reflects that profile’s state, so use care when sharing captures.
What should I do if a page keeps changing during capture?
Wait for the page’s loading state to settle, take a fresh snapshot, and capture again. For highly dynamic content, use the smallest scope that proves the point and keep the profile and viewport fixed.
The Bottom Line
For OpenClaw, the dependable pattern is snapshot first, then capture the scope your task requires. Use full-page, reference, and element modes only where the selected profile supports them, and recover from hangs by waiting or reopening the tab. When you need a repeatable hosted endpoint instead of browser setup, ScreenshotNeo provides the one-call alternative with clean-shot billing and an MCP server.
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