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Use a headless browser for unattended automation in CI, containers, and servers; use a headful (or headed) browser when you need to watch a session, inspect the page, or debug interactively. For reliable teams, keep both: run the normal pipeline headless, then reproduce failures headed with the same browser, viewport, and user context.
What headless and headful mean
A headless browser runs without displaying a browser window. A headful browser displays the browser UI, so you can watch pages load and interact with them directly. The underlying distinction is whether the session has a visible window—not whether the browser is capable of rendering a page.
Both Playwright and Puppeteer launch headless by default. In either, set headless: false to launch a visible browser. Exact behavior can depend on which browser binary or channel you choose, particularly with Chrome’s distinct headless-shell option.
When to choose each mode
Choose headless for routine automation
Headless is usually the simplest fit for CI agents, containers, servers, scheduled jobs, screenshots, PDF generation, and unattended end-to-end tests. It avoids the need to manage a visible desktop session. Playwright documents headless browser execution in CI, and Chrome describes headless execution for servers, containers, and CI/CD.
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Headless is a practical default for repeatable pipeline runs, but it is not automatically faster or more reliable for every workload. There is no broadly applicable official speed or memory figure for headless versus headful. Measure the specific browser binary and environment you plan to use.
Choose headful for development and diagnosis
A visible browser is useful while authoring tests, investigating selectors, inspecting layout, or stepping through an interaction. Playwright’s debugging tools include its Inspector, slowMo, and the DEBUG=pw:api environment variable; headed mode lets you watch the resulting actions.
Headful can also help investigate failures involving viewport size, fonts, GPU behavior, extensions, permissions, or user-context details. A headed reproduction is most informative when it matches the failing run’s browser channel, viewport, dependencies, and user context. If those differ, the comparison may point to an environmental difference rather than the mode itself.
Do headless and headful Chrome behave the same?
For modern Chrome, Google says, “Chrome now has unified Headless and headful modes.” Since Chrome 132, the older headless implementation is available as a separate chrome-headless-shell binary. So the answer depends on the binary: modern unified Chrome headless is much closer to headed Chrome than the older, separate shell implementation.
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Playwright’s browser guide distinguishes its regular Chromium build, used for headed operations, from a separate Chromium headless shell used by default in headless mode. It also documents selecting the chromium channel to use new headless mode—the real Chrome browser—which it describes as “more authentic, reliable, and offers more features.” Check your framework’s browser selection and channel rather than assuming every headless run uses the same implementation.
Puppeteer’s three practical choices
- Modern headless Chrome: Puppeteer’s default headless mode.
- Headful Chrome: Set
headless: falseto show the browser window. - Headless shell: Set
headless: 'shell'to use the separate shell when its narrower feature set is acceptable and measured throughput is important.
Puppeteer describes the shell as performance-oriented when the full Chrome feature set is unnecessary. That is a qualitative qualification, not a general promise that it will outperform headful or modern headless Chrome for your application.
How to run headed browsers in CI
On Linux, a headed browser needs a display. Playwright’s CI documentation notes that headed Linux execution requires Xvfb, a virtual display server. If the job does not provide a display server, use headless mode or configure Xvfb for the headed run.
For everyday CI, keep the suite headless. When a failure needs visual inspection, run the smallest reproducer headed in an environment with a display server and preserve the failing run’s browser channel, viewport, dependencies, and user context. This separates useful visual diagnosis from changes that could make the reproduction unlike the original failure.
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A practical workflow for debugging mode-specific failures
- Keep artifacts from the failing headless run. Retain traces, screenshots, video, console logs, and network logs so you can see what the browser did without rerunning immediately.
- Reduce the failure. Create the smallest test or script that still reproduces the issue; a focused reproducer is easier to compare than a full end-to-end suite.
- Match the environment. Use the same browser channel or binary, viewport, fonts, dependencies, permissions, and user context. Record which headless implementation is selected.
- Run the reproducer headed. Use the visible session to inspect page state and interaction timing. In Playwright, the Inspector,
slowMo, andDEBUG=pw:apican help make actions and API calls easier to follow. - Compare evidence, not just outcomes. Look at screenshots, traces, console output, and network activity. A test that passes headed and fails headless does not by itself prove headless mode is the cause; binary, display, timing, or environment differences may be responsible.
- Return the fix to the pipeline mode. Validate the final test in the same headless setup used by CI so a local headed-only pass does not mask a pipeline failure.
What to compare before choosing
| Decision factor | Question to ask | Practical implication |
|---|---|---|
| Environment | Will this run on a developer desktop, in CI, or in a container? | Unattended server and pipeline jobs generally fit headless; headed Linux jobs need a display server such as Xvfb. |
| Browser fidelity | Are you using modern unified Chrome headless or a separate shell binary? | Confirm the actual channel or binary; “headless” does not identify a single implementation. |
| Observability | Do you need to see the interface, inspect state, or slow actions down? | Use headed mode for hands-on diagnosis; use traces and other artifacts to inspect unattended runs. |
| Reproducibility | Are browser channel, viewport, fonts, dependencies, and user context held constant? | Keep them aligned when comparing modes, or an environmental difference can confuse the diagnosis. |
| Throughput and cost | Has the exact workload been measured with the intended binary and runner? | There is no general official headless-versus-headful benchmark; test the workload rather than assuming a percentage gain. |
Performance, reliability, and cost considerations
Headless often reduces display-management work because it does not need a visible desktop session. That operational convenience is different from a guaranteed reduction in execution time, memory use, or infrastructure cost. No broadly applicable official benchmark establishes those savings across browser workloads.
If throughput matters, benchmark the exact tests, browser build, and CI environment you will run in production. A headless shell may be worth evaluating when its reduced feature set is acceptable; if browser fidelity is the priority, modern unified Chrome headless is the more relevant comparison. Keep the chosen binary consistent between benchmark and deployment.
For reliability, make the pipeline’s mode explicit and capture artifacts on failure. A headed local run is useful for observation, but it is not a substitute for validating the final test in the headless mode and environment used by CI.
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Common problems and fixes
Headed Linux launch fails in CI
Likely cause: The runner has no display server. Fix: Run headless, or provide Xvfb for the headed Linux job.
The test passes headed but fails headless
Likely cause: The runs may not use the same browser binary, channel, viewport, dependencies, fonts, or user context. Fix: Align those conditions and inspect traces, screenshots, console output, and network logs before attributing the difference to browser mode.
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Likely cause: The framework may be using a headless shell rather than modern unified Chrome. Fix: Check the browser-selection setting. In Playwright, its browser guide documents the chromium channel for new headless mode; Puppeteer documents headless: 'shell' as a distinct choice.
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Likely cause: The workload, browser binary, or display setup differs, and there is no universal official comparison figure to resolve it. Fix: Benchmark the same workload under controlled conditions, including the same runner and browser implementation.
Frequently asked questions
Should Playwright run headless or headed?
Use headless for the normal unattended CI run and headed for local development or visual debugging. Playwright launches headless by default; set headless: false when you need a visible browser.
Is headless Chrome faster?
Not as a universal rule supported by a general official benchmark. Puppeteer describes headless shell as performance-oriented when the complete Chrome feature set is unnecessary; measure your own workload before choosing it.
Why does headed CI need extra setup on Linux?
A headed session needs a display. Playwright’s CI guidance says Linux headed execution requires Xvfb; an ordinary headless run does not need a visible desktop session.
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