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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Most Crawl4AI screenshot failures can be isolated to one stage: the Playwright browser is not installed or cannot launch, the page is not ready when captured, full-page stitching runs into an unbounded document, or the site serves a bot-check page instead of the requested content. Start with a minimal crawl in the same environment that fails, inspect result.error_message and the length of result.screenshot, then change only the settings for the failing stage.
Know which part failed
Crawl4AI separates browser startup from capture. BrowserConfig controls the engine, executable, viewport, device scale, proxy and launch behavior. CrawlerRunConfig controls whether a screenshot is requested and when or how the page is captured. A valid selector or extraction strategy cannot repair a browser that never launched.
| Symptom | Likely stage | First check |
|---|---|---|
Executable doesn't exist, google-chrome not found, or missing chrome-headless-shell |
Installation, cache, path, or image mismatch | Install the matching Playwright browser in the runtime and record the attempted executable path. |
result.screenshot is empty |
Screenshot option or page readiness | Confirm screenshot=True, add a wait, and test a static URL. |
| Image is white, partially rendered, or missing late-loading images | Rendering timing, viewport, or lazy content | Increase the documented wait and test viewport capture before full-page capture. |
| Image is cut off or full-page capture times out | Page height or scroll stitching | Use force_viewport_screenshot=True, then tune full-page limits. |
| Browser launches but content is a challenge page or altered page | Access or anti-bot response | Save the returned HTML and diagnose the site response separately from browser installation. |
Establish a clean baseline in the failing environment
Run the supported setup inside the same virtual environment, container, CI runner, or hosted notebook that executes your crawler. Installing Chromium on your laptop does not make it available in a separate Docker image.
pip install -U crawl4ai
crawl4ai-setup
python -m playwright install --with-deps chromium
crawl4ai-doctorcrawl4ai-setup installs Playwright and related dependencies. The doctor routine launches a Chromium crawl with screenshot=True; a doctor failure therefore points to the runtime before your application selectors or extraction code.
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Use this smallest useful test. It deliberately uses a visible browser and verbose logging so launch and rendering problems are observable.
import asyncio
from crawl4ai import AsyncWebCrawler, BrowserConfig, CrawlerRunConfig
async def main():
browser = BrowserConfig(
browser_type="chromium",
headless=False,
verbose=True,
viewport_width=1280,
viewport_height=720,
)
run = CrawlerRunConfig(
screenshot=True,
screenshot_wait_for=2.0,
)
async with AsyncWebCrawler(config=browser) as crawler:
result = await crawler.arun("https://example.com", config=run)
print("success:", result.success)
print("error:", result.error_message)
print("screenshot bytes (base64):", len(result.screenshot or ""))
asyncio.run(main())A successful baseline should report success: True and a nonzero screenshot string. Keep this test unchanged while you troubleshoot; add your real URL only after it works.
Repair missing Chromium or executable errors
Install in the runtime, not just during local development
Errors such as Executable doesn't exist and “browser executable not found” mean Playwright cannot start. Repeat the setup commands in the image or worker that actually runs the job. In a multi-stage Docker build, make sure the browser cache created in the build stage is copied into the final stage, or run the install command in the final image.
Align Crawl4AI, Playwright, and the image
Pin the Crawl4AI version and the image tag together. A hosted image can contain a different Playwright revision than your Python environment expects. Crawl4AI issue #503 describes missing Playwright binaries in a hosted environment; issue #875 describes an image searching for google-chrome; issue #2064 describes a 0.9.1 image expecting a headless-shell binary that was not present. These are path and packaging failures, not page-selector failures.
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- Verify the Playwright cache directory exists, is readable, and is not deleted between build and runtime.
- Preserve the complete launch log, including the executable path Playwright attempted.
- If the platform supplies its own Chrome binary, configure Crawl4AI/Playwright to use that exact path instead of assuming automatic detection will find it.
- Do not change screenshot selectors until a plain Chromium launch succeeds.
Docker resource checks
If Chromium starts and then exits, inspect container memory, shared-memory size, and sandbox messages. Give the browser adequate shared memory and memory before changing capture code. A browser process that is killed by the container can look like a random screenshot timeout.
Fix an empty or blank screenshot
Confirm the request is enabled
The capture switch is CrawlerRunConfig(screenshot=True). Browser launch settings belong in BrowserConfig; putting a screenshot option in the wrong object will not enable capture.
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Wait for the page to render
Static HTML may be available immediately while JavaScript applications, fonts, images, and consent dialogs are still changing the page. Start with screenshot_wait_for=2.0, then use the smallest wait that consistently produces the required state. For JavaScript-heavy pages, combine an appropriate page wait or delay_before_return_html with the screenshot wait. Excessive delays increase crawl time for every URL.
Use a static control URL
Run the baseline against https://example.com. If that image is valid but your target is blank, the browser and encoder are working; investigate target-page readiness, redirects, consent overlays, or an access challenge.
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Set a deterministic viewport_width and viewport_height. Device scale factor changes output dimensions and memory use, so compare the local and failing environments rather than assuming identical pixel sizes.
Capture full pages without cutoffs or runaway waits
First separate a viewport problem from a full-page problem:
run = CrawlerRunConfig(
screenshot=True,
screenshot_wait_for=2.0,
force_viewport_screenshot=True,
)If the viewport image is correct, tune the full-page controls instead of reinstalling the browser.
Control page height and scrolling
screenshot_height_thresholddetermines when a document is treated as tall enough for full-page handling.scan_full_pageenables the full-page scan/stitching behavior.scroll_delaygives lazy-loaded content time to appear after each scroll.max_scroll_stepscaps work on pages that continually grow.
Very tall feeds, infinite-scroll pages, and pages that append content while you scroll may never reach a stable bottom. Cap the scroll steps or capture bounded sections. Reserve full-page output for pages with a practical height limit; use viewport captures for monitoring.
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When local works but CI or Docker fails
Re-run the minimal test inside the failing environment and compare these values:
- Crawl4AI, Playwright, and browser-engine versions.
- Installed executable path and image tag.
- Viewport width, viewport height, and device scale factor.
- Proxy, custom headers, user agent, and network policy.
- Container shared memory, available memory, and sandbox configuration.
Record the exact Playwright error text, not only a generic job failure. A reproducible health-check URL and pinned image make dependency changes detectable before production crawls are affected.
Distinguish an access challenge from a screenshot-engine failure
A browser can launch normally yet receive a CAPTCHA, bot-check page, login wall, or an intentionally altered response. In that case result.screenshot may be valid while showing the wrong page. Save the returned HTML, final URL, and screenshot and inspect what the server actually delivered.
For legitimate access testing, the Crawl4AI undetected-browser guidance suggests headful mode, reasonable waits, simulate_user, magic, and, where justified, the undetected adapter. These techniques consume more resources and cannot guarantee access. Always respect robots.txt and the website’s terms of service.
Use a configuration split you can reason about
| Concern | Configuration | Examples |
|---|---|---|
| Browser launch | BrowserConfig |
Chromium versus another engine, headless mode, viewport, device scale, proxy, extra arguments, stealth. |
| Capture and readiness | CrawlerRunConfig |
screenshot, screenshot wait, page wait, delay before HTML, viewport/full-page mode, scroll limits. |
Keeping this split makes diagnosis mechanical: launch errors require environment or BrowserConfig work; blank or incomplete images require readiness and capture settings in CrawlerRunConfig.
Build a stable production pattern
- Keep a small health-check URL and run it after every dependency or image change.
- Log
result.success,result.error_message, browser/image versions, viewport dimensions, and whether a screenshot string was returned. - Use deterministic viewport and device-scale settings so image dimensions are comparable between workers.
- Set a nonzero screenshot wait only for pages that need it; unnecessary delay multiplies operating cost.
- Prefer viewport captures for monitoring and bounded full-page captures for documents whose height is known.
- Retain the exact failing Playwright launch message when escalating a CI or Docker issue.
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import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
Does an empty screenshot string prove the target page was empty?
No. It can also mean capture was disabled, the page was not ready, or the browser failed before encoding. Compare result.success, error_message, and a static control URL.
Should headless mode stay disabled in production?
No. Use headless=False while diagnosing so launch and rendering are visible, then return to headless operation once the baseline is stable.
Why can a valid image still be the wrong content?
The server may have returned a bot-check, login page, or other altered response. Inspect the final URL and HTML; this is an access problem rather than a screenshot-encoding problem.
What is the safest way to handle an infinite-scroll page?
Use viewport capture or a bounded number of scroll steps. A page that keeps appending content has no reliable full-page endpoint.
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What should a CI health check assert?
Assert a successful crawl, a nonempty screenshot string, and the expected viewport dimensions, and retain the exact error message on failure.
Frequently Asked Questions
Does an empty screenshot string prove the target page was empty?
No. It can also mean capture was disabled, the page was not ready, or the browser failed before encoding. Compare result.success, error_message, and a static control URL.
Should headless mode stay disabled in production?
No. Use headless=False while diagnosing so launch and rendering are visible, then return to headless operation once the baseline is stable.
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Why can a valid image still be the wrong content?
The server may have returned a bot-check, login page, or other altered response. Inspect the final URL and HTML; this is an access problem rather than a screenshot-encoding problem.
What is the safest way to handle an infinite-scroll page?
Use viewport capture or a bounded number of scroll steps. A page that keeps appending content has no reliable full-page endpoint.
What should a CI health check assert?
Assert a successful crawl, a nonempty screenshot string, and the expected viewport dimensions, and retain the exact error message on failure.
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