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To capture a website screenshot with Selenium in a serverless function, package a compatible Chrome browser and ChromeDriver, start Chrome with --headless, send the page request through WebDriver, wait for the content you need, set the viewport, and save or upload the screenshot before the invocation ends. For AWS Lambda, give Chrome writable temporary storage such as /tmp, and test the packaged browser in the actual Lambda runtime; local success alone does not establish cloud compatibility.
Build a minimal Selenium capture
The Python example below shows the core flow: configure Chrome, navigate, wait for a meaningful page condition, size the viewport, and save a viewport screenshot. It assumes Selenium, Chrome, and a compatible ChromeDriver are already available in the runtime. The Chrome binary path and driver setup are deployment-specific, so configure them for the exact artifacts you package.
Python example
import os
from pathlib import Path
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.ui import WebDriverWait
URL = "https://example.com"
OUTPUT = "/tmp/page.png"
options = Options()
options.add_argument("--headless")
options.add_argument("--window-size=1440,1000")
options.add_argument("--user-data-dir=/tmp/chrome-profile")
options.add_argument("--disk-cache-dir=/tmp/chrome-cache")
# Set this when Chrome is not installed at its default location:
# options.binary_location = "/opt/chrome/chrome"
driver = webdriver.Chrome(options=options)
try:
driver.set_page_load_timeout(60)
driver.get(URL)
WebDriverWait(driver, 30).until(
EC.presence_of_element_located((By.TAG_NAME, "body"))
)
# Replace the body check with an application-specific ready marker
# when the page renders important content after initial navigation.
Path(OUTPUT).parent.mkdir(parents=True, exist_ok=True)
if not driver.save_screenshot(OUTPUT):
raise RuntimeError("Chrome did not save the screenshot")
finally:
driver.quit()
print(OUTPUT)This captures the current viewport, not a guaranteed full-page image. Change the URL, viewport dimensions, readiness condition, and output location to suit the workload. For a production endpoint, return the image bytes or upload the file to durable object storage before the function returns.
Package browser and driver together
Install or package a Chrome binary and a ChromeDriver compatible with that binary. Pin and update them as a pair. Chrome’s documented Selenium headless mode uses --headless; since Chrome 112, headless and headful modes share the main Chrome implementation. The old headless implementation became a separate chrome-headless-shell binary starting with Chrome 132.0.6793.0, so instructions that refer to the older implementation may not match a current Chrome package. See Chrome for Developers’ headless mode documentation.
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If Chrome is installed somewhere other than its default path, set options.binary_location. Direct its profile and cache to writable scratch storage. Older Lambda examples use /tmp, but validate flags against the modern Chrome build you selected rather than copying legacy flags wholesale.
Choose a readiness condition and capture scope
Wait for the page content you need
A successful navigation does not necessarily mean the page is visually ready. Use an explicit Selenium wait for an element or application-specific marker that indicates the relevant content has appeared. If a page depends on client-side rendering, waiting only for the document body may be insufficient. Keep waits bounded, and handle navigation timeouts and missing elements as capture failures rather than relying on one fixed sleep for every site.
Chrome’s command-line --timeout option applies to the command-line screenshot workflow; it does not define a Selenium readiness strategy. Selenium code should set its own page-load timeout and use explicit waits appropriate to the target page. Chrome’s command-line documentation also describes --screenshot and --window-size, but those CLI flags are not Selenium API calls. See the Chrome headless command-line documentation.
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Set viewport before saving
Set the window size before capture so the page lays out at the intended viewport. A standard Selenium save_screenshot call captures the visible browser viewport; do not assume it creates a full-page image. If you need full-page output, select a Chrome/Selenium technique for that purpose and validate it against the exact browser version and page behavior you deploy.
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For Lambda, use a deployment artifact, layer, or container image that contains compatible browser components and any required runtime dependencies. Browser startup consumes CPU and memory, and Lambda allocates CPU in proportion to configured memory. The platform limits documented by AWS are ceilings, not a promise that a particular Chrome build will fit or run at a particular setting. AWS’s quota documentation, accessed October 3, 2026, lists these standard limits:
| Lambda setting or package | Documented limit |
|---|---|
| Maximum standard invocation duration | 900 seconds (15 minutes) |
| Function memory | 128 MB to 10,240 MB |
| ZIP package contents, unzipped, including layers | Up to 250 MB |
| Container image package, uncompressed | Up to 10 GB |
These are AWS platform quotas, not recommended Chrome settings. Choose memory, timeout, package format, and output handling based on the browser binary, dependencies, page weight, and capture volume. Consult AWS Lambda quotas for current limits.
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Use writable temporary storage
Chrome needs writable space for its profile and cache. Lambda’s /tmp directory is unique to an execution environment and is temporary, so it is suitable for browser working files but not a durable screenshot archive. AWS documents configurable ephemeral storage from 512 MB to 10,240 MB, adjustable in 1-MB increments; data is encrypted at rest with an AWS-managed key. Allocate space for the browser’s working files as well as the image and any concurrent activity. See AWS Lambda ephemeral storage.
Persist the screenshot before returning
Save to /tmp during capture, then return the image through your invocation’s response mechanism or upload it to object storage if it must outlive the execution environment. A historical AWS Lambda Selenium example stores screenshots in S3 under a run-specific prefix, illustrating the persistence pattern rather than requiring a particular storage service. Its Chrome 60, ChromeDriver 2.33, and Java 8 setup is dated and should not be copied as current configuration. See the historical AWS Lambda Selenium example.
Test, troubleshoot, and tune the function
Common failures and fixes
- ChromeDriver cannot start Chrome or reports a session-creation error: check that the driver matches the packaged Chrome binary and that the configured binary path is correct. Update and pin both artifacts together.
- Chrome exits immediately or reports an unwritable profile: direct profile and cache paths to writable temporary storage, such as Lambda’s
/tmp, and confirm the function has sufficient temporary storage configured. - The screenshot is blank or misses dynamic content: replace a generic body wait with a wait for the actual content or readiness marker. Check whether the page needs more time after navigation, while keeping the wait bounded.
- The function times out: separate browser startup, navigation, readiness waiting, and upload time when diagnosing the invocation. Reduce unnecessary work or increase the configured timeout within the platform limit; do not treat the maximum timeout as a target.
- The screenshot is cropped: confirm the requested viewport and remember that the basic Selenium screenshot call captures the visible viewport. Use and test a full-page capture technique if the full document is required.
- The browser works locally but fails in Lambda: validate the packaged artifact, Linux dependencies, writable paths, memory, and startup behavior in the actual cloud runtime. Local and cloud environments differ.
Performance and reliability choices
Browser launches and page loads are workload-dependent; no single memory size, wait duration, or storage allocation is reliable for every site. Measure representative pages in the deployed runtime, including slow or script-heavy pages, and set explicit upper bounds for navigation and readiness. Keep screenshots out of ephemeral storage when they need durable retention, and define how failed captures and uploads are reported to the caller.
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Older AWS tutorials can help explain packaging concepts, but their concrete versions and settings are historical: one uses Chrome 60 and ChromeDriver 2.33, and another uses Python 3.6. Treat them as illustrations, not current deployment recipes. See the AWS Startups Lambda Chromium tutorial.
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Cloud Run for a container-based workflow
Google Cloud documents installing Chromium in a container and lists web-page screenshots as a headless-browser use case. Its guidance names Puppeteer, Playwright, and Chrome DevTools Protocol, not a Selenium recipe; Selenium-specific behavior therefore needs validation in the selected image. Cloud Run is worth considering when container-based browser packaging better suits the workflow. See Google Cloud Run browser automation documentation, updated September 30, 2026.
CloudWatch Synthetics for recurring monitoring
For scheduled synthetic monitoring rather than a custom on-demand screenshot endpoint, AWS CloudWatch Synthetics supports Node.js and Python canaries using Selenium WebDriver and Chrome, saves screenshot artifacts, and supports schedules as frequent as once per minute. AWS documents Chrome as the supported browser for Selenium canaries. This is a managed canary workflow; choose it when monitoring is the goal and its workflow fits, rather than assuming it replaces arbitrary Lambda application logic. See AWS CloudWatch Synthetics canaries.
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Frequently Asked Questions
Can I use the Chrome command-line –screenshot flag from Selenium?
No. Chrome’s –screenshot flag is a command-line capture option; Selenium captures through WebDriver methods such as save_screenshot.
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No. The example’s save_screenshot call captures the visible viewport. Full-page capture requires a separate technique validated for the Chrome version and page.
Can Lambda /tmp store screenshots permanently?
No. Lambda’s /tmp is temporary and specific to an execution environment; upload screenshots that must persist to durable storage before the invocation ends.
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