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Choose how to render the HTML
The key decision is where the browser runs. With Playwright, your Python process launches a browser and controls the page. That gives you direct control of the page and capture, but you are responsible for the browser runtime and its lifecycle. A hosted service renders remotely, which can avoid local browser setup but introduces an API credential, network dependency, and reliance on the provider’s service and terms.
| Approach | Input | Capture controls documented | Operational dependency |
|---|---|---|---|
| Playwright for Python | HTML loaded into a page, or a page opened by URL | Viewport, full page, element, image bytes, output format and related options | Python library and a browser installation; Playwright documents Chromium, Firefox, and WebKit |
| html2img hosted API | Supplied HTML or a publicly accessible URL, depending on endpoint | Width, height, full page, device pixel ratio, CSS injection, and waiting for a selector | Network access, API key, and the provider’s service |
The available documentation does not establish a measured winner for speed, cost, image fidelity, privacy, or reliability. Choose based on where you can run the browser, what input you have, and which operational responsibilities suit your project.
Render HTML locally with Playwright
Playwright’s screenshot guide documents a Python API that saves a browser capture to a file. This synchronous example renders markup provided by the script:
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from playwright.sync_api import sync_playwright
html = """
Hello from Python
This HTML was rendered in a browser.
"""
with sync_playwright() as p:
browser = p.chromium.launch()
page = browser.new_page()
page.set_content(html)
page.screenshot(path="output.png")
browser.close()The result is a PNG in the current working directory. The example uses Chromium; Playwright’s Python library also documents Firefox and WebKit, and provides both synchronous and asynchronous APIs. For current installation and browser setup steps, follow the official Playwright Python library guide; commands and system requirements can vary by environment.
Capture an existing page by URL
For a public site or a locally running web application, navigate the page before capturing it. This example waits for the page’s load event, but that event alone does not guarantee every site-specific asynchronous task or late-loading asset has finished.
from playwright.sync_api import sync_playwright
with sync_playwright() as p:
browser = p.chromium.launch()
page = browser.new_page(viewport={"width": 1440, "height": 900})
page.goto("https://example.com", wait_until="load")
page.screenshot(path="page.png")
browser.close()Use the URL of your own page in place of the example address. For a local app, start the app first and navigate to its local address. If the page relies on JavaScript, remote fonts, images, or other external resources, decide what “ready” means for that page before capturing. No single wait condition is a guarantee for every site; the screenshot documentation describes capture operations, not a universal readiness rule.
Choose what to capture
Visible viewport
A plain page.screenshot(...) captures the current viewport. Set the viewport when opening the page if the output needs a predictable layout. The rendered page may differ at different viewport sizes because responsive CSS can rearrange or hide content.
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Full scrollable page
Pass full_page=True to capture beyond the visible viewport:
page.screenshot(path="full-page.png", full_page=True)This produces a tall image of the full scrollable page. On pages with lazy-loaded content, simply requesting a full-page screenshot may not trigger every asset or section to load as it would during a visitor’s scroll. Check the resulting image for missing content and use page-specific preparation where needed.
One element
When only a chart, card, or other region is needed, take a screenshot of a locator rather than the whole page:
page.locator(".report-card").screenshot(path="card.png")Replace .report-card with a CSS selector matching the element you intend to capture. The locator must resolve to the intended element in the rendered page. If the selector matches nothing, or the element is not ready, the capture cannot produce the intended result.
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Image bytes instead of a file
The screenshot methods can return image bytes when no path is supplied. That is useful when you want to send the image to another service or process it without first writing a file:
image_bytes = page.screenshot()
# Pass image_bytes to your image-processing or upload code.Use the returned bytes as binary image data; do not decode them as text. If a downstream step expects a particular format, set that format explicitly rather than relying on a filename extension.
Set the image format and appearance
The current Playwright Page API documentation describes PNG, JPEG, and WebP screenshot output. PNG is the documented default. A file path’s extension can determine the format when the format option is not supplied. JPEG’s documented default quality is 80; WebP quality 100 is lossless, while lower values are lossy. These API options are version-sensitive, so confirm them against the reference for the Playwright version installed in your project.
# JPEG with an explicit quality setting
page.screenshot(path="preview.jpg", type="jpeg", quality=85)
# WebP with an explicit quality setting
page.screenshot(path="preview.webp", type="webp", quality=90)Quality applies to JPEG and WebP, not PNG. Choose a format based on the destination: PNG is a common choice for sharp text and graphics; JPEG and lossy WebP can reduce file size at the cost of image detail or artifacts.
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Scale, transparency, and masks
The Page API also documents scale controls for CSS-pixel or device-pixel output, an option for a transparent background, and screenshot masks. A higher device-pixel scale can create a larger raster image; the exact dimensions depend on the rendered page and selected capture scope. Transparency is useful when the page background should not be included. Masks can cover selected areas in a capture. Consult the Playwright Page API reference for the exact option names and behavior in your installed version.
Use a hosted renderer instead
If you prefer not to launch and manage a browser in the Python process, html2img documents a hosted API. Its getting-started documentation describes POST /api/html for supplied markup and a screenshot endpoint for valid, publicly reachable URLs. Requests require an API key. The documented controls include dimensions, full-page capture, device pixel ratio, CSS injection, and waiting for a selector; the service also identifies sync and async Python client APIs. See html2img’s getting-started documentation for its current request format and client details.
A hosted renderer can be useful when browser execution does not belong in your application environment. Before adopting one, assess how your HTML or URLs reach the service, how credentials are handled, and whether the provider’s current terms and operational requirements fit your use case. The available documentation does not establish that a hosted service is inherently cheaper, more private, faster, or more reliable than local rendering.
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ScreenshotNeo is a website screenshot API and MCP server for developers. Send one GET request with a URL to receive a PNG, JPEG, WebP, or PDF. Its capture flow accepts cookie and consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each of those steps can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and response headers report the page verdict and whether the request was billed.
For a public page, this cURL request saves a WebP image:
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpFor the endpoint, authentication, and available parameters, see the ScreenshotNeo API documentation. Replace YOUR_API_KEY with your key and change the target URL as needed. ScreenshotNeo also has an MCP server with take_screenshot, get_page_info, and capture_pdf tools for AI agents using Claude, Cursor, or another MCP client. The free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots.
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Troubleshoot common capture problems
- The browser does not launch: Confirm that Playwright and its browser installation are set up for your environment using the current library guide. The installed Python package alone may not mean the required browser runtime is ready.
- The output is blank or missing expected content: Check that navigation or
set_contentcompleted and that the relevant scripts and assets can load. A page’s load event is not a universal signal that every asynchronous element is ready; wait for a page-specific selector or condition where appropriate. - A full-page shot omits lazy content: Inspect the page’s loading behavior. Lazy images and sections may appear only after scrolling or other interaction, so prepare the page as needed before capture.
- An element screenshot fails or captures the wrong region: Check that the CSS selector identifies the intended element and that it exists in the rendered page at capture time. Use a more specific selector if it matches the wrong element.
- The image is too large or too small: Check the viewport dimensions and screenshot scale. Responsive layout is based on the page’s viewport; device-pixel scaling affects raster output dimensions.
- Transparency or format options do not behave as expected: Check the installed Playwright version’s Page API reference, and explicitly set the format and relevant options rather than relying on an inferred extension or defaults.
- A hosted request is rejected: For html2img, verify the API key and that a URL submitted to the URL endpoint is publicly accessible and valid. Consult the provider’s current docs for endpoint-specific requirements.
Performance, reliability, and cost considerations
With local Playwright rendering, the application is responsible for browser startup, page navigation, waiting for the content it needs, and closing the browser. Reusing a browser process across multiple captures may avoid repeated startup work, but the provided documentation does not quantify any performance gain; manage pages and browser resources deliberately and close them when finished. Capture time also depends on the page and its network resources, so a timeout or wait choice should reflect the content and environment rather than being treated as a guarantee.
A hosted renderer moves browser execution off your machine but adds a network request and service dependency. It also requires credentials and may impose provider-specific requirements. The cited materials do not provide comparable pricing, latency, or reliability measurements, so estimate those against your own workload and the vendors’ current terms rather than assuming one route will cost less.
Frequently asked questions
Can Python convert HTML that is not hosted online?
Yes. With Playwright, provide the markup to a page using page.set_content; the browser does not need a public URL for that workflow. A hosted URL-capture endpoint, by contrast, requires a publicly reachable URL according to html2img’s documentation, while its HTML endpoint accepts supplied markup.
Can I create a PDF instead of an image?
Playwright’s screenshot API is for image captures. ScreenshotNeo’s endpoint can return a PDF, and its MCP server includes a capture_pdf tool; use the service documentation for the relevant request options.
Which method produces better image quality?
The available documentation does not establish a quality ranking between local Playwright rendering and hosted services. In either workflow, output depends on the rendered page, viewport, assets, and capture settings; inspect representative results from your own content.
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