The Tool Desk
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Set a screenshot-only background with Playwright’s style option: await page.screenshot({ path: 'shot.png', style: 'html, body { background: #1e293b !important; }' });. For a persistent change, inject the same CSS with page.addStyleTag() before capturing. Use omitBackground: true only when you want transparency, not a solid color.
Choose the result you need
| Goal | Playwright setting | Output |
|---|---|---|
| Change color only for one capture | style |
Temporary CSS applied during the screenshot |
| Keep the color for several actions or captures | page.addStyleTag() |
CSS remains in the page until navigation or removal |
| Capture a transparent image | omitBackground: true |
PNG with transparent areas instead of Playwright’s default white |
| Print a colored PDF | printBackground: true and print-media handling |
PDF that includes background graphics when the page’s print CSS allows them |
Apply a color for one screenshot
The style option is the cleanest approach for a one-off image. It applies a stylesheet while the screenshot is made, so your application’s normal CSS is not permanently changed. The rule below targets both the document root and the body; !important helps it win against site styles that set a white background.
import { chromium } from 'playwright';
const browser = await chromium.launch();
const page = await browser.newPage({ viewport: { width: 1440, height: 900 } });
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.screenshot({
path: 'dark-background.png',
style: 'html, body { background: #1e293b !important; }'
});
await browser.close();Replace #1e293b with any valid CSS color, such as rgb(15 23 42), hsl(220 40% 10%), or a named color. The stylesheet can also set gradients, background images, or other capture-only adjustments. Playwright documents that screenshot styling can pierce Shadow DOM and apply to inner frames, which is useful when the visible background is rendered inside a component or embedded frame.
Make a full-page background cover the document
A viewport screenshot captures only what is visible. Add fullPage: true when the background must extend through the entire scrollable page.
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await page.screenshot({
path: 'full-page.png',
fullPage: true,
style: 'html, body { background: #0f172a !important; }'
});Full-page capture can trigger additional layout and lazy-loading work. Wait for important content before taking the image, and use a deterministic viewport and device scale factor in visual tests.
Color only one component
Use a locator screenshot when the page should remain unchanged and only a component needs a colored background.
await page.locator('.hero').screenshot({
path: 'hero.png',
style: '.hero { background: #1e293b !important; }'
});If the component has a transparent child over the page, style the element that actually paints the pixels. Inspect the DOM to determine whether that is the host, a wrapper, or a pseudo-element.
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addStyleTag inserts a stylesheet into the page before capture. This is useful when you need the same override for several screenshots, interactions, or assertions.
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import { chromium } from 'playwright';
const browser = await chromium.launch();
const page = await browser.newPage();
await page.goto('https://example.com', { waitUntil: 'domcontentloaded' });
await page.addStyleTag({
content: `
html, body {
background: #1e293b !important;
}
`
});
await page.screenshot({ path: 'persistent-override.png', fullPage: true });
await browser.close();Because this stylesheet remains active, later interactions and screenshots see the override. If you need to remove it, keep the returned style element handle and call its removal method, or navigate to a new document. A navigation replaces the document and therefore removes injected styles.
Handle pages that paint a nested surface
A white screenshot can come from a wrapper such as #app, a card, or a pseudo-element rather than body. Extend the rule to the elements that cover the viewport:
await page.screenshot({
path: 'surface.png',
style: `
html, body, #app, .page-shell {
background: #111827 !important;
}
`
});For a pseudo-element, override it explicitly, for example .page-shell::before { background: #111827 !important; }. Avoid broad rules that recolor text panels or controls unless that is intentional.
Solid colors versus transparent screenshots
Playwright’s omitBackground: true does not choose a color. It hides the default white background and allows transparency, as stated in the Playwright API documentation. Use a format that supports an alpha channel, normally PNG.
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await page.screenshot({
path: 'transparent.png',
omitBackground: true
});Do not combine an opaque CSS background with omitBackground: true when transparency is the goal: your CSS rule still paints an opaque surface. The option is not applicable to JPEG, whose format has no alpha channel. WebP can support transparency when encoded in a configuration that preserves alpha, but PNG is the least ambiguous choice for test fixtures and design assets.
Transparent element capture
await page.locator('.logo').screenshot({
path: 'logo-transparent.png',
omitBackground: true
});Only pixels that are actually transparent remain transparent. A child element with its own solid background will remain opaque.
Why a Playwright screenshot is still white
- The rule loses the cascade: add
!important, target the painted wrapper, or load the override after the site stylesheet. - The screenshot is transparent by design: check whether
omitBackgroundis enabled and inspect the image against a checkerboard viewer. - Only the viewport was captured: use
fullPage: truefor the complete document. - A component or iframe owns the background: target its host or inner content. The
stylescreenshot option can reach Shadow DOM and inner frames, while a normal page stylesheet may not cross those boundaries. - Images or fonts have not loaded: wait for a selector, a load state, or application-specific readiness signal before capture.
- Animation changes the color: disable transitions and animations in the temporary stylesheet for deterministic output.
await page.screenshot({
path: 'stable.png',
style: `
*, *::before, *::after {
animation: none !important;
transition: none !important;
}
html, body { background: #1e293b !important; }
`
});Background colors in PDFs
page.pdf() uses print CSS media by default. Background graphics are controlled by printBackground, so a color visible in a screen screenshot may disappear from the PDF.
await page.emulateMedia({ media: 'screen' });
await page.pdf({
path: 'colored.pdf',
printBackground: true
});Use emulateMedia({ media: 'screen' }) when you want screen styles rather than @media print rules. If print CSS intentionally changes the color, inspect those rules. For exact color reproduction, the documented -webkit-print-color-adjust property can force the browser to preserve author colors:
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await page.addStyleTag({
content: `
html, body {
background: #1e293b !important;
-webkit-print-color-adjust: exact !important;
print-color-adjust: exact !important;
}
`
});
await page.pdf({ path: 'exact-color.pdf', printBackground: true });PDF pagination is separate from screenshot sizing. Use PDF paper size, margins, orientation, and page ranges for document layout; do not expect fullPage screenshot options to affect PDF output.
Use the same styling in visual regression tests
Screenshot assertions support a stylesheet through stylePath. Keep the override in version control so the baseline and comparison receive identical CSS.
import { test, expect } from '@playwright/test';
test('dark background is stable', async ({ page }) => {
await page.goto('https://example.com');
await expect(page).toHaveScreenshot('dark-bg.png', {
stylePath: './screenshot-overrides.css'
});
});screenshot-overrides.css might contain:
html, body {
background: #1e293b !important;
}
*, *::before, *::after {
animation: none !important;
transition: none !important;
}Use omitBackground in the assertion only when the expected image is intentionally transparent. Keep browser version, viewport, fonts, and device scale consistent to avoid unrelated pixel differences.
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- Confirm the intended output: opaque color, transparent PNG, component crop, full page, or PDF.
- Identify which element paints the pixels by inspecting computed styles and overlays.
- Apply a capture-only
stylefirst; switch toaddStyleTagonly when persistence is needed. - Wait for the page’s meaningful ready state, not merely a fixed delay, when content loads asynchronously.
- For PDFs, select the correct media type and enable
printBackground. - Open the generated file in an image viewer that shows alpha correctly; white in a viewer does not prove the file is opaque.
- When tests are flaky, freeze animation, use stable data, and keep the override file identical across baseline and comparison runs.
Or skip the browser setup
ScreenshotNeo provides a website screenshot API and MCP server when you prefer an HTTP request over maintaining Playwright browser code. A single GET request returns PNG, JPEG, WebP, or PDF. The API can apply custom CSS, wait for selectors or network idle, capture full pages or one CSS-selected element, set viewport and device presets, emulate dark mode, and more.
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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.webpSee the ScreenshotNeo documentation for all parameters, including a background override and transparent output. Cookie and consent banners, newsletter popups, and chat widgets are removed before the shot. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing; response headers report the page verdict and whether the request was billed. Its MCP server exposes take_screenshot, get_page_info, and capture_pdf to Claude, Cursor, and other MCP clients. The Free plan includes 1,000 shots each month with no card; paid plans start at $5 for 3,000 shots. Create a free ScreenshotNeo account.
Equivalent requests from Python and Node.js
Python
import requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
timeout=90,
)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
const fs = await import('node:fs/promises');
await fs.writeFile('shot.webp', Buffer.from(await res.arrayBuffer()));Use a short-lived API key where possible, keep it out of browser-side code, and set a request timeout appropriate for the target site. For large batches, ScreenshotNeo supports up to 100 URLs per call, asynchronous jobs with signed webhooks, caching with a chosen TTL, and a usage API.
Frequently Asked Questions
Can I set a different background for each screenshot?
Yes. Pass a different CSS string to each screenshot’s style option, or inject and replace a stylesheet between captures.
Does omitBackground work with JPEG?
No. JPEG does not support an alpha channel; use PNG when transparent pixels are required.
Why does my page background work in a PNG but not a PDF?
PDF generation uses print media by default. Emulate screen media when appropriate and set printBackground: true; also check @media print rules.
Quick Recap
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