The Tool Desk
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Why headed and headless screenshots differ
Headed mode displays a browser window; headless mode renders without one. The test code can be identical while the rendering context is not. Playwright documents differences caused by the host operating system, browser version, browser settings, hardware, power source, headless mode and other environmental factors. Fonts and platform text-rendering are especially visible in visual comparisons.
Snapshot names also encode the browser and platform because the same page can render differently across engines and operating systems. A test that passes with a local headed baseline can therefore fail in CI headless even when the application has not changed.
There is no authoritative universal percentage for how often these differences occur, how many pixels should change, or which comparison threshold is always safe. Treat the mismatch as a reproducibility problem rather than assuming the headless image is wrong.
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Fix sequence: make every rendering input explicit
1. Pin the execution environment
Generate baselines and compare them in the same container image or operating-system image. Pin the Playwright package and the browser build it installs. Install the same font files in local and CI environments; a fallback font changes glyph widths, line wrapping and element heights.
- Use one OS or container image for baseline generation and verification.
- Lock the Playwright version and browser revision in your dependency and CI configuration.
- Install identical fonts, including web-font prerequisites and any fonts used by your product.
- Keep locale, timezone and other process-level settings stable.
If you must compare two environments, record their image digest, browser version, Playwright version and installed fonts alongside each artifact. That turns an unexplained diff into a reproducible comparison.
2. Set viewport and device scale factor
Define the browser context rather than relying on machine defaults. Playwright’s emulation controls include viewport, screen size, user agent, touch behavior and device scale factor. A different viewport can trigger a breakpoint; a different device scale factor changes rasterization and image dimensions.
import { chromium } from '@playwright/test';
const browser = await chromium.launch({ headless: true });
const context = await browser.newContext({
viewport: { width: 1440, height: 900 },
deviceScaleFactor: 1,
locale: 'en-US',
timezoneId: 'UTC',
});
const page = await context.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.screenshot({ path: 'headless.png', fullPage: true, scale: 'css' });
await browser.close();Use the same values in headed and headless launches. The exact numbers are a project decision; consistency matters more than choosing a particular desktop size.
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3. Keep screenshot scale identical
Playwright’s scale option controls output density. scale: "css" emits one image pixel per CSS pixel. scale: "device" emits one pixel per device pixel and can produce larger high-DPI images. Select one value and use it in both modes, otherwise a comparison can fail even when the layout is the same.
4. Freeze animation and transition state
Visual assertions disable animations by default: finite animations are fast-forwarded and infinite animations are canceled for capture. Preserve that behavior explicitly, or inject a screenshot-only stylesheet that disables transitions and animations. Also wait for the application state you intend to compare; a screenshot taken during hydration is not equivalent to one taken after data loads.
import { test, expect } from '@playwright/test';
test('stable visual', async ({ page }) => {
await page.goto('/');
await expect(page).toHaveScreenshot('home.png', {
animations: 'disabled',
caret: 'hide',
scale: 'css',
fullPage: true,
});
});5. Remove transient UI instead of masking real defects
Use caret: 'hide' to prevent a blinking text cursor. Mask dynamic locators and use style or stylePath for clocks, rotating promotions, advertisements and third-party widgets. Prefer masking or deterministic fixtures to increasing the comparator threshold: a relaxed threshold can hide a genuine layout regression.
await expect(page).toHaveScreenshot('dashboard.png', {
animations: 'disabled',
caret: 'hide',
scale: 'css',
style: `
*, *::before, *::after {
animation: none !important;
transition: none !important;
}
.live-clock, .rotating-ad, .chat-widget {
visibility: hidden !important;
}
`,
mask: [page.locator('[data-testid="current-time"]')],
});6. Capture the same scope and options
Decide whether the contract is a viewport shot, an element shot, or a full-page image. Use the same fullPage, clip, locator, and screenshot options in both runs. Full-page capture can expose lazy-loaded content that a viewport capture never reaches, so it must be part of the test definition rather than an ad-hoc debugging change.
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A deterministic Playwright project
Put shared rendering inputs in the project configuration so every developer and CI job inherits them. Keep headed and headless projects identical except for the headless launch setting when you are deliberately diagnosing that difference.
import { defineConfig, devices } from '@playwright/test';
export default defineConfig({
use: {
...devices['Desktop Chrome'],
viewport: { width: 1440, height: 900 },
deviceScaleFactor: 1,
locale: 'en-US',
timezoneId: 'UTC',
colorScheme: 'light',
screenshot: 'only-on-failure',
},
projects: [
{
name: 'chromium-stable',
use: { ...devices['Desktop Chrome'] },
},
],
});Generate a baseline and run comparisons with this same project and environment. The configuration controls are stable, but the correct viewport, locale and browser project depend on the product you are testing.
Compare environments in a fixed order
| Check | What to make identical | Typical symptom when it differs |
|---|---|---|
| OS or container | Same image, libraries and rendering stack | Text anti-aliasing, line breaks or subtle color changes |
| Browser and Playwright | Same engine, browser build and package version | Layout, CSS or screenshot behavior changes |
| Fonts | Same installed font files and loading state | Different glyph widths, wrapping and element heights |
| Viewport | Identical width and height | Responsive breakpoint or reflow differences |
| Device and screenshot scale | Same deviceScaleFactor and scale |
Different image dimensions or rasterization |
| Locale and timezone | Same browser context and process settings | Dates, numbers, text direction or localized content changes |
| Timing and data | Same animation, network and fixture state | Loading spinners, rotating content or changed values |
| Capture scope | Same viewport, element, clip or full-page setting | Missing, extra or differently sized regions |
| Comparator | Threshold only after deterministic causes are fixed | False failures from unavoidable raster differences |
Troubleshooting common failures
“It passes headed locally but fails headless in CI”
Start by running the local test in the same CI container and browser revision. Verify fonts and viewport before changing application code. If the image then matches, the original failure was environmental.
Text wraps on one run
Compare installed fonts, font-loading completion, viewport width and device scale factor. Wait for the relevant web font or use a deterministic font setup. A fallback font can alter wrapping without any CSS change.
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The image is a different size
Check deviceScaleFactor, scale, viewport dimensions and whether one capture uses fullPage. A device-pixel screenshot is expected to be larger than a CSS-pixel screenshot on a high-DPI context.
Only animated or live regions differ
Disable animations, hide the caret, mask dynamic locators and freeze API data. For third-party widgets, inject a screenshot stylesheet or block the widget in the test environment. Do not mask the entire page; keep the assertion sensitive to meaningful changes.
Differences remain after all settings match
Confirm that both runs use the same browser binary and OS libraries, then inspect locale, timezone, color scheme, reduced-motion preferences and network responses. Compare a small element first, then expand to full-page capture. Adjust a comparator threshold only when the remaining variation is understood and acceptable.
Reliability and performance practices
- Use a reusable, pinned CI image so browser startup and font installation are not variable.
- Wait for a meaningful readiness signal (such as a page-specific selector or settled data), not an arbitrary long sleep.
- Prefer deterministic fixtures and mocked clocks for pages that display time or random values.
- Keep screenshot options in a shared helper or test configuration to prevent headed and headless drift.
- Store the environment metadata with failed artifacts so a later rerun can reproduce the exact context.
- Use element screenshots while debugging to isolate the first divergent component, then restore the agreed capture scope.
Or skip the browser setup
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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.webpimport 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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FAQ
Should headed mode be the baseline?
No. The baseline should be generated in the same environment and mode used for comparison. Choose the mode that matches production or CI, then keep it stable.
Can I solve every mismatch by increasing the threshold?
No. A threshold is appropriate only for understood, unavoidable raster variation. It should not conceal changed fonts, layout, content or timing.
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Yes, when you intentionally support multiple engines or platforms. Rendering and fonts can differ, so keep browser- and platform-specific projects and baselines.
Frequently Asked Questions
Should headed mode be the baseline?
No. Generate and compare baselines in the same environment and mode used by the test target.
Can I solve every mismatch by increasing the threshold?
No. Increase it only for understood, unavoidable raster variation after deterministic causes are fixed.
Do I need separate snapshots for each browser?
Yes, when supporting multiple engines or platforms, because rendering and fonts can differ.
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