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Choose the timestamp type before writing code
| Goal | Implementation | What changes |
|---|---|---|
| Keep run history separate | Generate a JavaScript timestamp and place it in path |
Only the filename changes; pixels remain untouched |
| Show capture time to viewers | Capture a Buffer, then draw text with an image-processing step | The timestamp becomes part of the image |
| Store Playwright Test artifacts | Use testInfo.outputPath() and optionally testInfo.attach() |
Files are placed in the test’s managed output directory |
| Use CLI or MCP defaults | Use the tool’s documented filename behavior, or provide an explicit name | Defaults are tool-specific and do not change Page API behavior |
The Page API documents path as the destination and infers PNG, JPEG, or WebP from the extension. It does not promise an automatic timestamp. See the Playwright Page API.
Add a timestamp to a screenshot filename
Generate the timestamp immediately before capture and pass the resulting path to page.screenshot(). ISO 8601 is sortable, but colons are inconvenient in some filenames, so replace them with hyphens.
import { chromium } from 'playwright';
const browser = await chromium.launch();
const page = await browser.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle' });
const timestamp = new Date().toISOString().replaceAll(':', '-');
await page.screenshot({
path: `screenshots/page-${timestamp}.png`,
fullPage: true
});
await browser.close();Create the screenshots directory before running this script, or create it in Node.js with mkdir/mkdirSync. The extension controls the encoded format: use .png for lossless output, .jpeg for a smaller photographic file, or .webp when that format fits your workflow.
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Use a filesystem-safe local timestamp
If you want a shorter name without punctuation, build the components yourself. This example uses local time; use UTC when artifacts from different machines must sort consistently.
function filenameTimestamp(date = new Date()) {
const pad = (n) => String(n).padStart(2, '0');
return [
date.getFullYear(),
pad(date.getMonth() + 1),
pad(date.getDate()),
'-',
pad(date.getHours()),
pad(date.getMinutes()),
pad(date.getSeconds())
].join('');
}
const name = `page-${filenameTimestamp()}.png`;
await page.screenshot({ path: `screenshots/${name}` });Do not use a timestamp as a substitute for a stable visual-regression filename. A changing name makes every run look like a new artifact. For comparisons, keep a fixed path such as baseline/home.png and store run metadata separately.
Add milliseconds when captures can collide
Two captures in the same second can receive the same name. The ISO form includes milliseconds, while the compact helper above does not. You can append date.getMilliseconds(), a test worker identifier, or a unique run ID when parallel workers write to one directory.
Put timestamp text inside the image
A filename timestamp is not visible to someone viewing the screenshot. To place text in the pixels, capture without a path so Playwright returns a Buffer, then pass that Buffer through an image-processing library that supports text drawing. Playwright documents Buffer capture and post-processing in its screenshots guide; it does not prescribe one particular image library.
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import { chromium } from 'playwright';
import fs from 'node:fs/promises';
// Replace this import with the image library your project standardizes on.
import sharp from 'sharp';
const browser = await chromium.launch();
const page = await browser.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle' });
const timestamp = new Date().toISOString();
const screenshotBuffer = await page.screenshot({ fullPage: true });
// Add text with your chosen image-processing API, then write the result.
// The exact overlay call depends on that library's SVG/text support.
const overlay = Buffer.from(
``
);
const output = await sharp(screenshotBuffer)
.composite([{ input: overlay, top: 0, left: 0 }])
.png()
.toBuffer();
await fs.writeFile('screenshots/page-with-timestamp.png', output);
await browser.close();The overlay must fit the image dimensions. For responsive pages, obtain the viewport or image metadata and calculate the text position dynamically. Keep the original Buffer if you need an unmodified artifact for pixel comparisons. Also note that adding text changes the image and can make visual-regression tests fail even when the page itself is unchanged.
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Use a page overlay instead of post-processing
If the timestamp should represent page state and can be included in the DOM, inject a fixed element before capture. This is convenient for debugging, but it intentionally changes the page and should usually be disabled for baseline screenshots.
const timestamp = new Date().toISOString();
await page.evaluate((value) => {
const badge = document.createElement('div');
badge.textContent = value;
Object.assign(badge.style, {
position: 'fixed', top: '8px', right: '8px', zIndex: '2147483647',
padding: '6px 10px', background: 'rgba(0,0,0,.75)', color: 'white',
font: '14px monospace'
});
document.body.appendChild(badge);
}, timestamp);
await page.screenshot({ path: 'screenshots/debug.png', fullPage: true });For a full-page capture, a fixed element can appear according to browser rendering rules and may be repeated or positioned differently than an element in normal document flow. Post-processing gives more predictable control over the final pixels.
Timestamp Playwright Test artifacts
In Playwright Test, use the supplied testInfo object rather than hard-coding a project directory. testInfo.outputPath() returns a path inside the current test’s output directory, and testInfo.attach() can attach a Buffer or file to the report. The API is documented in TestInfo.
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import { test } from '@playwright/test';
test('timestamped artifact', async ({ page }, testInfo) => {
await page.goto('https://example.com');
const timestamp = new Date().toISOString().replaceAll(':', '-');
const file = testInfo.outputPath(`home-${timestamp}.png`);
await page.screenshot({ path: file, fullPage: true });
await testInfo.attach('home-screenshot', {
path: file,
contentType: 'image/png'
});
});If you do not need a separate file, attach the screenshot Buffer directly:
const buffer = await page.screenshot();
await testInfo.attach('home-screenshot', {
body: buffer,
contentType: 'image/png'
});Use a timestamped attachment name only when the report needs multiple captures of the same logical step. Otherwise, stable names make reports and automated consumers easier to query.
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Locator screenshots and the API surface you are using
For one element, prefer locator.screenshot(). It captures the matching element and avoids the discouraged ElementHandle pattern. Read the Locator API and the ElementHandle API notes when migrating older code.
const timestamp = new Date().toISOString().replaceAll(':', '-');
await page.locator('[data-testid="invoice"]').screenshot({
path: `screenshots/invoice-${timestamp}.png`
});The same filename rules apply: the timestamp is in the path, not in the element’s pixels.
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The Playwright CLI screenshot documentation and Playwright MCP screenshots documentation describe timestamped default filenames when their filename parameter is omitted. Those defaults belong to those tools. They are not evidence that page.screenshot() adds a timestamp. Supply an explicit filename whenever another process, CI job, or script depends on a predictable path. See Playwright Screenshots & PDF and Playwright MCP screenshots.
Common failures and fixes
The timestamp is not visible
Cause: it was added only to path. Fix: capture a Buffer and post-process it, or inject a temporary DOM badge.
Files are overwritten
Cause: the name has insufficient precision or parallel workers share one path. Fix: include milliseconds, a worker ID, or a unique run ID; create separate worker directories.
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Screenshot fails with a missing directory error
Cause: Playwright does not create every parent directory in your chosen path. Fix: create the directory before capture, or use testInfo.outputPath() in Playwright Test.
JPEG or WebP output is unexpected
Cause: the extension determines the inferred type. Fix: check the extension and set screenshot options appropriate to that format.
Visual tests fail after adding an overlay
Cause: the timestamp changes pixels on every run. Fix: keep timestamped debug captures separate from stable comparison screenshots, or mask the overlay in the comparison workflow.
Parallel runs produce confusing chronology
Cause: local clocks or mixed time zones. Fix: use UTC ISO timestamps and include the run or worker identifier in the filename.
The page is still loading when captured
Cause: navigation completion is not the same as visual readiness. Fix: wait for a selector, an application-ready condition, or an appropriate load state before generating the timestamp and taking the shot. This keeps the timestamp close to the actual capture event.
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Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. It accepts a URL in one request and can return PNG, JPEG, WebP, or PDF. Cookie and consent banners, newsletter popups, and chat widgets are removed before capture; bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing result. Its MCP server provides take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients.
To timestamp the downloaded file, put the current time in your local output filename:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o "stripe-$(date -u +%Y%m%dT%H%M%SZ).webp"See the ScreenshotNeo documentation for authentication and options. The same request in Python is:
import requests
from datetime import datetime, timezone
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()
name = datetime.now(timezone.utc).strftime("stripe-%Y%m%dT%H%M%SZ.webp")
open(name, "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?${q}`);
if (!res.ok) throw new Error(`${res.status} ${res.statusText}`);
const stamp = new Date().toISOString().replaceAll(':', '-');
const fs = await import('node:fs/promises');
await fs.writeFile(`stripe-${stamp}.webp`, Buffer.from(await res.arrayBuffer()));ScreenshotNeo includes full-page and selector captures, device and viewport controls, retina scale, custom CSS and JavaScript, waits, request blocking, headers, cookies, user agents, timezone and geolocation, caching with a chosen TTL, signed links, asynchronous jobs, webhooks, bulk capture for up to 100 URLs per call, usage APIs, and an OpenAPI specification. Every feature is on every plan: 1,000 shots per month are free with no card; paid plans start at $5 for 3,000 shots. Create a free ScreenshotNeo account.
Practical decision checklist
- Use a timestamped filename when you need unique artifacts without changing image content.
- Use a Buffer and post-processing when viewers must read the time in the image.
- Use a DOM badge only for temporary debugging or demonstrations.
- Use stable names for visual-regression baselines.
- Use UTC, sufficient precision, and worker or run identifiers for parallel CI.
- Provide explicit names with CLI and MCP when downstream automation needs predictable paths.
Frequently Asked Questions
Does Playwright automatically timestamp Page API screenshots?
No. The Page API saves to the path you provide. Generate the timestamp yourself and include it in that path.
Can a timestamp be added without changing screenshot pixels?
Yes. Put it only in the filename. Visible timestamp text necessarily changes the image.
What is the recommended API for an element screenshot?
Use locator.screenshot(); Playwright discourages the older ElementHandle screenshot pattern.
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