To find every discoverable image, combine five passes: parse each page for img and picture references, expand every srcset candidate, inspect lazy-load attributes and CSS url(...) values, render JavaScript when needed, and parse image sitemaps. Normalize each URL against its source page, remove fragments for deduplication, and retain provenance so you know where every result came from.
The coverage problem: “all images” has several meanings
A static HTML parser can find images present in the response returned by a server. It cannot see an image that JavaScript creates later, a CSS background hidden in a downloaded stylesheet, or an asset listed only in a sitemap. Treat image discovery as layered collection rather than a single selector.
| Pass | What it finds | Trade-off |
|---|---|---|
| HTML parsing | img[src], fallback images, srcset, and picture source candidates |
Fast and reproducible, but limited to the initial response |
| Lazy-load inspection | Site-specific attributes such as data-src and data-srcset |
Useful without a browser, but attribute names are not standardized |
| CSS inspection | Inline and stylesheet background-image:url(...) assets |
Requires downloading stylesheets and parsing CSS |
| Rendered browser | Images inserted or selected after JavaScript, including network requests | More time, memory, and operational complexity |
| Sitemap discovery | Image URLs absent from page HTML, including CDN-hosted assets | Completeness depends on the site’s publishing practice |
“All” should therefore mean all URLs your chosen passes can discover, not a guarantee that private, blocked, or unreferenced files will be revealed.
Start with a static Python extractor
Install the two dependencies:
python -m pip install requests beautifulsoup4The script below handles ordinary images, responsive candidates, common lazy-load attributes, inline CSS, linked stylesheets, URL normalization, and provenance. It prints one JSON record per unique URL.
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from collections import deque
from urllib.parse import urljoin, urldefrag, urlparse
import json
import re
import requests
from bs4 import BeautifulSoup
URL = 'https://example.com/'
TIMEOUT = 20
CSS_URL = re.compile(r'url\(\s*["\']?([^"\')]+)', re.I)
session = requests.Session()
session.headers['User-Agent'] = 'image-discovery/1.0 (contact: [email protected])'
def normalize(raw, base):
raw = raw.strip()
if not raw or raw.startswith(('data:', 'blob:', 'javascript:')):
return None
absolute = urljoin(base, raw)
absolute, _fragment = urldefrag(absolute)
parsed = urlparse(absolute)
if parsed.scheme not in ('http', 'https'):
return None
return absolute
def add(record, raw, base, attribute):
value = normalize(raw, base)
if value:
record.setdefault(value, set()).add(attribute)
def srcset_values(value):
# Handles normal URL + descriptor pairs such as 320w and 2x.
for candidate in value.split(','):
parts = candidate.strip().split()
if parts:
yield parts[0]
def css_values(text):
for match in CSS_URL.finditer(text):
yield match.group(1).strip()
def extract_page(page_url):
response = session.get(page_url, timeout=TIMEOUT)
response.raise_for_status()
soup = BeautifulSoup(response.text, 'html.parser')
found = {}
for tag in soup.select('img, source'):
for name in ('src', 'data-src', 'data-original', 'data-lazy-src'):
if tag.get(name):
add(found, tag[name], page_url, name)
if tag.get('srcset'):
for candidate in srcset_values(tag['srcset']):
add(found, candidate, page_url, 'srcset')
if tag.get('data-srcset'):
for candidate in srcset_values(tag['data-srcset']):
add(found, candidate, page_url, 'data-srcset')
for tag in soup.select('[style]'):
for raw in css_values(tag.get('style', '')):
add(found, raw, page_url, 'inline-css')
for link in soup.select('link[rel="stylesheet"][href]'):
css_url = normalize(link['href'], page_url)
if not css_url:
continue
css = session.get(css_url, timeout=TIMEOUT)
css.raise_for_status()
for raw in css_values(css.text):
add(found, raw, css_url, 'stylesheet-css')
return [{'url': image, 'source_page': page_url,
'attributes': sorted(attributes)}
for image, attributes in sorted(found.items())]
if __name__ == '__main__':
print(json.dumps(extract_page(URL), indent=2))The img fallback matters even inside a picture element; responsive markup can contain several valid candidates. Preserve query strings because they may select a size, format, or transformation. Removing only the fragment prevents the same resource from being counted repeatedly when links differ only by #anchor.
Turn the extractor into a small crawl
For multiple pages, maintain a queue of same-site links, a visited set, and a request limit. Add links selected with a[href], normalize them, and enqueue only the hostnames you explicitly allow. Store each record’s source page and attribute instead of returning only a bare URL. That audit trail lets you distinguish an HTML reference from a CSS or sitemap discovery.
Responsive images: collect every candidate
Do not stop at img[src]. A srcset may list several widths (320w, 768w) or pixel-density variants (1x, 2x). Under picture, each source[srcset] can represent a different format or media condition, while the nested img[src] remains the fallback. Collect all candidates; selecting the one a browser would display requires evaluating media conditions and device characteristics.
The simple comma split in the example works for conventional URL-and-descriptor lists. If a site uses unusual values, use a standards-aware srcset parser and keep the original descriptor with each record so downstream code can choose an appropriate rendition.
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Find images hidden by lazy loading
Many sites put the real URL in attributes such as data-src, data-srcset, data-original, or data-lazy-src and leave a placeholder in src. These names are site-specific, so inspect the markup and add selectors for the site you are analyzing. Also look for JSON state embedded in script tags; a framework may keep image URLs there before inserting them into the DOM.
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If the initial response contains no useful URL, render the page. A headless browser can scroll to trigger viewport-based lazy loading, wait for network activity to settle, and then inspect the post-render DOM. Capture network requests as well: an image requested by JavaScript may never appear as a normal HTML attribute.
Rendered pass with Playwright
Install Playwright and its browser once:
python -m pip install playwright
python -m playwright install chromiumThis example records image responses and final DOM attributes. It intentionally limits scrolling and waiting so you can set resource bounds for a larger crawl.
from urllib.parse import urldefrag
from playwright.sync_api import sync_playwright
page_url = 'https://example.com/'
seen = set()
with sync_playwright() as p:
browser = p.chromium.launch(headless=True)
page = browser.new_page()
page.on('response', lambda response: seen.add(urldefrag(response.url)[0])
if response.request.resource_type == 'image' else None)
page.goto(page_url, wait_until='networkidle', timeout=60000)
for _ in range(4):
page.evaluate('window.scrollBy(0, window.innerHeight)')
page.wait_for_timeout(500)
for value in page.locator('img, source').evaluate_all(
"els => els.flatMap(e => [e.src, e.srcset, e.dataset.src, e.dataset.srcset])"):
if value:
for item in value.split(','):
seen.add(urldefrag(item.strip().split()[0])[0])
browser.close()
for image in sorted(seen):
print(image)Use rendering only where static parsing is insufficient. Browser sessions consume substantially more CPU, memory, and bandwidth than HTTP requests, and JavaScript can trigger third-party requests you did not intend to crawl.
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Decorative images commonly live in background-image declarations rather than image elements. Scan every inline style and downloaded stylesheet for url(...). Resolve stylesheet-relative paths against the stylesheet URL, not the HTML page URL. Ignore data: URLs unless your goal is to inventory embedded bytes; they are not separately fetchable image URLs.
A regular expression is adequate for ordinary CSS, but production crawlers should use a CSS parser to handle escaped characters, comments, nested rules, and quoted parentheses correctly. Keep the stylesheet URL as provenance.
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Use sitemaps to discover what pages omit
Check /sitemap.xml, sitemap indexes, and any sitemap URL declared in robots.txt. Image sitemaps can contain an image:image element with an image:loc URL, including an image hosted on a separate CDN domain. Parse every child sitemap recursively, enforce a maximum count, and deduplicate against page-derived results.
A sitemap is a discovery source, not proof of completeness. Sites may omit old assets, publish stale entries, or list only selected images. Record the sitemap URL and XML location for each result so later verification is possible.
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Fetch and honor the applicable robots.txt rules before crawling. Robots.txt is a crawler directive, not an access-control boundary: a disallowed URL may still be indexed when linked elsewhere, and a permitted URL is not automatically authorized for every use. Follow the site’s terms, identify your client, rate-limit requests, and stop on repeated failures.
For a large crawl, use conditional requests (ETag and Last-Modified), connection pooling, exponential backoff for transient 5xx responses, and a bounded queue. Cache downloaded HTML and CSS, but do not silently reuse a response after its freshness assumptions expire.
Choose an approach by coverage and cost
- Need a quick inventory of a few pages: static HTML plus inline and linked CSS.
- Need responsive variants: collect every
srcsetand preserve descriptors. - Need lazy or JavaScript-created assets: render with a headless browser and observe image network requests.
- Need site-wide discovery: combine a controlled crawl with sitemap indexes and image extensions.
- Need reproducibility: save the page URL, attribute, timestamp, HTTP status, and normalized URL for every record.
Separate discovery from downloading. First produce a deduplicated manifest; then apply your own allowlist, file-type checks, size limits, and licensing review before fetching binaries. An image URL is not automatically permission to copy or republish the image.
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- High Compatibility & Multi Application - C960 webcam for laptop is compatible with Windows 10/11, macOS 10.14+, and Android TV 7.0+. Not supported: Windows Hello, TVs, tablets, or game consoles. It works with Zoom, Teams, Facetime, Google Meet, YouTube and more. Please select C960 webcam as the default camera and microphone device in your application and ensure camera/microphone permissions are enabled, especially on macOS. (Tips: Incompatible with Windows Hello)
Common failures and fixes
Only a few images are returned
Cause: the page uses picture, srcset, or lazy attributes that your selector ignores. Fix: collect source[srcset], all responsive candidates, and the site’s observed data-* attributes.
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CSS images are missing
Cause: you scanned HTML but not linked stylesheets, or resolved paths against the wrong base. Fix: download each stylesheet, parse url(...), and resolve relative to that stylesheet’s URL.
The HTML has no image URLs
Cause: JavaScript obtains data after load or an API response supplies the gallery. Fix: render, inspect network requests, and identify the underlying JSON endpoint; apply the endpoint’s access and rate limits.
Relative URLs become invalid
Cause: string concatenation ignores the document or stylesheet base. Fix: use urljoin, then remove only fragments with urldefrag.
Requests fail or return a challenge page
Cause: rate limits, authentication, geo restrictions, or bot checks. Fix: slow down, supply authorization only when you have permission, honor robots and terms, and do not attempt to bypass a CAPTCHA or access control.
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Duplicate URLs remain
Cause: the same asset appears in HTML, CSS, and a sitemap, or differs only by a fragment. Fix: deduplicate normalized URLs while retaining every source record and attribute.
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Use the documented endpoint and parameters shown in the ScreenshotNeo documentation:
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import requests
r = requests.get('https://api.screenshotneo.com/v1/shot', params={'access_key': 'YOUR_API_KEY', 'url': 'https://example.com'}, timeout=90)
r.raise_for_status()
open('shot.webp', 'wb').write(r.content)For Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://example.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`${res.status} ${res.statusText}`);
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Frequently Asked Questions
Should I save the original HTML and CSS?
Yes. Store the response bodies or content hashes alongside your manifest when reproducibility matters; pages and stylesheets can change while you are processing the results.
How do I tell whether two different URLs serve the same file?
Fetch permitted assets and compare bytes or a cryptographic hash after redirects. URL normalization alone cannot prove that two CDN variants are identical.
Can an image sitemap replace crawling?
No. It can reveal assets omitted from page markup, but its coverage depends on how consistently the site maintains its sitemap.
Quick Recap
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