Use Selenium to discover the image URL, then use an HTTP client such as requests to download the original bytes. This two-step approach handles JavaScript-rendered pages without confusing an image file with a screenshot of the browser. Load the page, wait for the intended <img>, read its browser-resolved URL, request that URL, validate the response, and write it in binary mode.
What Selenium does—and what it does not do
Selenium is a browser-automation library. It can open a page, execute its JavaScript, accept a consent dialog, scroll lazy content into view, and locate elements. It is not required to write the original image response to disk. Separating discovery from transfer usually produces simpler and more reliable code.
An image element’s src or currentSrc points to the asset requested by the browser. An HTTP client can then retrieve that URL directly. By contrast, Selenium’s save_screenshot() method saves pixels from the current browser window; it does not return the source file represented by an image element.
Prerequisites and installation
- Python 3.10 or newer, in an isolated virtual environment.
- A supported browser such as Chrome, Edge, or Firefox.
- The Selenium Python package and the
requestsHTTP client.
python -m venv .venv
# macOS/Linux
source .venv/bin/activate
# Windows PowerShell
.venvScriptsActivate.ps1
python -m pip install -U selenium requestsRecent Selenium releases include Selenium Manager, which can locate or manage a compatible browser driver. Browser and driver support changes, so check the Selenium and browser versions used by your project. Always call driver.quit() in cleanup.
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Complete example: find and download a rendered image
The following implementation waits for a specific image, scrolls it into view (useful for lazy loading), chooses currentSrc when available, downloads the response, checks its status and media type, and selects a matching extension. Replace the URL and CSS selector with values from the site you control or are authorized to access.
from pathlib import Path
from urllib.parse import urlparse
import requests
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.ui import WebDriverWait
PAGE_URL = "https://example.com/gallery"
IMAGE_SELECTOR = "main img.hero" # use a stable selector
OUTPUT_BASENAME = "downloaded-image"
# A conservative mapping; add formats your application accepts.
EXTENSIONS = {
"image/jpeg": ".jpg",
"image/png": ".png",
"image/webp": ".webp",
"image/gif": ".gif",
"image/avif": ".avif",
"image/svg+xml": ".svg",
}
def extension_for(content_type: str, image_url: str) -> str:
media_type = content_type.split(";", 1)[0].strip().lower()
if media_type in EXTENSIONS:
return EXTENSIONS[media_type]
# A URL suffix is only a fallback; query strings are ignored.
suffix = Path(urlparse(image_url).path).suffix.lower()
return suffix if suffix in {".jpg", ".jpeg", ".png", ".webp", ".gif", ".avif", ".svg"} else ".bin"
def main() -> None:
options = webdriver.ChromeOptions()
# options.add_argument("--headless=new") # enable when a visible browser is unnecessary
driver = webdriver.Chrome(options=options)
try:
driver.get(PAGE_URL)
wait = WebDriverWait(driver, 30)
image = wait.until(EC.presence_of_element_located((By.CSS_SELECTOR, IMAGE_SELECTOR)))
# Trigger site-specific lazy-loading behavior when needed.
driver.execute_script("arguments[0].scrollIntoView({block: 'center'});", image)
wait.until(lambda d: d.execute_script(
"return arguments[0].complete && arguments[0].naturalWidth > 0;", image
))
image_url = image.get_attribute("currentSrc") or image.get_attribute("src")
if not image_url or image_url.startswith("data:"):
raise RuntimeError("The element has no downloadable HTTP(S) image URL")
response = requests.get(
image_url,
timeout=(10, 60),
headers={"User-Agent": driver.execute_script("return navigator.userAgent;")},
)
response.raise_for_status()
content_type = response.headers.get("Content-Type", "")
if not content_type.lower().split(";", 1)[0].startswith("image/"):
raise RuntimeError(f"Expected an image response, received {content_type or 'no Content-Type'}")
output = Path(OUTPUT_BASENAME + extension_for(content_type, image_url))
output.write_bytes(response.content)
print(f"Saved {len(response.content)} bytes to {output} from {image_url}")
finally:
driver.quit()
if __name__ == "__main__":
main()presence_of_element_located only proves that the element exists. The additional complete/naturalWidth condition waits for a successfully decoded image. Some applications replace the element or set its URL only after another event; in that case, wait for a page-specific attribute or state instead.
How to get the correct image URL with Selenium
src versus currentSrc
src is the attribute authored in the DOM and may be a placeholder. currentSrc is the URL the browser selected after evaluating srcset and sizes, so it is normally the right choice when you want the variant actually displayed. Use src as a fallback for simple markup.
url = image.get_attribute("currentSrc") or image.get_attribute("src")
print(url)Lazy-loaded images
Pages commonly store a real URL in attributes such as data-src until the image approaches the viewport. Scroll the element into view, then wait for naturalWidth > 0. If the site uses an intersection observer or a carousel, click or advance that component as a real visitor would before reading the URL.
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WebDriver generally exposes a resolved URL for the src property. If you read a custom data attribute containing a relative path, resolve it against the page URL with Python’s urllib.parse.urljoin before calling requests.get.
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Data URLs and blobs
A data: URL embeds the image in the page; it is not an ordinary HTTP resource. A blob: URL belongs to the browser context and usually cannot be fetched by an unrelated HTTP session. For those cases, locate the site’s underlying network/API URL, use the browser’s download control, or extract the rendered pixels deliberately rather than pretending the value is a public file URL.
Keeping browser authentication when downloading
A direct requests call has no Selenium cookies by default. A public image works with the basic example, but a logged-in or signed image may return a login page, a 403 response, or an expired placeholder.
Use Selenium’s browser-synchronized request context
Current Selenium Python APIs document driver.request as an HTTP request context that synchronizes browser cookies. Check the API for the Selenium version you deploy, then use the context for the image request:
with driver.request as client:
response = client.get(image_url, timeout=60)
response.raise_for_status()
content_type = response.headers.get("Content-Type", "")
if not content_type.lower().split(";", 1)[0].startswith("image/"):
raise RuntimeError(f"Unexpected media type: {content_type}")
Path("authenticated-image" + extension_for(content_type, image_url)).write_bytes(response.content)Because API details can vary by Selenium release, pin and verify the version in your application. If that context is unavailable, copy the cookies deliberately into a requests.Session:
session = requests.Session()
for cookie in driver.get_cookies():
session.cookies.set(cookie["name"], cookie["value"], domain=cookie.get("domain"), path=cookie.get("path", "/"))
response = session.get(image_url, headers={"User-Agent": driver.execute_script("return navigator.userAgent;")}, timeout=60)
response.raise_for_status()Some sites also require a Referer, authorization header, or a short-lived signed URL. Reproduce only the headers and credentials you are permitted to use, and never log secrets.
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Choosing among download approaches
| Approach | Use it when | Trade-off |
|---|---|---|
Selenium discovery plus requests |
The browser reveals a URL that accepts a normal HTTP request | Clean separation and efficient transfer, but cookies and headers must be supplied separately |
| Selenium browser-synchronized request | The image requires the current browser session | Preserves browser cookies through Selenium’s current request API; verify version support |
| Browser-managed download | The site exposes a download or attachment workflow | Download directories, prompts, and completion detection differ by browser; configuration is browser-specific |
| Screenshot | You need the rendered viewport or pixels, not the source asset | Produces a screenshot and loses the original file’s encoding and metadata |
Validate the file before trusting it
- Call
raise_for_status()so a 404, 403, or server error cannot be silently saved as an image. - Inspect
Content-Type; an HTML login page often arrives with a successful HTTP status but is not an image. - Write
response.contentwithPath.write_bytesoropen(..., "wb"). Text mode can corrupt binary data. - Derive the extension from the media type where possible. A query string or a path ending in
.jpgdoes not guarantee JPEG bytes. - For untrusted files, add an image decoder or magic-byte check before further processing, and impose a maximum response size.
Troubleshooting common failures
The selector times out
Check the selector in the browser’s developer tools, account for an iframe, and wait for the page-specific state that creates the image. If the element is inside an iframe, switch first with driver.switch_to.frame(...); switch back with driver.switch_to.default_content() when finished.
The page loaded but the image is absent
Navigation reaching the page-load event does not mean AJAX or other JavaScript work has finished. Replace fixed sleeps with an explicit wait for the target element, a non-placeholder attribute, or a known application condition.
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Read both currentSrc and src, scroll the element into view, and check whether the page uses a thumbnail link surrounding the image. If you need the original, follow the gallery’s full-size URL rather than downloading the displayed thumbnail.
The response is HTML, 403, or a login page
Confirm the URL in a normal browser tab, then use the synchronized request context or transfer the relevant cookies. A missing Referer, authorization header, expired signed URL, rate limit, or bot challenge can also block a direct request. Do not bypass an access control that you are not authorized to bypass.
The saved file will not open
Print the status and content type, inspect the first bytes, and ensure binary mode was used. A file named .jpg can still contain an HTML error document or WebP data.
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Selenium saved a screenshot
driver.save_screenshot("image.png") captures the current browser window. To obtain the original asset, extract the image URL and download its response as shown above. Use a screenshot only when rendered pixels are the intended output.
A download prompt appears
That indicates you chose the browser-managed workflow. Configure the selected browser’s download directory and completion behavior for that browser and version; examples for one browser should not be treated as universal settings.
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- Reuse one driver for multiple pages when practical, but quit it when the job ends or fails.
- Use explicit connection and read timeouts. A 10-second connect and 60-second read timeout is a starting point, not a guarantee for every site.
- Prefer the smallest necessary browser window and headless mode for unattended jobs, while debugging visibly first.
- Do not add aggressive retry loops. Respect robots directives, terms, authentication boundaries, and server rate limits; use bounded retries only for transient failures.
- Cache URLs or downloaded bytes when the source permits it, and avoid downloading the same large asset repeatedly.
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FAQ
Can I download an image without opening a visible browser?
Yes. Add the appropriate headless option after you have confirmed the selector and waits in a visible session. Headless mode still performs browser rendering; it only changes how the window is displayed.
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Should I use the image’s alt text as the filename?
It can be a useful human label, but sanitize it, limit its length, and append the extension determined from the response. Never place unsanitized page text directly into a path.
Why does the browser show an image but my script receives a different variant?
Responsive markup can select a resource based on viewport width, device pixel ratio, and network conditions. currentSrc reports the variant selected in that Selenium session; a separate HTTP request may still need matching cookies or headers.
Frequently Asked Questions
Is Selenium itself an image downloader?
Selenium automates the browser and helps you discover the rendered image URL. A request client or a browser download workflow retrieves the bytes.
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What is the safest wait for a dynamically loaded image?
Wait for the target element and then verify that it is complete with a positive natural width, or wait for a site-specific loaded state.
When should I save a screenshot instead?
Use a screenshot when the required artifact is the rendered page or viewport. Download the source URL when you need the original image file.
Quick Recap
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