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For a test that needs to verify a downloaded file’s contents, use Selenium to reach the page and identify the download URL, then retrieve the file with a Python HTTP client. If the browser download interaction itself is what you need to test, configure a browser-specific download folder and check for completion separately: Selenium WebDriver does not expose download progress. For Remote WebDriver, the file starts on the remote machine; Selenium Grid’s managed-download support can transfer it to your client.
Choose the right download method
| Method | Best for | Where the file goes | Main limitation |
|---|---|---|---|
| HTTP client after Selenium navigation | Checking that a file was retrieved or validating its contents | A path chosen by the Python test | Authentication, cookies, redirects, and streaming behavior depend on the application. |
| Browser download to a configured folder | Testing the browser download interaction itself | The machine running the browser | WebDriver does not report download progress. |
| Grid managed download | Retrieving a file from a remote browser session | Downloaded to the client through Selenium’s managed-download support | Requires server and session configuration; file listings are snapshots and downloads follow the session lifecycle. |
Selenium’s guidance recommends using the browser to find the download link and obtain any required cookies, then using an HTTP library to fetch the file when the test is about the file itself. Selenium’s file-download guidance explains the limitation: a WebDriver click can start a download, but WebDriver does not expose its progress.
Download a file with Python after finding its link in Selenium
This is usually the clearest approach when your test must inspect the downloaded bytes. Selenium handles page navigation and any interaction needed to reveal the link. Python’s HTTP client then saves the response to a path you control.
- Navigate to the relevant page with Selenium and perform any steps needed to reveal the download link.
- Read the link’s final URL and identify the authentication state required by the application.
- Request the URL with an HTTP client, passing only the cookies or headers the application requires.
- Check the HTTP response and validate the saved file against your test’s requirements, such as expected format, size, or contents.
The following is a starting point for a publicly accessible file URL. It does not transfer Selenium cookies or handle every authentication, redirect, or streaming scheme. Add the application-specific session details when required.
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from pathlib import Path
import requests
from selenium import webdriver
from selenium.webdriver.common.by import By
output = Path("downloads")
output.mkdir(parents=True, exist_ok=True)
# Open the page and locate the link after any required UI interaction.
driver = webdriver.Chrome()
try:
driver.get("https://example.com/reports")
download_url = driver.find_element(By.CSS_SELECTOR, "a.download").get_attribute("href")
finally:
driver.quit()
if not download_url:
raise RuntimeError("Download link has no href")
response = requests.get(download_url, timeout=60)
response.raise_for_status()
file_path = output / "report.csv"
file_path.write_bytes(response.content)
if not file_path.exists() or file_path.stat().st_size == 0:
raise RuntimeError("Downloaded file is missing or empty")For a site that requires the browser session, transfer the necessary authentication data from Selenium to the HTTP client rather than assuming the URL alone is sufficient. Cookie formats, domain/path scope, redirects, and authorization headers vary by site. A single generic cookie-transfer snippet cannot safely cover every application.
Trigger a browser download to a local folder
Use this method when the click or browser behavior is part of the scenario. Set the download folder before creating the driver, click the link, then wait for an application-specific completion signal or check the filesystem for the expected completed file. The click only starts the download; it does not prove that writing has finished.
Rank #2
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There is no universal Selenium Python preference dictionary for Chrome, Edge, and Firefox. Their download settings are browser-specific, and the exact behavior should be checked against the browser version used by the project. Selenium’s current Python API documents Chrome’s enable_downloads property and Firefox’s preferences, set_preference, and enable_downloads options: ChromeOptions API and Firefox Options API.
from pathlib import Path
from selenium import webdriver
folder = Path("downloads").resolve()
folder.mkdir(parents=True, exist_ok=True)
# Configure the selected browser's own download-directory option/preferences here.
# Then create the driver with those options and navigate/click as needed.Use a completion condition that fits the application. Prefer an application-provided signal where available; otherwise poll for the expected file and account for temporary partial-download files used by the browser. Avoid treating a fixed sleep or the existence of a filename alone as proof that a large or streamed file is complete.
Rank #3
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Retrieve downloads from Selenium Grid
With Remote WebDriver, the browser’s ordinary download directory is on the remote machine, not the Python client. Grid managed downloads provide a way to retrieve supported downloads through the session. Selenium documents support for Chrome, Firefox, and Edge; confirm that the active Grid and Python binding versions support the configuration you use. See Remote WebDriver and Grid CLI options.
- Start the Grid node or standalone server with managed downloads enabled, for example
--enable-managed-downloads true. - Request managed downloads for the session using the
se:downloadsEnabledcapability. Current Python browser options expose anenable_downloadsproperty; check its serialization and the documented capability for your Grid version. - Trigger the download in the browser and wait for an application completion signal or otherwise establish that it is ready.
- List available files and retrieve the desired filename to a directory on the client.
The Python Remote WebDriver API documents get_downloadable_files(), download_file(file_name, target_directory), and delete_downloadable_files(). For example, after confirming that the download is complete:
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from pathlib import Path
folder = Path("downloads").resolve()
folder.mkdir(parents=True, exist_ok=True)
files = driver.get_downloadable_files()
if "report.csv" not in files:
raise RuntimeError(f"report.csv is not ready; available files: {files}")
driver.download_file("report.csv", str(folder))The file list is an immediate snapshot, not a wait-for-completion operation. Poll it or use an application completion signal before assuming a file is ready. Managed files are session-scoped and are cleaned up when the session ends or times out. The Python methods are documented in the Remote WebDriver API reference.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Version and browser compatibility
Selenium’s downloads page listed Python binding version 4.49.0, released September 9, 2026, at the time reflected by that page: Selenium downloads and releases. Selenium’s browser guidance states Selenium 4 is compatible with Chrome 75 and later, with matching Chrome and ChromeDriver major versions, and requires Firefox 78 or later while recommending the latest geckodriver. These are compatibility statements, not a guarantee for every hosted browser combination; verify the versions in your environment: Chrome guidance and Firefox guidance.
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Troubleshoot common failures
- The click succeeds but the file is missing or partial: A successful click only starts the browser action. Add an application completion signal or a file-based wait; for content validation, prefer an HTTP request and validate the response.
- The file is saved somewhere unexpected: For a local session, the browser writes on the local browser machine. For Remote WebDriver, it writes on the remote machine unless you use managed downloads or an appropriate shared storage location.
- The HTTP request returns an error or an HTML login page: The download endpoint may require cookies, authorization, a redirect flow, or other session state. Inspect the response status and content type, then pass the application-required authentication state.
- The Grid file list is empty: Check that managed downloads are enabled on the server and requested by the session. Also verify that the download has finished; the file list is only a snapshot.
- The Grid file disappears after the test: Managed files follow the session lifecycle and are cleaned up when the session ends or times out. Retrieve the file before ending the session.
- Browser options are ignored: Download preferences differ by browser and may vary by browser version. Use that browser’s Selenium options documentation rather than copying preferences across Chrome, Firefox, and Edge.
- Chrome session fails to start: Confirm the Chrome and ChromeDriver major versions match, and verify that the combination is supported in the environment.
Or skip the browser setup
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