Selenium automates web browsers, primarily so testers can check how web applications behave through user-like browser actions. Use WebDriver to write coded tests, Selenium IDE to record and replay simple interactions, and Selenium Grid to run WebDriver tests remotely across machines and browsers. They are parts of the Selenium project, not interchangeable versions of one testing tool.
What Selenium does—and what it does not
Selenium is a project of browser-automation tools and libraries. Its central coded automation interface, WebDriver, lets test code control a browser through the browser’s automation implementation. The Selenium project describes it this way: “WebDriver uses browser automation APIs provided by browser vendors to control the browser and run tests.” Selenium itself does not provide your application, a complete test strategy, or necessarily the test runner and assertions. Those belong to the application and the surrounding testing setup.
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That distinction is useful when planning a test stack: Selenium performs browser actions; your test code or framework decides what to check and whether the result passes.
What testers use Selenium for
- Automating web flows: exercise navigation, fill and submit forms, and check visible results in a browser.
- Checking browser differences: run important flows in the browsers your users rely on. Browser-specific capabilities and configuration can differ, so confirm requirements for the target browser and version.
- Testing a local app or deployment candidate: point browser tests at an application environment and check its user-facing behavior.
- Scaling or distributing runs: use Grid when tests need remote browser sessions, parallel execution, or a broader machine and platform matrix.
- Prototyping interactions: record and replay a small set of actions with Selenium IDE, then move to coded tests when the case needs more control or maintainability.
Which Selenium component should you use?
| Component | How tests are authored | Where it fits |
|---|---|---|
| WebDriver | Code in a Selenium language binding | Browser control and coded tests; the main route for desktop web automation. |
| Selenium IDE | Record and replay browser actions | Learning commands or making simple recorded cases. The official IDE page lists Chrome, Firefox, and Edge. |
| Selenium Grid | Run WebDriver tests through remote browser instances | Distributing sessions across machines, browsers, or platforms, including parallel runs. |
| Selenium Manager | Driver and selected browser management used by Selenium bindings | Help with discovering, downloading, and caching a driver when one has not been supplied; it is not a test authoring tool. |
These components can complement one another: for example, WebDriver tests can be sent to Grid, while Selenium Manager helps with driver setup. See the official guides for Selenium IDE, Grid, and Selenium Manager.
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What you need to get started with WebDriver
For a basic local WebDriver setup, install a Selenium language binding and a browser, then make the corresponding browser driver available. The exact installation steps depend on your chosen language and browser; follow the current Selenium getting-started guide and the documentation for the browser you intend to automate.
Selenium Manager has shipped with each Selenium release from version 4.6 and can discover, download, and cache drivers when they are not already supplied. Its documentation also describes management of selected Chrome, Firefox, and Edge browser versions. Treat this as a supported setup aid, not a guarantee that every custom environment or browser configuration needs no manual work.
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Selenium documentation covers Chrome, Edge, Firefox, Internet Explorer, and Safari capabilities. That list is not a promise that every version, feature, or legacy driver is equally current. Check browser-specific documentation and current support for your target environment before building a test matrix.
The Tool Desk
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Start with local WebDriver runs for a small suite and a limited browser target. Grid becomes useful when local sequential runs no longer meet the coverage or throughput you need—such as running tests remotely, across platforms, or in parallel. Grid routes tests to remote browser instances; it does not replace the WebDriver tests themselves.
For the basic Grid setup described in Selenium’s quick start, the listed prerequisites are Java 11 or higher, browsers, drivers (or Selenium Manager configuration), and the Selenium Server JAR. The quick start directs WebDriver tests to http://localhost:4444. These are Grid server prerequisites, not requirements for every local WebDriver test. See Getting started with Selenium Grid.
When a hosted browser service may help
If the team needs hosted browser or device coverage, remote execution, parallel capacity, CI integration, or access to a locally hosted test application, compare services against those specific requirements. BrowserStack documents Selenium integration and operational capabilities in its Automate with Selenium documentation; the cited documentation does not establish a price or plan comparison.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How Selenium differs from taking a screenshot
Selenium is for controlling a browser and running tests. A screenshot can help document or inspect a page, but a captured image alone does not exercise a workflow or verify its behavior. For a screenshot-only task, ScreenshotNeo is a separate website screenshot API and MCP server for developers, not a replacement for Selenium tests.
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For a one-off website capture, make one GET request. The example saves the response as a WebP file; replace the target URL and use an access key from your account. See the ScreenshotNeo API documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie or consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in headers. An MCP server provides take_screenshot, get_page_info, and capture_pdf tools for Claude, Cursor, and other MCP clients. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for 1,000 free screenshots a month, with no card required.
Version and compatibility checks
Version information changes. The Selenium downloads page listed 4.49.0 as the stable release on September 9, 2026; check the current downloads page before choosing a version. The browser and driver combination matters as well, so verify the relevant browser documentation and support status for your environment.
A learning resource also needs version context: Selenium WebDriver: From Foundations To Framework describes itself as Selenium 3.0 compatible. It may serve as an older-edition fundamentals resource, but it should not be treated as a current Selenium 4 manual. Book description.
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