How can I take a screenshot with Selenium WebDriver?

Java

Yes, it is possible. The following example is in Java:

WebDriver driver = new FirefoxDriver();
driver.get("http://www.google.com/");
File scrFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
// Now you can do whatever you need to do with it, for example copy somewhere
FileUtils.copyFile(scrFile, new File("c:\\tmp\\screenshot.png"));

Python

Each WebDriver has a .save_screenshot(filename) method. So for Firefox, it can be used like this:

from selenium import webdriver

browser = webdriver.Firefox()
browser.get('http://www.google.com/')
browser.save_screenshot('screenie.png')

Confusingly, a .get_screenshot_as_file(filename) method also exists that does the same thing.

There are also methods for: .get_screenshot_as_base64() (for embedding in HTML) and .get_screenshot_as_png()(for retrieving binary data).

And note that WebElements have a .screenshot() method that works similarly, but only captures the selected element.

C#

public void TakeScreenshot()
{
    try
    {            
        Screenshot ss = ((ITakesScreenshot)driver).GetScreenshot();
        ss.SaveAsFile(@"D:\Screenshots\SeleniumTestingScreenshot.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
    }
    catch (Exception e)
    {
        Console.WriteLine(e.Message);
        throw;
    }
}

JavaScript (Selenium-Webdriver)

driver.takeScreenshot().then(function(data){
   var base64Data = data.replace(/^data:image\/png;base64,/,"")
   fs.writeFile("out.png", base64Data, 'base64', function(err) {
        if(err) console.log(err);
   });
});