How to get screenshot of full webpage using Selenium and Java?

Question

How to take a screenshot of the entire web page (full-page screenshot), not only partial (top-to-bottom) using Selenium WebDriver?

My code:

Answer 1

Java code without using third party library:

int bodyHeight = webDriver.findElement(By.tagName("body")).getSize().getHeight();
int windowChromeHeight = (int) (long) webDriver.executeScript("return window.outerHeight - window.innerHeight");
Dimension size = new Dimension(webDriver.manage().window().getSize().getWidth(), bodyHeight + windowChromeHeight);
webDriver.executeScript("window.scrollTo(0, 0);");
webDriver.manage().window().setSize(size);
            
File screenshotFile = new File("screenshot.png");
Files.write(screenshotFile.toPath(), webDriver.getScreenshotAs(OutputType.BYTES));