To take a screenshot with Graphics.CopyFromScreen in C#, choose the screen rectangle, create a bitmap with the same dimensions, create a Graphics object for that bitmap, and copy the pixels from the screen into it. The captured bitmap can then be saved as PNG, JPEG, WebP (when supported by your imaging library), or another format.
Microsoft defines CopyFromScreen as performing “a bit-block transfer of color data, corresponding to a rectangle of pixels, from the screen to the drawing surface of the Graphics.” It copies visible screen pixels; it is not a separate hidden-window or webpage renderer.
What Graphics.CopyFromScreen does
The method transfers a rectangular block from a source point on the desktop to a destination point on a Graphics surface. In the usual save-to-file workflow, the destination surface belongs to a bitmap.
- Source point: the screen’s upper-left coordinate for the capture.
- Destination point: where that block begins on the destination graphics surface, commonly
(0, 0). - Size: the width and height of the rectangle to transfer.
There are overloads that accept Point values or separate integer coordinates. Other overloads accept a CopyPixelOperation, which controls how source and destination colors are copied or combined.
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Prerequisites and platform scope
This is a Windows desktop API. Microsoft’s API reference lists it for Windows Desktop versions 3.0 through 11, with applicability entries for .NET Framework and .NET Standard. Select a Windows-capable target framework and test on the desktop session where the capture will run; do not treat it as a universal cross-platform screenshot API.
For modern .NET projects, a Windows Forms or WPF application is the normal host. A console program can also call the method when it runs in an interactive Windows desktop session and references the appropriate System.Drawing assemblies.
Capture a region and save it as PNG
The following complete example captures a 640-by-480 region beginning at screen coordinate (100, 100) and saves it as a PNG. The bitmap and graphics objects are disposed automatically.
using System.Drawing;
using System.Drawing.Imaging;
int sourceX = 100;
int sourceY = 100;
int width = 640;
int height = 480;
string outputPath = @"C:Tempregion.png";
using (var bitmap = new Bitmap(width, height))
using (var graphics = Graphics.FromImage(bitmap))
{
graphics.CopyFromScreen(
sourceX,
sourceY,
0,
0,
bitmap.Size,
CopyPixelOperation.SourceCopy);
bitmap.Save(outputPath, ImageFormat.Png);
}CopyPixelOperation.SourceCopy requests a direct source copy. The overload without that final argument is simpler and is suitable when the default operation meets your needs.
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Using Point values
using System.Drawing;
Point source = new Point(100, 100);
Point destination = Point.Empty;
Size size = new Size(640, 480);
graphics.CopyFromScreen(source, destination, size);The destination point is relative to the bitmap-backed graphics surface, not another screen coordinate system. For a bitmap created at the capture size, (0, 0) places the first captured pixel at the bitmap’s first pixel.
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Capture the entire primary display
In Windows Forms, Screen.PrimaryScreen.Bounds supplies the primary display’s bounds. Use its location as the source point and its size for the bitmap.
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
var bounds = Screen.PrimaryScreen.Bounds;
string outputPath = @"C:Tempprimary-display.png";
using (var bitmap = new Bitmap(bounds.Width, bounds.Height))
using (var graphics = Graphics.FromImage(bitmap))
{
graphics.CopyFromScreen(
bounds.X,
bounds.Y,
0,
0,
bounds.Size,
CopyPixelOperation.SourceCopy);
bitmap.Save(outputPath, ImageFormat.Png);
}Compile this example in a Windows desktop project with Windows Forms enabled. The exact display bounds should be selected by your application rather than assumed to start at coordinate zero.
Capture a selected rectangle
A reusable method keeps rectangle validation and resource management in one place.
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using System.Drawing;
using System.Drawing.Imaging;
static void SaveScreenRectangle(Rectangle capture, string path)
{
if (capture.Width <= 0 || capture.Height <= 0)
throw new ArgumentException("Capture rectangle must have positive dimensions.", nameof(capture));
using (var bitmap = new Bitmap(capture.Width, capture.Height))
using (var graphics = Graphics.FromImage(bitmap))
{
graphics.CopyFromScreen(
capture.X,
capture.Y,
0,
0,
capture.Size,
CopyPixelOperation.SourceCopy);
bitmap.Save(path, ImageFormat.Png);
}
}
SaveScreenRectangle(new Rectangle(100, 100, 800, 600), @"C:Tempcapture.png");Use PNG for lossless UI text and diagrams. JPEG produces smaller files for photographic content but introduces compression artifacts. The path, file extension, and image format are application choices; ensure the destination directory exists and the process has write permission.
Use the call in a Windows Forms Paint event
Microsoft’s example calls CopyFromScreen from a form’s Paint event, using the form location as the source, destination (40, 40), and a 100 x 100 region.
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private void Form1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.CopyFromScreen(
Location,
new Point(40, 40),
new Size(100, 100));
}This draws the copied pixels directly into the form. If you need a file, use a bitmap-backed graphics surface as shown earlier. Avoid capturing repeatedly in Paint unless you intentionally need a live view; repaint frequency can make disk writes and allocations expensive.
Coordinates, displays, and sizing
Choose one rectangle
Define the source rectangle before allocating the bitmap. Its width and height must match the bitmap dimensions you intend to fill. A mismatch can crop the result or leave portions of the destination unchanged.
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Multiple monitors
For a desktop spanning several displays, obtain the desired display or virtual-desktop rectangle from your Windows UI framework, then pass that rectangle’s X, Y, Width, and Height. Displays can have negative coordinates when one monitor is positioned left or above another. Do not hard-code an assumption that every monitor begins at (0, 0).
DPI and remote sessions
The API reference establishes rectangular screen transfer, but it does not define every mixed-DPI, DPI-virtualization, protected-content, headless-session, or remote-desktop behavior. If exact physical-pixel dimensions matter, test the application with the DPI-awareness configuration and session types you support.
CopyPixelOperation choices
The overload with CopyPixelOperation lets you request a raster operation. SourceCopy is the straightforward choice for a screenshot because it replaces destination pixels with source pixels. Other enum values can blend or combine colors, but an invalid value can raise InvalidEnumArgumentException. Keep the operation explicit when reviewing or maintaining capture code.
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Performance and reliability practices
- Allocate the bitmap once when taking a series of captures at a fixed size, rather than allocating on every timer tick.
- Save asynchronously or queue file writes if capture happens on a UI thread; encoding and disk I/O can make the interface unresponsive.
- Use a bounded capture size and avoid retaining many large bitmaps, which can exhaust process memory.
- Dispose every
GraphicsandBitmappromptly withusingstatements. - Check the return path and catch exceptions around the capture and save operations so a transient desktop failure does not terminate the application.
Troubleshooting
Win32Exception during CopyFromScreen
Microsoft documents Win32Exception when the operation fails. Verify that the process is running in an available interactive Windows desktop session, that the rectangle is valid, and that the destination graphics surface was created successfully. Log the exception’s message and native error information for diagnosis.
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InvalidEnumArgumentException
This indicates an invalid CopyPixelOperation value. Use a defined enum member such as SourceCopy, or call the overload that does not take the operation.
Black, blank, or incomplete output
Confirm that the source coordinates identify the intended visible desktop area and that the bitmap dimensions equal the capture size. Check whether the program is running without an interactive desktop, through a remote session, or against content that the operating system does not expose as ordinary screen pixels. Those cases require environment-specific testing.
The file is not created
Check that the directory exists, the path is not locked by another process, and the account has write permission. Select an image encoder matching the intended format instead of relying only on a filename extension.
The screenshot is the wrong size
Compare the rectangle passed to CopyFromScreen with the bitmap’s Width and Height. Also check display scaling and the DPI-awareness configuration of the Windows application.
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When CopyFromScreen is the wrong tool
Use this API when you need visible desktop pixels from a rectangular region. Consider another approach when you need the contents of a specific window without regard to what is visible, a browser page rendered independently of the desktop, or a cross-platform capture framework. The official reference establishes the screen-region transfer, not detailed performance comparisons with those alternatives.
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Frequently Asked Questions
Can CopyFromScreen capture a hidden window?
No. It copies pixels from a visible screen rectangle to a Graphics surface; it is not documented as an independent hidden-window renderer.
Which image format should I use?
PNG is generally appropriate for lossless interface captures. JPEG is useful when smaller photographic files matter, at the cost of compression artifacts.
Does the method work on macOS or Linux?
The cited API documentation lists Windows Desktop applicability. Treat it as a Windows-focused API and choose a platform-specific alternative for other operating systems.
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