On Windows, take a PowerShell screenshot with System.Drawing by creating a Bitmap, copying pixels into it with Graphics.CopyFromScreen, and saving the bitmap. The script below captures the primary display as a PNG, disposes its graphics resources safely, and can be adapted to any screen rectangle.
Capture the primary screen
Run this in Windows PowerShell 5.1 or PowerShell 7 on Windows. It loads the drawing and Windows Forms assemblies, reads the primary display bounds, creates a bitmap of the same size, copies the screen pixels, and writes a PNG file.
param(
[string]$Path = (Join-Path (Get-Location) 'screen.png')
)
Add-Type -AssemblyName System.Drawing
Add-Type -AssemblyName System.Windows.Forms
$bounds = [System.Windows.Forms.Screen]::PrimaryScreen.Bounds
$bitmap = [System.Drawing.Bitmap]::new($bounds.Width, $bounds.Height)
$graphics = [System.Drawing.Graphics]::FromImage($bitmap)
try {
$graphics.CopyFromScreen(
$bounds.Location,
[System.Drawing.Point]::Empty,
$bounds.Size
)
$bitmap.Save($Path, [System.Drawing.Imaging.ImageFormat]::Png)
Write-Host "Saved screenshot to $Path"
}
finally {
$graphics.Dispose()
$bitmap.Dispose()
}Save it as Capture-Screen.ps1, then run:
.[Capture-Screen.ps1[ -Path 'C:Tempscreen.png'The CopyFromScreen call performs a bit-block transfer of color data from the screen to the Graphics surface, as documented in the Microsoft Learn API reference. It does not create a file by itself; the subsequent Bitmap.Save call does that.
Capture a selected rectangle
A screenshot is a rectangle defined by a source point and a size. Set the rectangle explicitly when you need a window area, a toolbar, or a fixed region rather than the whole primary display.
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param(
[int]$X = 100,
[int]$Y = 100,
[int]$Width = 1200,
[int]$Height = 800,
[string]$Path = (Join-Path (Get-Location) 'region.png')
)
Add-Type -AssemblyName System.Drawing
$source = [System.Drawing.Point]::new($X, $Y)
$size = [System.Drawing.Size]::new($Width, $Height)
$bitmap = [System.Drawing.Bitmap]::new($size.Width, $size.Height)
$graphics = [System.Drawing.Graphics]::FromImage($bitmap)
try {
$graphics.CopyFromScreen(
$source,
[System.Drawing.Point]::Empty,
$size
)
$bitmap.Save($Path, [System.Drawing.Imaging.ImageFormat]::Png)
Write-Host "Saved $Width x $Height pixels from ($X, $Y) to $Path"
}
finally {
$graphics.Dispose()
$bitmap.Dispose()
}For example, .[Capture-Region.ps1[ -X 0 -Y 0 -Width 800 -Height 600 copies the rectangle whose top-left corner is (0, 0). Coordinates are desktop coordinates, not coordinates relative to the bitmap. A monitor positioned to the left or above the primary display can therefore have negative X or Y values.
Understand the capture pipeline
1. Load the required assemblies
Add-Type -AssemblyName System.Drawing provides Bitmap, Graphics, and image formats. System.Windows.Forms is used in the full-screen example only to obtain Screen.PrimaryScreen.Bounds. If you already know the rectangle, the selected-region script needs only System.Drawing.
2. Choose source coordinates and size
CopyFromScreen receives a source location, a destination location inside the bitmap, and a Size. Using Point.Empty as the destination starts writing at the bitmap’s upper-left corner. The source location and size must describe the part of the desktop you actually want.
3. Allocate the bitmap and graphics object
The bitmap dimensions determine the output dimensions. Graphics.FromImage($bitmap) gives GDI+ a drawing surface to receive the copied pixels.
4. Save with an explicit format
Pass an ImageFormat instead of relying on a filename extension. PNG is useful for text and interface screenshots because it preserves lossless pixels. GDI+ also documents BMP, GIF, EXIF, JPEG, and TIFF formats; select one deliberately when your consumer requires it.
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5. Dispose resources
The finally block runs whether capture and saving succeed or fail. Disposing both Graphics and Bitmap releases their native resources and avoids leaving handles open in a long-running script.
Choose another display or an arbitrary monitor layout
PrimaryScreen is only one display. Enumerate [System.Windows.Forms.Screen]::AllScreens and inspect each screen’s bounds before selecting one.
Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.Screen]::AllScreens |
Select-Object DeviceName, Primary, BoundsAfter identifying a device, use its Bounds in the same capture pattern:
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Where-Object { $_.DeviceName -eq '\.DISPLAY2' }
if ($null -eq $screen) {
throw 'The requested display was not found.'
}
$bounds = $screen.Bounds
$bitmap = [System.Drawing.Bitmap]::new($bounds.Width, $bounds.Height)
$graphics = [System.Drawing.Graphics]::FromImage($bitmap)
try {
$graphics.CopyFromScreen($bounds.Location, [System.Drawing.Point]::Empty, $bounds.Size)
$bitmap.Save('C:Tempdisplay2.png', [System.Drawing.Imaging.ImageFormat]::Png)
}
finally {
$graphics.Dispose()
$bitmap.Dispose()
}Do not assume that a virtual desktop starts at (0, 0). In a multi-monitor arrangement, the bounds can extend into negative coordinates. Capture the exact Location and Size returned by the selected Screen object.
Save JPEG or another GDI+ format
Change the format argument while keeping the capture code unchanged:
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$bitmap.Save('C:Tempscreen.jpg', [System.Drawing.Imaging.ImageFormat]::Jpeg)
# Other documented choices include Bmp, Gif, Exif and Tiff.Keep the filename extension and the format argument consistent. If a receiving application expects PNG, continue to pass ImageFormat.Png even when the path is assembled dynamically.
PowerShell and .NET version limits
| Environment | What to expect | Practical guidance |
|---|---|---|
| Windows PowerShell 5.1 | Runs on the .NET Framework and is Windows-specific. | Use the scripts as shown and confirm the assemblies are available on the machine. |
| PowerShell 7.x on Windows | Runs on modern .NET; System.Drawing.Common is supported on Windows. |
Use a Windows PowerShell session and verify the installed runtime if assembly loading fails. |
| PowerShell 7.x on macOS or Linux | PowerShell itself is cross-platform, but Microsoft documents System.Drawing.Common as Windows-only in .NET 6 and later. |
Do not treat this recipe as a portable desktop-capture solution; use a platform-appropriate library instead. |
Microsoft’s Bitmap documentation states that, in .NET 6 and later, the System.Drawing.Common package is supported only on Windows. Microsoft’s overview of differences between Windows PowerShell 5.1 and PowerShell 7.x explains why the host version matters.
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Validate dimensions and create the destination folder
if ($Width -le 0 -or $Height -le 0) {
throw 'Width and Height must be positive integers.'
}
$directory = Split-Path -Parent $Path
if ($directory -and -not (Test-Path -LiteralPath $directory)) {
New-Item -ItemType Directory -Path $directory -Force | Out-Null
}Place these checks before constructing the bitmap. A zero or negative size is an input error, not a screen-capture failure.
Prevent accidental overwrites
Use Test-Path and choose a new name, or write to a temporary file and move it into place after Save succeeds. A destination file that is open in another program can cause the save operation to fail.
Keep capture and file I/O separate
Capture first, then save inside the same try block. If a scheduled job needs to process the image, close the bitmap before handing the path to another process; the finally block guarantees that cleanup occurs.
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Troubleshoot common failures
| Symptom | Likely cause | Fix |
|---|---|---|
Add-Type cannot load an assembly |
The session is not running on Windows, the required runtime is missing, or the assembly name is unavailable in that edition. | Check $PSVersionTable, confirm Windows, and verify the installed .NET/PowerShell runtime. On non-Windows PowerShell 7, use another capture library. |
CopyFromScreen throws Win32Exception |
The API reports this exception when the screen operation fails; the exact cause depends on the desktop and display context. | Check that the source rectangle is valid, the target display is active, and the process is running in an interactive Windows desktop session. |
| The image shows the wrong monitor | The script used PrimaryScreen or coordinates relative to the wrong display. |
Inspect AllScreens, select the intended Bounds, and use its location and size. |
| The crop is offset or clipped | The source point, width, or height does not match the desktop coordinate system. | Print the chosen coordinates, account for negative multi-monitor coordinates, and reduce the rectangle to a known visible area. |
| The file is missing or cannot be opened | The directory does not exist, the process lacks write permission, or another process has the file open. | Use an absolute writable path, create the directory first, and choose a new filename. |
| A scheduled task captures a blank or unexpected desktop | Services and unattended tasks may not have the same interactive desktop as a logged-in user. | Test in the exact account and session used by the task. Do not assume an unattended process can see an interactive user’s display. |
Microsoft’s CopyFromScreen reference specifically documents Win32Exception when the operation fails. It does not promise identical behavior for remote sessions, services, scheduled tasks, DPI-scaling configurations, or every multi-monitor arrangement, so validate those deployment conditions on the target machine.
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Use the one-call endpoint documented at ScreenshotNeo’s documentation:
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$q = @{
access_key = 'YOUR_API_KEY'
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}
Invoke-WebRequest -Uri 'https://api.screenshotneo.com/v1/shot' -Body $q -OutFile 'shot.webp'cURL
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython
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open("shot.webp", "wb").write(r.content)Node.js
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FAQ
Does CopyFromScreen capture a minimized or hidden window?
No. It copies pixels currently available from the desktop drawing surface. Bring the desired content into the visible capture rectangle or use an application-specific automation approach.
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Can I capture only one application by passing its window title?
Not with CopyFromScreen alone. The method accepts screen coordinates and a size; obtaining a window rectangle requires separate Windows window-management code.
Why is my high-DPI screenshot a different size than expected?
DPI awareness and display scaling affect the coordinates and bounds reported by the Windows session. Check the actual Screen.Bounds values on the machine where the script runs rather than assuming physical-pixel dimensions.
Frequently Asked Questions
Does CopyFromScreen capture a minimized or hidden window?
No. It copies pixels currently available from the desktop drawing surface; the content must be visible in the capture rectangle.
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Can I capture only one application by passing its window title?
Not with CopyFromScreen alone. It accepts screen coordinates and a size, so window-specific capture requires separate Windows window-management code.
Why is my high-DPI screenshot a different size than expected?
DPI awareness and display scaling affect reported coordinates and bounds. Inspect Screen.Bounds on the target machine instead of assuming physical-pixel dimensions.
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