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Use Pillow’s ImageGrab.grab() to capture the current desktop, then save the returned image. Call ImageGrab.grab(bbox=(left, top, right, bottom)) when you need only a rectangle. The exact pixels, color mode, monitor coverage, and even whether capture works depend on your operating system, display server, Pillow version, and desktop permissions.
This guide covers full-screen, regional, multi-monitor, and single-window captures, Retina sizing, Linux display requirements, verification, troubleshooting, and an API alternative for capturing web pages rather than your local desktop.
Install Pillow and verify the environment
Install or upgrade Pillow in the Python environment that will run the capture:
python -m pip install --upgrade PillowCheck the installed version and confirm that Python imports the package:
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python -c "import PIL; print(PIL.__version__)"Pillow’s platform-support page distinguishes continuously tested operating systems from platforms reported to work, so a listed operating system does not guarantee that every local display session can be captured. See the official platform-support documentation for that distinction.
Capture the entire primary screen
Import ImageGrab, call grab() without arguments, and save the returned PIL image:
from PIL import ImageGrab
screenshot = ImageGrab.grab()
screenshot.save("screenshot.png")By default, Pillow copies the entire screen available through the platform capture path. The result is a normal PIL image, so you can inspect it, convert it, resize it, or save it in formats supported by your Pillow installation.
Choose an output format
The filename extension usually selects the encoder. PNG is lossless and appropriate for text or interface screenshots; JPEG is smaller but introduces compression artifacts; WebP can provide a smaller file when your Pillow build includes WebP support.
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from PIL import ImageGrab
image = ImageGrab.grab()
image.save("desktop.png")
image.save("desktop.jpg", quality=90)
image.save("desktop.webp", quality=85)Use a format whose encoder is available in your installation. If saving fails, try PNG first and inspect the exception message.
Capture a rectangular region with bbox
Pass a four-value bounding box in screen coordinates: (left, top, right, bottom). The right and bottom values mark the far edge of the region.
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from PIL import ImageGrab
region = ImageGrab.grab(bbox=(100, 100, 800, 600))
region.save("region.png")This example requests the rectangle from x=100 through x=800 and y=100 through y=600 in the desktop coordinate system. Coordinates are not automatically relative to the active window. On a multi-monitor desktop, they follow the virtual screen layout, which can include negative values.
Validate the captured geometry
Before processing a region, print its dimensions and mode:
from PIL import ImageGrab
image = ImageGrab.grab(bbox=(100, 100, 800, 600))
print("size:", image.size)
print("mode:", image.mode)
image.save("region.png")A malformed or out-of-place box can produce an unexpected size or an empty-looking result. Measure coordinates against the same display arrangement and scaling used by the process taking the screenshot.
Understand image modes and Retina dimensions
Windows and Linux modes
The API documentation states that captures are generally RGB on platforms other than macOS. RGB images have three color channels and can be saved directly as PNG or JPEG.
macOS mode and Retina scale
macOS captures are RGBA, which adds an alpha channel. Code that requires RGB can convert explicitly:
from PIL import ImageGrab
image = ImageGrab.grab()
rgb = image.convert("RGB")
rgb.save("mac-screen.jpg", quality=90)On Retina displays, the physical capture can be twice the logical width and height. Pillow 12.3.0 added the keyword-only scale_down=True option to request 1× sizing. Use it only when the installed Pillow version supports it:
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from PIL import ImageGrab
image = ImageGrab.grab(scale_down=True)
print(image.size)
image.save("retina-1x.png")Without that option, retain the higher-resolution image when you need pixel-level detail. Check image.size rather than assuming that logical display dimensions equal the returned pixel dimensions. The option and Retina behavior are documented in the ImageGrab reference and the Pillow 12.3.0 release notes.
Capture every monitor on Windows
Windows supports all_screens=True to request the complete virtual desktop instead of only the primary display:
from PIL import ImageGrab
all_monitors = ImageGrab.grab(all_screens=True)
print(all_monitors.size)
all_monitors.save("all-monitors.png")When monitors are arranged to the left or above the primary display, the virtual desktop’s top-left coordinate can be negative. Supply such coordinates in bbox when cropping across the full layout. The Windows-only include_layered_windows option can include layered windows when supported by your installed Pillow version.
Capture one window on supported systems
The window argument captures a single window by native identifier: an HWND on Windows or a CGWindowID on macOS. Pillow added Windows support in 11.2.1 and macOS support in 12.1.0. Older installations may reject the argument.
from PIL import ImageGrab
# Replace WINDOW_ID with an HWND (Windows) or CGWindowID (macOS).
image = ImageGrab.grab(window=WINDOW_ID)
image.save("window.png")You must obtain the native identifier through operating-system APIs or another window-management tool; ImageGrab does not discover a window from its title. If the argument is unavailable, upgrade Pillow or capture a coordinate rectangle instead.
Linux display requirements and fallbacks
On Linux, ImageGrab.grab() uses an X11 display path when xdisplay is None. If the default X11 capture does not return an image, Pillow may use an installed gnome-screenshot, grim, or spectacle utility. Pass xdisplay="" to disable that fallback behavior:
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from PIL import ImageGrab
image = ImageGrab.grab(xdisplay="")
image.save("linux-screen.png")Use the default first. Disable fallbacks only when you deliberately want to prevent external utility calls. Pillow documents checking XCB support with:
from PIL import features
print(features.check_feature(feature="xcb"))Clipboard image capture on Linux, where used, requires wl-paste or xclip. A headless shell, an unavailable X11/Wayland session, or a process without access to the graphical display can prevent capture regardless of Python code.
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This command-line example supports a full screen or a rectangle, prints the result, and converts macOS RGBA output only when JPEG is requested:
import argparse
from pathlib import Path
from PIL import ImageGrab
parser = argparse.ArgumentParser()
parser.add_argument("output", nargs="?", default="screenshot.png")
parser.add_argument("--bbox", nargs=4, type=int, metavar=("LEFT", "TOP", "RIGHT", "BOTTOM"))
parser.add_argument("--all-screens", action="store_true")
parser.add_argument("--scale-down", action="store_true")
args = parser.parse_args()
kwargs = {"all_screens": args.all_screens}
if args.bbox:
kwargs["bbox"] = tuple(args.bbox)
if args.scale_down:
kwargs["scale_down"] = True
image = ImageGrab.grab(**kwargs)
output = Path(args.output)
if output.suffix.lower() in {".jpg", ".jpeg"} and image.mode not in {"RGB", "L"}:
image = image.convert("RGB")
image.save(output)
print(f"saved {output} ({image.size[0]}x{image.size[1]}, {image.mode})")Examples:
python capture.py desktop.png
python capture.py panel.png --bbox 100 100 800 600
python capture.py monitors.png --all-screens
python capture.py retina.png --scale-downDo not pass --scale-down to a Pillow version that predates 12.3.0. For a script that must run across mixed versions, detect support by checking the installed version or handle the resulting TypeError and retry without that keyword.
Troubleshoot blank, failed, or incorrect screenshots
Import or installation errors
- “No module named PIL”: run
python -m pip install Pillowwith the same Python executable used to launch the script. - Unexpected keyword argument: your Pillow version may not support
scale_downorwindowon that operating system. CheckPIL.__version__and upgrade when appropriate.
Black, blank, or missing output
- Confirm the process has an interactive graphical session rather than a headless service account.
- On Linux, verify X11/XCB availability and install the documented fallback utility when your desktop requires one.
- On macOS, check the operating system’s screen-recording permission for the application running Python.
- Print
image.sizeandimage.modebefore downstream processing to distinguish a capture problem from a display or conversion problem.
Wrong area or monitor
- Recheck that
bboxis ordered left, top, right, bottom, not x, y, width, height. - Use the virtual-desktop coordinate system. Negative coordinates are valid on Windows when a monitor lies left or above the primary display.
- Account for display scaling and Retina physical pixels by measuring the returned image rather than assuming logical dimensions.
Permission and security boundaries
Operating-system permissions, remote-desktop policies, compositor behavior, and protected-content rules can block or alter a screenshot. Pillow’s documentation describes API behavior, not a universal permission prompt or guarantee for every desktop environment.
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Capturing a full multi-monitor desktop creates more pixels than capturing a small bbox, so crop at capture time when you know the target area. Save to a local writable path and close or overwrite files according to your workflow. For repeated captures, avoid unnecessary format conversions; PNG preserves interface text but can be larger, while JPEG encoding trades size for artifacts.
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For reliable automation, log the timestamp, requested box, returned size, mode, output path, and exception text. Treat a successful Python call as evidence that an image object was returned, not proof that every window or protected surface was visible. Verify the file exists and has nonzero size before uploading it.
Or skip the browser setup
ImageGrab captures the desktop where Python is running. If what you need is a clean screenshot of a public web page, ScreenshotNeo makes one GET request and returns PNG, JPEG, WebP, or PDF. Its capture flow accepts cookie and consent banners before removing more than 60 known consent platforms, newsletter popups, and chat widgets; each cleanup step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing result.
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open("shot.webp", "wb").write(r.content)Node.js:
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- Use ImageGrab for the desktop, a local application window, or a coordinate region on the machine running Python.
- Use
all_screens=Truewhen Windows virtual-desktop coverage is required. - Use ScreenshotNeo when the target is a web URL, you need repeatable server-side rendering, or an AI agent should request captures through MCP.
Frequently Asked Questions
Does ImageGrab capture a browser page without the browser being visible?
No. ImageGrab captures the desktop or supported native window visible to the operating-system capture path. It does not render a URL independently of a local graphical session.
Can I use a four-value box as x, y, width, height?
No. Pillow expects (left, top, right, bottom). Calculate the right and bottom edges before calling grab().
Why is a macOS screenshot larger than my display resolution?
Retina capture can return physical pixels at 2× logical dimensions. Pillow 12.3.0 and later can request 1× output with scale_down=True.
Is ImageGrab available in a server or Docker container?
Only when the process has access to a usable graphical display and the required platform capture path. A headless container normally needs a separately configured display server.
Quick Recap
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