FastStone Capture is a lightweight and versatile screen capture tool for Windows. It allows users to easily capture screenshots of various types, including :

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Full screen:

Captures the entire desktop.
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Active window:

Captures the currently active window.
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Custom region:

Allows users to select a specific area of the screen to capture.
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Scrolling window:

Captures a scrolling window, such as a long webpage, in its entirety.
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Freehand selection:

Captures a freeform area of the screen.

Beyond capturing images, FastStone Capture provides a range of editing features directly within the application:

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Annotation tools:

Add text, arrows, lines, rectangles, and other shapes to screenshots.
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Basic image editing:

Crop, resize, adjust brightness/contrast, and apply other simple edits.
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Watermark addition:

Add a watermark to protect your screenshots.
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Color picker:

Select colors from the screen.

Captured images can be saved in various formats (BMP, GIF, JPEG, PNG, TIFF) and directly uploaded to an image hosting service, emailed, or printed. It also offers advanced features like screen recording (video capture) and scheduled captures.

In short, FastStone Capture is a powerful yet easy-to-use screen capture utility that provides both basic and advanced features for capturing and editing screenshots on Windows. It[SQ]s popular for its speed, simplicity, and comprehensive feature set compared to other, often more bloated, alternatives.