ksnip

Ksnip is a Qt‑based screenshot utility that runs on Linux, Windows and macOS. It can capture a user‑drawn rectangular region, the last used region, the monitor under the cursor, a full screen, the active window, or the window beneath the cursor, with optional inclusion of the mouse pointer. Captures may be delayed, saved locally, printed, or uploaded directly to services such as imgur, FTP servers, or custom scripts.

After a screenshot is taken, ksnip offers a range of annotation tools including pens, markers, shapes, text, stickers, cropping, blurring, pixelation, and effects like grayscale or drop shadow. Users can also add watermarks, manage multiple images in tabs, and invoke OCR through a plugin.

The program supports global hotkeys (on Windows and X11), command‑line operation with filename wildcards, and user‑defined actions for post‑processing. It can run as a single instance, pin images above other windows, and provides extensive configuration options.