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Jpegcrop is a lossless JPEG cropping and rotation utility developed by the Independent JPEG Group, currently available in version 2026 as a single release in the catalog. Falling within the image editing and graphics tools category, the software serves the specific purpose of trimming and rotating JPEG files without any recompression, making it particularly useful for photographers and other users who need to adjust digital camera images while preserving their original quality. The workflow is straightforward: the user selects a frame in the displayed image and saves it as a new file, with additional options accessible through the right mouse popup menu. The program's main feature is its automatic restriction of the left and upper borders of the cropped frame to MCU boundaries, which measure 16x8 in most digital camera pictures and 16x16 or 8x8 otherwise. This automatic adaptation applies in all selection processes, so users see the effective crop area directly, and a visible block margin grid, which can be toggled by menu or button, further supports precise lossless cropping. The status bar continuously tracks the actual selection coordinates in the same format used by the command line jpegtran utility, expressed as "-crop WxH+X+Y", covering width, height, x-offset, and y-offset. Technically, Jpegcrop builds on the original transformation support code of the IJG software through direct function calls, and the "Save Frame As" action causes the file to be re-read and processed in the same manner as jpegtran, which is what avoids recompression entirely. The application is implemented in MS VC++ 6.0 with MFC, and its source code is freely available for download from the JPEGclub.org site, allowing interested developers to inspect or adapt the program. Overall, Jpegcrop addresses the common use case of lossless JPEG manipulation with a focus on transparency about how MCU alignment affects the final cropped result.
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