If you open and edit/save JPEG files, they loose quality due to constant re-compression. JPEGcrop utilizes beta code of the Independent JPEG Group for lossless cropping of JPEG files and allows you to crop and rotate your JPEG files without quality loss.
By limiting your crops to fixed aspect ratios, JPEGcrop maintains the JPEG compression that already exists with no need to recompress. Lossless JPEG cropping is a feature that even the $649 Photoshop CS lacks.
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