- 1). Navigate to the BMP file in the Finder. Press "Ctrl" and simultaneously click on the file to bring up the contextual menu. Highlight "Open With" and select "Preview." Preview will open the BMP.
- 2). Open the "File" menu in Preview. Select "Save As."
- 3). Enter the name for the converted file in the text box of the "Save As" window. Select the location where Preview should save the file.
- 4). Use the "Format" drop-down menu to select the "JPEG" format. Adjust the "Quality" if desired. Higher quality files have a greater file size. The quality of the file cannot improve beyond that of the original.
- 5). Press "Save" to convert the file to JPEG.
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