jpgFiles = dir('*.jpg') ; % you are in the folder of all jpg files/ you may provde path as well
N = length(jpgFiles) ;
for i = 1:N
% Read
FileName = jpgFiles(i).name ;
img = imread(FileNAme);
% Write
[~,FileName,ext] = fileparts(FileName) ;
OutFile = strcat(FileName,'.tiff') ;
imwrite(img,OutFile);
end
