Yes, use a shareware program like Irfanview on Windows, or GraphicConverter on Macintosh. See the Related Links below.
.jpeg, .bmp, .png
You can Use XnView that is available for free to download to convert files.
jpeg is smaller (followed by png, gif and a bmp-which is largest).
MSPaint can compress *.bmp files as JPEG, TIFF, PNG and GIF.
If a file is created or edited in Paint then it can be saved with a number of format extensions such as PNG or JPEG or BMP. The most common one people use is JPEG.
The effect of the GIF,JPEG,PNG,BMP and TIFF on the data transfer
JPEG and BMP image types use different programs and algorithms to record and store the data. The BMP (bitmap) is the older format while the JPEG (Joint Photographic Experts Group) format is more recent. One difference between a JPEG and a BMP file is that the bitmap file is larger in size. This is due to the JPEG file being compressed which in turn causes a loss in picture quality.
CorelDraw files (.CDR) use a is a vector format, And the Jpeg is raster. You can import the jpeg into CorelDraw and then "Save As" .CDR
Wikimedia Commons has files with 11 different types of extensions available for use. Of those 11, they recommend, JPEG, SVG, PNG, or XCF. They do not allow BMP files.
Usually pictures of JPEG or BMP occupy more space than the GIF which occupies the low space. In JPEG and BMP there is space for the background also.
DAT file are binary files with text. They can be opened in Word. They aren't pictures that can be converted into JPEGs.
Text files have to be image files compatible with Windows Movie Maker:.bmp, .dib, .emf, .gif, .jfif, .jpe, .jpeg, .jpg, .png, .tif, .tiff, .wmf