PES and DST are the two embroidery formats StitchConvert includes in every download. They serve different roles on your machine and in your software.
A PES (Brother) file stores stitch data plus thread-color information for many home embroidery machines and software packages.
If you use Brother embroidery software or a Brother-compatible workflow, PES is usually the file you open first because colors appear on screen.
DST is a universal stitch format. Almost every commercial and home machine can sew from DST, but the file does not store thread names or colors—only stitch paths and color-change stops.
That is normal. Assign thread colors manually in your software when using DST, or rely on the PES file when you want on-screen color previews.
Every paid download is a ZIP with both .pes and .dst so you can use whichever format your machine or software prefers without converting again.
Upload a PNG or SVG, preview the stitch count and thread list, then download once you are satisfied with the preview.