DST is an image format that embroidery machines use to make images on clothing such as T-shirts, jackets and hats. To transfer an image, it must be digitized and saved into a .dst file. If you have an image that is a .PNG format, which is a common image format type, you will need to change it to .dst for the embroidery machine to read the image and transfer it correctly onto the clothing.
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Create the image that you want embroidered onto a clothing item. Save it as .png in your image editing software.
Open your Embroidery software and select "file open" from the drop down menu. Find the file you created.
Select "save as" and save it as a .dst file.