Most major testing companies allow you to export your genetic data as a .zip or .txt file.
To get your DNA into GEDmatch, you must first from your original testing company (like AncestryDNA or 23andMe) and then upload it to the GEDmatch platform. GEDmatch does not pull your data automatically; it requires a manual transfer of the file. How to Download Raw DNA Data by Provider gedmatch download raw data