Raw DNA file check

Consumer testing companies each export raw data in their own text format, with different column layouts, different marker naming and very different marker counts. This diagnostic parses the file you give it, reports which vendor format it detected, counts the usable markers it found on each chromosome, and states which of our analyses can actually read it. It is a read-only check: nothing is ordered, and the file is not stored.

Marker count is the number that decides what a file can support, and it is the one nobody is told. Autosomal marker density governs how precisely an admixture model can be fitted; the Y-chromosome and mitochondrial rows govern whether a paternal or maternal haplogroup can be read at all. Files from the same company differ by chip generation, and some products carry no Y rows whatsoever — which is why a file can work perfectly for one analysis and be unusable for another.

Seeing the per-chromosome breakdown before you buy anything is the point. A file thin in autosomal markers will still produce an admixture model, but with wider standard errors, and no amount of analyst effort recovers coverage the file never had. What this check cannot do is judge the data's quality beyond what the file states: it counts what is present and reports the format, but cannot detect a mislabelled sample, a mixed-up kit, or genotyping error in individual calls. Runs need a free, email-verified account.