Free raw DNA merger
Merge two raw DNA files into one
Two chips test different positions: 23andMe and AncestryDNA share only part of theirs. Drop two raw files from the same person and get one file with every position from both, plus where they overlap and where they disagree.
It runs in your browser. Your file is never uploaded, there is no account, and it is free. We count that a merge ran and its outcome, never the files, their names or any genotype.
First file
Choose file
.txt · .csv · .zip
Second file
Choose file
.txt · .csv · .zip
Run the full analysis on this file
The free DNA report reads the same file for ancestry across 15 world regions, traits, medication genes and both family lines. Your DNA story opens straight away with no account; the full report opens after a code sent to your email.
How the merge works
- The two files are lined up by chromosome and position, in your browser, whatever company made them.
- Where both have a call and agree, the merged file has it once. Where they disagree, it has a no-call, because one of the two chips is wrong there. Where one file has a no-call and the other a call, it has the call. Positions only one file tested are copied.
- Before writing anything it checks that shared rsIDs sit at the same positions (the same genome build) and that the two files agree where both called a position (the same person).
- You choose the layout of the result: 23andMe, AncestryDNA, MyHeritage, FamilyTreeDNA, Living DNA or PLINK.
Questions
How do I merge my 23andMe and AncestryDNA raw data into one file?
Drop both files on healthosx.com/dna/merge. It lines them up by position in your browser, keeps every position either file tested, writes a no-call where they disagree, and gives you one file in the layout you choose, with counts of the overlap and the disagreements. Free, no account, and neither file is uploaded.
What happens where the two files disagree?
That position becomes a no-call in the merged file and is counted. One of the two chips misread it, and nothing in the files says which, so writing either letter would be a guess.
Can I merge files from two different people?
No. Where both files have a call they must agree on at least 95% of positions; two people agree on far fewer, and the merge is refused. A file mixing two people’s DNA would be wrong for both.
Where can I use the merged file?
Anywhere that takes the layout you chose. Some sites cap the number of positions or treat combined files differently from a single test, so check their rules first. The free report at /dna reads the merged file like any other.