Free tool · no account · no upload
Convert your raw DNA file, without uploading it
Drop a raw DNA export from 23andMe, AncestryDNA, MyHeritage or FamilyTreeDNA and download it in any of the other formats. The conversion runs entirely in your browser: it rewrites the file's layout — delimiter, header, chromosome naming, no-call symbol — and never touches your genotypes, positions or genome build. No byte of your DNA ever leaves this device.
Drop your raw DNA file here
or choose it from your device
Accepts the original .txt or .csv exports from 23andMe, AncestryDNA, MyHeritage and FamilyTreeDNA. Unzip a .zip first.
Private by construction: the file is read and rewritten locally with your browser's File API. There is no upload button and no network call — you can disconnect from the internet before choosing the file. Other online converters process your DNA on their server; this one cannot.
What a format conversion is — and what it is not
- It rewrites the file's representation: delimiter, column header, chromosome naming and the no-call symbol. Your rsIDs, positions and genotype letters pass through unchanged.
- It does not change the genome build, and it never infers one. If the source header declares a build, the converted file repeats it, unverified.
- It does not perform liftover, strand flips or imputation, and it cannot turn one chip's marker list into another's: positions the source chip never tested are not in the file, and no format change can add them.
- It never forges a provider's header. The output opens with an honest comment naming the real source — a converted file is a converted file, not a counterfeit export.
- Every change of representation is counted and shown in the conversion report, including the rows that could not be carried over.
Format compatibility is not platform acceptance
Whether a company accepts an uploaded file is that company's decision, made by their upload pipeline — not something any converter can promise. The honest status, per target format:
- 23andMe
- 23andMe does not accept raw data uploads from other companies at all. A file in 23andMe format is useful for the many third-party tools that only read that format — not for creating a 23andMe profile.
- AncestryDNA
- AncestryDNA does not accept raw data uploads from other companies. The AncestryDNA format matters when a third-party tool expects that exact five-column layout.
- MyHeritage
- MyHeritage stopped accepting DNA uploads from other providers in 2025 — its own help centre states that uploads are no longer supported. A file in MyHeritage format is still useful for third-party tools that read that layout.
- FamilyTreeDNA
- FamilyTreeDNA's autosomal transfer still accepts uploads from the major providers, with version restrictions on their side (tests on some newer chips are not compatible). Their rules are theirs and can change.
Popular conversions
Each guide explains exactly what changes between the two formats — and what does not.
The four formats, side by side
| 23andMe | AncestryDNA | MyHeritage | FamilyTreeDNA | |
|---|---|---|---|---|
| File extension | .txt | .txt | .csv | .csv |
| Column separator | tab | tab | comma | comma |
| Chromosome naming | 1–22, X, Y, MT | 1–22, 23 (X), 24 (Y), 25 (XY), 26 (MT) | 1–22, X, Y, XY, MT | 1–22, X, Y, XY, MT |
| No-call symbol | -- | 0 0 | -- | -- |
Converter questions
Does my DNA leave my device?
No. The file is read, converted and rewritten in your browser with the File API. There is no upload and no network call in this flow — the privacy promise is architectural, not a policy. Most online DNA converters run on a server, which means sending your genome to someone else's machine to change some columns.
Does the conversion change my genotypes or genome build?
No. Only the representation changes: delimiter, header, chromosome naming and the no-call symbol. Genotype letters, rsIDs and positions are byte-identical, and the genome build is neither changed nor guessed.
Will the platform I convert for actually accept the file?
Of these four, only FamilyTreeDNA still accepts raw data uploads, with version restrictions on their side. 23andMe and AncestryDNA never accepted uploads, and MyHeritage stopped in 2025. Converted files are mainly useful for third-party analysis tools that expect a specific layout — the per-format notes above state what is publicly known.
What happens to no-calls?
They are preserved, in the target format's own notation: -- in 23andMe, MyHeritage and FamilyTreeDNA files, a pair of zeros in AncestryDNA files. A converter that drops them silently shrinks your file.
Why is the converted file slightly different in size?
Different formats spend different bytes on the same data: quotes, tabs versus commas, chromosome names versus numbers, and our provenance comment at the top. The data rows carry the same content.
Can it convert my file to a newer chip or add missing SNPs?
No, and be wary of tools that claim to: adding positions your chip never tested is imputation — statistical guessing — not conversion. This tool only rewrites the representation of what your file already contains.
Want to know what is actually in that file?
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