How to read your AncestryDNA raw data
Your AncestryDNA raw data is the full list of genetic markers AncestryDNA measured from your saliva. Because AncestryDNA's product is built around ancestry and family matching — not health — the raw file is the main way to explore health-relevant and trait markers from an AncestryDNA test. This guide explains exactly what's in the file, how to read it, what you can and can't learn from it, and how to analyze it without handing your genome to a stranger.
This is general educational information, not medical advice. Consumer DNA markers are statistical associations, not diagnoses — confirm anything serious with clinical-grade testing and a professional.
Why AncestryDNA raw data is worth reading
AncestryDNA reports focus on ethnicity estimates and DNA matches. Unlike 23andMe, it doesn't sell you health reports — so if you want to know what your AncestryDNA test says about traits, carrier status, or well-studied health markers, the raw data is your route. The same chip that placed you on a family tree also measured hundreds of thousands of genetic positions that interpretation tools can look up.
That's the opportunity and the catch: the markers are in your file, but AncestryDNA won't interpret them for you, and the tools that will often want you to upload your genome. There's a private way to do it, covered below.
How to download your AncestryDNA raw data
In your Ancestry account, go to your DNA settings, choose Download DNA Data, confirm with your password and an emailed verification link, and you'll receive a .zip file. For the full click-by-click walkthrough, see how to download your AncestryDNA raw data. Keep the downloaded file somewhere safe — it's your genome, and you only need to download it once.
What's inside the AncestryDNA raw data file
Unzip it and you'll find a tab-separated text file (typically AncestryDNA.txt). It opens in any text editor or spreadsheet. After a header preamble (comment lines describing the format and genome build), every line is one genetic marker with five columns:
| Column | What it is |
|---|---|
| rsID | The reference SNP ID, e.g. rs429358 — the universal name for that position |
| chromosome | Which chromosome the marker sits on (1–22, plus X, Y, MT) |
| position | The base-pair coordinate (AncestryDNA uses genome build GRCh37 / build 37) |
| allele1 | The base you inherited on one copy |
| allele2 | The base you inherited on the other copy |
The key format quirk: AncestryDNA splits your genotype into two allele columns (allele1 and allele2), whereas 23andMe puts the genotype in a single combined column. To get your genotype at a marker, you simply join the two letters — an A and a G mean a genotype of AG. Everything else works the same as any raw DNA file.
How to read a specific marker
Say you want to look up rs429358, one of the two markers behind the APOE story:
- Search the file for
rs429358(Ctrl/Cmd-F in a text editor, or the Find function in a spreadsheet). - Read across to the two allele columns and combine them — e.g.
TandT= TT. - Look up what that genotype means in a curated reference — but remember it's an association, not a diagnosis.
Doing this by hand for one marker is fine; doing it across the hundreds of thousands in your file is why people use a tool or an app. The same rsID-lookup approach powers our gene explainers — see, for example, what APOE4 in your raw data means or MTHFR in your raw data; the markers are read the same way from an AncestryDNA file.
What you can explore in your AncestryDNA raw data
Because the file is just rsIDs and genotypes, the same interpretation tools that work on 23andMe files generally work on AncestryDNA files. People commonly look up:
- Traits — caffeine metabolism, lactose tolerance, bitter-taste and other benign traits.
- Carrier status — single-gene variants you could pass on.
- Well-studied health-risk markers — associations across common conditions.
- Pharmacogenomics — how you may process certain medications (clinical-grade testing is the real standard here).
For a fuller picture of what's realistic to find — and what isn't — see what your raw DNA data reveals about health. The honest summary: raw data is a rich starting point for curiosity and lifestyle context, not a diagnostic tool.
Accuracy and limitations
Two limits matter most. First, a genotyping chip reads only about 600,000–700,000 positions out of roughly three billion base pairs — it samples common variation and skips most rare, disease-relevant variants, so a clean result is never an all-clear. Second, chips have known error rates: an individual health-risk marker can be a false positive. For anything serious — cancer-risk or neurodegenerative variants especially — confirm with clinical-grade testing and a certified genetic counselor before drawing conclusions.
Privacy: the safe way to analyze it
Most tools ask you to upload your AncestryDNA file to their servers. Your genome is a permanent identifier you can't change, and you share large stretches of it with your relatives — so uploading it partly exposes their data too, and hands your file to another company's policies and retention.
The safest approach is to analyze the file on your own device, where it never leaves your phone. That's the whole idea behind reading raw DNA without uploading it, and it's how Quanome analyzes your DNA on your phone. If you're weighing where a file is safest to send, our comparison of the most private way to handle 23andMe, Ancestry and MyHeritage data goes deeper.
The tools landscape
Options fall into three buckets: upload-based websites (broad features, but your genome goes to their servers), desktop tools (more private, more technical), and on-device apps (private by design). For a full rundown of interpretation services and what each is good for, see the best tools to interpret your raw data. You can also try our free DNA raw data explorer, which reads an AncestryDNA or 23andMe file entirely in your browser — nothing is uploaded.
Reading it responsibly
Your AncestryDNA raw data is genuinely interesting and genuinely limited. Treat findings as leads, not verdicts, keep the file private, and confirm anything that matters clinically. For the parent guide covering the whole raw-data landscape across providers, see 23andMe raw data: the complete guide, or browse the genetics section and the rest of the Quanome blog.
Read your AncestryDNA raw data, privately
Quanome imports your AncestryDNA or 23andMe file and parses it on your device — never uploaded — with health and trait insights and an AI coach. Free on the App Store and Google Play.
Quanome is free on the App Store and Google Play. Want product news too? Leave your email below.
Read and analyze your AncestryDNA raw data privately, on your device
Quanome imports your AncestryDNA, 23andMe, or whole-genome file and parses it locally on your phone — your raw DNA is never uploaded to us. You get health and trait insights alongside your labs and Apple Health data, with an AI coach that reasons across all of it on one private timeline. Learn more about Quanome →
Frequently asked questions
Does AncestryDNA show health information?
AncestryDNA's own product focuses on ancestry and family matching — it does not give you health reports the way 23andMe Health does. That's why your raw data matters: downloading the raw file and interpreting it yourself (or with a tool) is the main way to explore health-relevant and trait markers from an AncestryDNA test.
How do I read my AncestryDNA raw data file?
The download is a .zip containing a tab-separated text file (AncestryDNA.txt). After a header preamble, each line is one genetic marker with five columns: rsID, chromosome, position, and two allele columns. You can open it in a text editor or spreadsheet, but a lookup tool or an app is far easier than reading it by hand — you combine the two allele letters to get your genotype at each marker.
What's the difference between AncestryDNA and 23andMe raw data?
They're very similar tab-separated files with the same core information. The main format difference is that AncestryDNA splits your genotype into two separate allele columns, while 23andMe puts it in a single combined column. The chips also read slightly different sets of markers, so a variant present in one file may be absent from the other. Most interpretation tools accept both.
Is it free to analyze AncestryDNA raw data?
Downloading your own raw data from AncestryDNA is free. Some interpretation tools are free and others charge, and many require you to upload your file to their servers. You can also analyze it on-device with an app like Quanome, so you don't pay a site to process and store your genome.
Is it safe to upload my AncestryDNA raw data to a website?
Uploading your raw file exposes your genetic data to that company's privacy policy, security, and retention. Your genome is a permanent identifier you share with relatives, so the safest approach is to keep the file on your own device and analyze it locally, where it never leaves your phone.
How accurate is AncestryDNA raw data for health markers?
It's a genotyping chip, accurate enough for ancestry and many common traits, but it is not clinically validated. Chips have known error rates and individual health-risk markers can be false positives. Treat anything you find as educational, and confirm serious findings with clinical-grade testing and a healthcare professional.
Does the AncestryDNA file cover my whole genome?
No. The chip reads roughly 600,000–700,000 hand-picked positions out of about three billion base pairs — a tiny, curated sample. It captures common variation well but skips most rare and disease-relevant variants, so a 'normal' raw-data result is never an all-clear.
Quanome is live — free on iPhone and Android
Make sense of your DNA and health data privately. Download Quanome free on the App Store or Google Play.
Quanome is free on the App Store and Google Play. Want product news too? Leave your email below.