dnalayer

Free browser tool

Raw DNA viewer and rsID lookup

Direct answer: Open an original consumer raw-DNA ZIP or text file and search up to 25 exact rsIDs locally. The viewer reproduces matching chromosome, position, and genotype fields without uploading the file, attaching health meaning, or treating a missing marker as biological absence.

Tool behavior and source documentation reviewed 26 August 2026

Runs in this browser

Open the file and find exact marker IDs

Choose the original ZIP, TXT, CSV, or TSV export. The viewer keeps the working copy in a dedicated browser worker until you clear it or leave this page. Maximum size: 64 MB.

or drop it here

No file byte, filename, query, or genotype is sent to DNA Layer.

What the viewer does

  • Reads supported 23andMe, AncestryDNA, MyHeritage, TellMeGen, and generic genotype tables
  • Opens the original ZIP without requiring a separate extraction step
  • Finds exact rsIDs or provider marker IDs and displays the matching row fields
  • Clears the in-memory working copy when you reset or leave the page

What it deliberately does not do

  • No gene, trait, ancestry, health, carrier, or medication interpretation
  • No call validation, strand flipping, phasing, imputation, or genome-build conversion
  • No inference that a missing marker or no-call means a variant is absent
  • No VCF, CRAM, BAM, PDF, screenshot, or family-tree GEDCOM support

How to look up a marker without uploading the file

  1. 01

    Use the original provider export

    Choose the ZIP or raw genotype table—not a PDF report, screenshot, ancestry-coordinate download, or spreadsheet you re-saved.

  2. 02

    Search exact identifiers

    Enter rsIDs such as rs123 or provider-specific IDs beginning with i. The viewer will not translate gene names or conditions into a hidden marker list.

  3. 03

    Read the row literally

    Chromosome, position, and genotype are copied from the selected file. They are not validated or converted and should not be compared across files without accounting for build and strand.

  4. 04

    Clear the working copy

    Use the clear button or leave the page. Either action terminates the worker holding the local file text.

The local-processing boundary

The browser passes the selected file to a dedicated worker. The worker keeps the decoded genotype table in memory for exact-ID searches and discards it when the worker terminates. The page does not persist it to browser storage, send it to a server, or include its filename, queries, genotypes, or results in analytics.

Ordinary site analytics may record that this page was viewed. If you later choose DNA Layer analysis, that is a separate, explicit workflow with its own documented data boundary.

A raw genotype is not a medical interpretation

Consumer files measure selected positions, and only a subset of raw calls may be individually validated. A displayed row can still involve file, build, strand, coverage, or evidence limitations. Do not diagnose, treat, change medication, or alter screening from this viewer. Consequential findings may require confirmation in an appropriate clinical laboratory.

Raw DNA viewer questions

Does this raw DNA viewer upload or store my file?

No. The selected file stays inside a dedicated browser worker until you clear it or leave the page. The viewer does not send the file, filename, marker queries, displayed genotypes, or results to DNA Layer or analytics. Ordinary site analytics may still record that the page was viewed.

Can I open the original 23andMe or AncestryDNA ZIP?

Yes. The viewer can read the original ZIP directly when the compressed file and candidate expanded genotype table are each within the 64 MB limit. TXT, CSV, and TSV genotype tables are also accepted.

Can I search a raw DNA file by gene or health condition?

No. This viewer accepts only exact rsIDs or provider marker IDs. It reproduces the matching chromosome, position, and genotype from the file without attaching a gene, trait, condition, medication, or risk interpretation.

Does a missing rsID mean I do not have that variant?

No. A marker can be absent because that provider or chip version did not test it, the row was omitted, or the position was a no-call. Missing from a consumer file is not evidence that a biological variant is absent.

Can I make a medical decision from a genotype shown here?

No. The viewer displays a raw file value without validating the call, strand, genome build, clinical relevance, or evidence. Consumer raw-data findings can be incomplete or false positive and consequential findings may require confirmation in an appropriate clinical laboratory.

File and interpretation sources

Need evidence context rather than a literal file row?

Review the supported analysis path