DNA Viewer 3D

Paste a sequence — the double helix builds itself, color-coded by base.

Linear DNA Map

Annotated 2D map — find motifs, see codon translation, mark restriction-enzyme cuts.

View:
Enzymes

Shares the sequence with the 3D Helix view. Use the Search tab in the Workbench to highlight a motif here too. Rendering by seqviz (MIT).

Frequently asked

Paste any DNA sequence (A, T, G, C — multiple sequences on separate lines for comparison) into the input box. The viewer renders a rotating, color-coded 3D double helix immediately. Free, runs entirely in your browser, no signup, no installation. Click any base pair to see its biology in the side panel, or use the Linear View tab for an annotated 2D map.
The Workbench → Stats tab translates each sequence into its 5′→3′ amino-acid sequence using the standard genetic code, with stop codons shown as *. The Linear View also overlays a codon-by-codon protein strip directly under the sequence. Open reading frames are auto-detected — any ATG followed by 20+ codons before a stop codon shows up as a pink ‘ORF’ annotation band.
Switch to the Linear View tab and click the ‘Enzymes’ dropdown. Tick any of 12 common restriction enzymes (EcoRI, BamHI, HindIII, NotI, XhoI, SalI, PstI, NdeI, KpnI, SacI, SmaI, XbaI) — cut-site markers appear inline on the sequence. The 3D Helix tab also highlights the same positions if you type the recognition site (e.g., GAATTC for EcoRI) into the Workbench Search box.
Paste each sequence on its own line. The viewer renders them as side-by-side 3D helices (Studio tab) and as concentric rings (Linear View, Circular or Both mode). For equal-length sequences, the Compare tab highlights every position that differs — perfect for visualizing point mutations like wild-type vs. mutant. Try the built-in Pair (WT/mut) or Trio presets to see this immediately.
Yes — for visualization, codon translation, reverse complement, GC%, Tm, restriction-enzyme cut-site finding, motif/pattern search, ORF detection, and side-by-side sequence comparison, this tool is fully free and browser-based with no signup or account. Built for students learning DNA structure, teachers preparing visual aids, and researchers doing quick sequence checks. The 3D helix view in particular isn't offered by most commercial sequence editors. Accepts FASTA from NCBI/Ensembl including IUPAC ambiguity codes (N, R, Y, S, W, K, M, B, D, H, V) and RNA (U).