DNA black outline icon
Outline DNA double helix strand with four horizontal base-pair rungs between twisting strands
About the DNA black outline icon
Two curved strands twist around a shared vertical axis and cross at three points, with four straight rungs drawn as base-pair connectors inside the widest loops. The upright ladder shape reads instantly as genetics, heredity, molecular biology and DNA testing. Use it in lab and biotech websites, genealogy or ancestry apps, medical research dashboards, health-science presentations and pharmaceutical packaging where a scientific mark is needed.
The helix is taller than it is wide, with even spacing between crossings so the rungs stay legible when scaled down. Line weight matches other science icons such as microscope, test tube and molecule, making it easy to build a matching set. At 16-20 px, drop to two rungs or use the filled style to avoid the strands merging.
This is the black outline version of the dna icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
It downloads free as an SVG vector or transparent PNG in seven sizes, and the free online editor lets you recolor it, apply gold, silver, neon and gradient styles, add animation, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
