Oxygen O2 black filled icon
Chemical formula O2 with a bold ring letter O and small subscript numeral two
About the Oxygen O2 black filled icon
Rather than a tank or a mask, this design spells the oxygen formula itself: a heavy circular letter O with a thick counter, a small round dot at the upper right and a rounded numeral two dropped to the baseline as a subscript. It suits hospital and respiratory app interfaces, air quality dashboards, chemistry lesson slides, diving and fitness trackers, and gas cylinder labeling.
The letterform is geometric and near-monoline, with the subscript sized roughly half the O so the pairing stays balanced. It sits naturally beside CO2, H2O and other formula marks in the library. Because the counter of the O is narrow, render it at 20 px or more so the ring does not fill in.
This is the solid black filled version of the oxygen o2 icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.
Download it free as a scalable SVG vector or transparent-background PNG in seven sizes (16 to 512px), copy the SVG code straight into your project, or open it in the free online editor to change colors, apply gold, silver, neon and gradient styles, animate it, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
