Octagon black filled icon
Regular eight-sided octagon drawn as a thick outline with an empty center
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About the Octagon black filled icon
A single regular octagon is drawn in a thick even outline, its eight equal sides meeting at slightly softened corners around a completely empty interior. The blank center makes it a container as much as a shape, so it suits stop and warning signage, geometry and math teaching material, badge or achievement frames, flowchart and diagram building blocks, and placeholder shapes in wireframes.
The figure fills the canvas almost edge to edge with uniform stroke weight and no fill, keeping the eight-sided silhouette immediately readable. It pairs with hexagon, pentagon and triangle icons from the same geometry set. Drop a number or glyph inside it to turn the shape into a labeled marker.
This is the solid black filled version of the octagon 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.
