What this style means
Bold icons are heavy-weight icons with thickened strokes or filled mass for maximum emphasis. IconStash classifies icons by style across all 28 indexed libraries, so you can hold the weight constant and compare how different design teams solve the same icon.
When to use them. Bold icons work at large sizes and in marketing layouts where a regular-weight icon looks weak. They lose definition below about 20px, so avoid them in compact controls.
Every icon below links to a page with the full SVG source, a live preview you can recolour and resize, PNG export at six sizes, and a ready-to-paste React snippet.
What are bold icons?
Bold icons are heavy-weight icons with thickened strokes or filled mass for maximum emphasis. IconStash indexes 26,578 of them across 27 open-source libraries, so you can compare the same drawing style as interpreted by different design teams.
When should I use bold icons?
Bold icons work at large sizes and in marketing layouts where a regular-weight icon looks weak. They lose definition below about 20px, so avoid them in compact controls.
Which libraries include bold icons?
On IconStash the strongest coverage comes from Fluent UI Icons (9,461), Phosphor Icons (3,067), Solar Icons (2,422). Open any library hub to see its full style range alongside install instructions.
Can I export bold icons as PNG?
Yes. Every icon on IconStash exports to PNG at 16, 32, 64, 128, 256, or 512 pixels, generated in the browser from the original vector so it stays crisp at any size. You can also copy the raw SVG, export a React component, or build an SVG sprite.
Are these bold icons free for commercial use?
The libraries indexed here are MIT, Apache 2.0, CC BY 4.0, or CC0 licensed, all of which permit commercial use. CC BY sets such as Solar Icons require attribution — check the license shown on each icon page if you cannot provide credit.