“Timeless design is so hard to achieve, but we’ve been using Streamline icons for 8 years now and they haven’t aged a day. An instant classic.”
Bold, single-color flat icon sets
- 4 flat styles: Core, Flex, Sharp, and Plump
- Solid single-color shapes, no gradients or outlines
- Recolor to your brand in one click with SVG
One flat fill, no linework
Use flat icon sets in three easy steps
Pick a flat set
Choose Core Flat, Flex Flat, Sharp Flat, or Plump Flat depending on how rounded or geometric you want the shapes.
Export as SVG or PNG
SVG keeps the fill editable to match your brand color. PNG is ready to drop in as-is.
Drop into your project
Works in Figma, Webflow, slide decks, or any tool that accepts SVG or PNG.
Core Flat icon set
The Helvetica of icons. Solid single-color fill on a neutral 14px grid.
Core Flat
Where Core Flat icons get used
Dashboards and dense UI
One solid color per icon keeps a busy interface calm. No gradients or strokes competing with the data around them.
Sidebar navigation and toolbars
Core Flat stays neutral and compact, built to disappear into the interface and let the content lead.
Flex Flat icon set
Smooth organic curves, filled solid. Approachable without going fully playful.
Flex Flat
Where Flex Flat icons get used
Social graphics and slide decks
A single flat color reproduces perfectly on any background, screen, or printer, no anti-aliasing artifacts.
Product and lifestyle contexts
Flex Flat’s soft, organic shapes feel natural alongside photography and lifestyle imagery.
Sharp Flat icon set
Pure geometry, no curves, filled solid. Bold and high-contrast.
Sharp Flat
Where Sharp Flat icons get used
Posters and bold editorial layouts
Flat shapes hold up at large sizes and in print, where fine linework or gradients would get lost or muddy.
Wayfinding and technical systems
Sharp Flat’s hard angles carry a strong, technical identity in signage and large-format print.
Plump Flat icon set
Chunky, rounded, cartoon-inspired shapes, filled solid.
Plump Flat
Where Plump Flat icons get used
Friendly, approachable products
Plump Flat rounds every shape for a warmer feel, ideal for onboarding, education, and consumer apps.
Worksheets and Etsy-style graphics
Chunky rounded shapes that feel instantly approachable, popular for teacher worksheets and product graphics.
Streamline icons are the secret tool behind 50,000 product teams
“Happy to work with such a great resource like Streamline icons. Makes it so easy to use icons in Figma!”
“I use Streamline icons for all my projects. Me and my clients love them. They’re so versatile and there are soooo many to choose from. I highly recommend them for any type of web, app, design or illustration project”
Get more PNG icons with Pro
Free sets cover thousands of icons. Pro unlocks the full library across every family.
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- 109,582 icons
- Mandatory attribution
- All plugins, web app, MCP and API (limited)
- Adjust size, color and format
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per month
- 333,032 pro icons on top
- Full resolution PNG exports
- 58 pro sets in 11 families
- All plugins, web app, MCP and API
- Pay monthly or yearly
One-time purchase
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- Buy once, own forever
- Future assets included
- All source files as a ZIP
- All plugins, web app, MCP and API
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What makes an icon “flat”
A flat icon is a solid, single-color shape with no outline, no gradient, and no shadow. That restraint is the point: flat icons stay legible at any size, reproduce cleanly on any background, and never fight for attention with the content around them.
Streamline draws flat as one of the core style variants across four families, so you get the same icon concept in a consistent flat treatment no matter which family fits your brand.
Four flat styles, one grid each
Core Flat is neutral and compact, built for interface work. Flex Flat softens every corner for a friendlier feel. Sharp Flat keeps hard angles for a bold, technical look. Plump Flat goes further, chunky and rounded for playful, approachable projects.
Every flat set is drawn by the same team on the same underlying grid as its Line and Duo counterparts, so switching between styles later never means rebuilding your icon system from scratch.
Frequently asked questions
Quick answers to common questions about 16px icons.
What is a flat icon?
A flat icon is a solid shape filled with a single color, with no outline, gradient, or shadow. The style favors clean, minimal shapes that stay legible at any size and reproduce reliably across screens and print.
Where can I download flat icon sets?
Visit streamlinehq.com/icons and filter by style to browse Core Flat, Flex Flat, Sharp Flat, and Plump Flat. Download as SVG to keep the fill color editable, or PNG for a ready-to-use image.
Are these flat icon sets free?
Yes. Every flat family has a free tier of 499 to 998 icons as SVG and PNG, no card required. Pro unlocks the full library of 5,600+ icons per style.
Which flat style should I use?
Core Flat is the safest default for interface and product work. Flex Flat suits friendlier, lifestyle-adjacent brands. Sharp Flat fits bold, technical, or editorial contexts. Plump Flat works best for playful, education, or Etsy-style graphics.