Choosing an icon set often starts with a simple question:
Do these icons look good?
That matters, but it is not enough.
An icon set can look excellent in a gallery and still become difficult to use once it enters a real product.
Before adopting one, test a small but representative group of icons and look at a few things that are easy to overlook.
1. Check Visual Consistency
Start with icons that have very different shapes:
- Home
- Search
- Settings
- User
- Folder
- Calendar
- Download
- Trash
Place them side by side at the size you will actually use.
Do they feel like they belong to the same system?
Look at:
- stroke weight
- corner treatment
- line caps
- proportions
- internal spacing
A good icon set should feel consistent even when the individual shapes are very different.
2. Compare Optical Size
Two icons can both use a 24 × 24 viewBox and still look very different in a toolbar.
A circle may fill most of the available space, while an arrow may leave much more empty space.
So don't only ask:
Are they technically the same size?
Ask:
Do they feel equally important when placed next to each other?
Testing 10–15 icons in a real toolbar is often more useful than browsing hundreds of them in a gallery.
3. Test Them at Real UI Sizes
Large previews can hide problems.
If your interface uses icons at 16, 20 or 24 pixels, test them at those sizes.
Look for:
- strokes merging
- details disappearing
- narrow gaps becoming unclear
- some icons appearing heavier than others
An icon can look beautiful at 200 pixels and perform poorly at 16 pixels.
4. Inspect the SVG Structure
Visual quality is only part of the story.
Open a few SVG files and look at the markup.
Some assets are simple and easy to understand. Others may contain:
- unnecessary paths
- nested groups
- redundant transforms
- excessive decimal precision
- inline styles everywhere
This may not matter for one icon.
But it can matter a lot when hundreds of icons need to be recolored, resized, edited or processed automatically.
A good SVG should not only look right. It should also remain easy to work with.
5. Try Editing a Few Icons
Make a few simple changes:
- change the color
- change the stroke width
- resize the icon
- modify one element
If a small change becomes unexpectedly difficult, that is useful information.
Icons increasingly move through more than one tool or workflow: design software, code, build systems, design tokens and automated asset pipelines.
Editability matters.
6. Check the Metaphors
A visually consistent icon is still a poor choice if users cannot understand it.
Pay particular attention to actions such as:
- upload
- download
- share
- export
- archive
- sync
- delete
Ask someone unfamiliar with the icon set to identify a few of them without labels.
That simple test can reveal whether the visual language is actually understandable or merely attractive.
7. Verify the License and Maintenance
Before integrating a library deeply into a product, check:
- commercial use
- modification rights
- attribution requirements
- redistribution rules
- project activity
- versioning
- maintenance
Icon libraries can become long-term dependencies.
The license and the way the project is maintained matter almost as much as the artwork.
A Simple Final Test
Build a small mock interface using only the candidate icon set.
Include:
- a toolbar
- navigation
- a few buttons
- disabled actions
- status indicators
Then evaluate the interface rather than the individual icons.
Ask:
- Does anything feel too heavy?
- Are some icons visually smaller?
- Are the metaphors clear?
- Does the set still feel coherent?
- Does it work at small sizes?
This usually tells you more than scrolling through the library itself.
The Better Question
Instead of asking:
Do I like these icons?
Ask:
Will these icons still work as a coherent system after hundreds of them have been used, edited and maintained inside the product?
That is usually the more useful test.
The best icon set is not necessarily the one with the most icons or the most impressive gallery.
It is the one that remains consistent, understandable and workable as your product grows.
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