// test how svg icons render at every size
Preview SVG icons at common UI sizes (16–512px) and on multiple background colors. Test contrast, visibility, and rendering instantly in your browser.
Ready to preview
Paste SVG and click Preview IconPaste raw <svg> markup into the input. Supports any valid SVG including icons from Heroicons, Lucide, Feather, etc.
Select render mode (Inline or <img> tag), set an icon color, and pick background presets to test against.
Click Preview Icon to see all sizes at once. Export as PNG at any dimension or copy the optimized SVG code.
SVG Icon Previewer lets you paste any SVG and instantly see how it renders across all common UI sizes — from tiny 16px favicons up to large 512px hero icons. It's especially useful for catching rendering issues that only appear at small sizes, like disappearing strokes or blurry details.
Any valid SVG markup is supported — including icons from Heroicons, Lucide, Feather, Bootstrap Icons, Font Awesome SVGs, Material Icons, Tabler Icons, and custom hand-crafted SVGs. The tool strips potentially dangerous attributes like onclick and <script> blocks for safety.
Inline SVG inserts the SVG code directly into the DOM, meaning it inherits CSS currentColor and can be targeted by CSS rules. The <img> tag mode renders it as an opaque image — it won't respond to CSS color overrides. Both modes are useful in different deployment scenarios.
SVG icons with thin strokes (e.g. stroke-width: 1) or intricate details often look blurry at 16px or 20px because sub-pixel rendering can't resolve fine lines. Consider using a bolder stroke or a simplified version of the icon for small sizes.
The tool does NOT modify your SVG for preview purposes. The color override works by wrapping inline SVGs in a container with CSS color set — it only affects icons that use currentColor. Your original code is never permanently altered unless you explicitly copy the processed output.
Yes. Use the PNG export button and select the desired pixel size from the dropdown (16px to 512px). The tool renders the SVG to an HTML5 Canvas element and exports a PNG download. All processing is done in your browser — nothing is sent to a server.
Some SVGs with external resources or complex filters may not render correctly to Canvas due to browser security restrictions (CORS). Try inlining any referenced assets or simplifying the SVG. Also, SVGs without explicit width/height or viewBox attributes may not export correctly — add those attributes first.
The grid shows 12 common UI sizes: 16, 20, 24, 28, 32, 40, 48, 64, 80, 96, 128, and 256 pixels. These cover everything from favicons and toolbar icons to large hero graphics and social media assets. Each tile is labeled with its exact pixel size.
No. This tool is 100% browser-based. Your SVG code is processed entirely in JavaScript on your own device and never leaves your browser. There are no server uploads, no data logging, and no third-party API calls for the core preview functionality.
An SVG Icon Previewer is a browser-based tool that lets designers and developers instantly visualize how a Scalable Vector Graphic (SVG) icon renders across different pixel sizes and background contexts. Unlike raster image formats like PNG or JPEG, SVG files are resolution-independent — but that doesn't mean they look great at every size. Details that are clearly visible at 96px can become unrecognizable at 16px, and a carefully crafted icon might fail to convey its meaning when used as a favicon or toolbar button.
This tool solves that problem by rendering your SVG simultaneously at 12 standard UI sizes, from 16×16 (favicon territory) all the way up to 256×256 (large feature icons). You can immediately spot problems like collapsing stroke widths, overlapping paths, or disappearing fine details — before you ship to production.
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SVG icons power modern interfaces — from navigation bars and button icons to loading spinners and hero illustrations. The same SVG file is often used across multiple sizes in a single application. A hamburger menu icon might appear at 24px in the mobile nav but at 48px on a landing page hero. A social share icon might be 20px inline but 96px on a dedicated share modal.
Without a previewer, developers typically have to drop icons into their actual codebase, resize manually with CSS, and check each context individually. This is slow and error-prone. SVG Icon Previewer collapses this workflow into a single screen — paste once, see everything at once.
When deploying SVG icons in HTML, you have two primary rendering methods, each with distinct behavior:
Inline SVG means pasting the raw <svg> markup directly into your HTML. This approach allows full CSS control, including inheriting currentColor for easy theming. You can target specific paths with CSS selectors, animate them with CSS keyframes, and adjust them dynamically with JavaScript. The downside is increased HTML payload size and more complex templating.
The <img> tag method references the SVG as an external file. It renders as a static, opaque image — CSS color properties won't affect internal SVG attributes like fill or stroke. This is simpler to use and better for caching, but loses the interactivity and CSS theming advantages of inline SVG.
SVG Icon Previewer lets you toggle between both modes, so you can verify that your icon looks correct regardless of how it will ultimately be deployed.
One of the most powerful features of inline SVG is the currentColor CSS value. When an SVG's fill or stroke is set to currentColor, it inherits the text color from the surrounding element. This makes it trivially easy to have icons that automatically match light/dark modes, button colors, or text colors — just set the CSS color property on the parent and the icon adapts.
Most modern icon libraries (Heroicons, Lucide, Feather, Tabler Icons) use this pattern by default. The color picker in this tool sets color on the preview wrapper, letting you test how your icon looks in any color context.
Testing icons at small sizes consistently reveals issues that aren't visible at larger preview sizes:
Stroke width collapse: An icon designed with 1.5px strokes looks elegant at 48px but the strokes may nearly disappear at 16px due to sub-pixel rendering. Icons intended for small sizes should use stroke widths of at least 2px.
Path complexity: Detailed, intricate icons (logos, maps, complex illustrations) become unreadable at small sizes. Consider creating simplified versions specifically for small use cases — many icon sets include both detailed and simplified variants for exactly this reason.
viewBox mismatch: If an SVG lacks a proper viewBox attribute, browsers may render it at a fixed internal size that doesn't scale correctly. Always ensure your SVG has both a viewBox and either explicit width/height or relies purely on viewBox scaling.
Missing xmlns: SVGs used in <img> tags must include xmlns="http://www.w3.org/2000/svg" in the root element. Without it, some browsers may refuse to render the image.
A great icon on a dark background can be nearly invisible on a white background if it uses dark stroke colors. Background contrast testing is a critical but often skipped step in icon QA. This tool provides preset backgrounds covering the most common UI contexts: dark (#0e0e0e), light (#ffffff), slate, navy, and vibrant accent colors. You can also set a fully custom background using the color picker.
For accessibility compliance (WCAG 2.1), informational icons need at minimum a 3:1 contrast ratio between the icon and its background. Use the background presets to quickly verify that your icon maintains sufficient contrast across the contexts where it will appear.
While SVG is generally preferable for web use, there are many situations where PNG exports are needed: documentation, README files, App Store submissions, email templates, Figma assets, and legacy applications that don't support SVG. The PNG export feature in this tool uses the HTML5 Canvas API to rasterize your SVG at any size from 16px to 512px, then downloads a PNG file directly to your browser.
Note that very complex SVGs with CSS animations, external fonts, or cross-origin resources may not export correctly via Canvas due to browser security restrictions. For complex use cases, server-side tools like Inkscape, ImageMagick, or Puppeteer offer more reliable rasterization.
The modern web ecosystem has a rich selection of open-source SVG icon libraries. Heroicons (by the Tailwind CSS team) provides clean, consistent icons in both outline and solid styles. Lucide is a community fork of Feather Icons with an extensive and growing set. Tabler Icons offers over 4,000 pixel-perfect icons under the MIT license. Bootstrap Icons is a comprehensive set maintained by the Bootstrap team. Phosphor Icons offers six weights from thin to fill. All of these work seamlessly with this SVG Icon Previewer.