You have a set of icons, a hero illustration, and a small loading animation to put into an app or a website, and the designer has sent each one in three formats. Which one do you use? The short version of SVG vs PNG vs Lottie is simple: SVG works best for icons and flat illustrations, PNG is useful for images with transparency, textures, and soft shadows, and Lottie is ideal for animations that need to stay small and scale cleanly. The rest of this guide explains why each format works, where its limitations appear, and how to choose the right option for different projects.
What Are SVG, PNG, and Lottie Formats?
Understanding the differences between these formats makes it easier to choose the right one for a particular graphic. Before comparing SVG vs PNG vs Lottie in real-world scenarios, it helps to understand how each format works.
What Is SVG?
SVG is a text-based vector graphics format. Open an SVG file in a code editor, and you will see XML that describes shapes, such as a circle at specific coordinates or a path with particular curve points, filled with a certain color. The browser or app draws these shapes at render time.
Because SVG does not store artwork as a fixed grid of pixels, it can display the same graphic clearly at 16 px and 1,600 px. This makes SVG particularly useful for responsive interfaces, icons, logos, and flat illustrations.
What Is PNG?
PNG is a raster image format made up of pixels, placing it on the raster side of the raster vs vector distinction. Each pixel stores color information and an alpha value, which allows PNG to support transparency.
PNG uses lossless compression, so repeatedly saving an image does not introduce the quality loss associated with lossy formats like JPEG, as long as the image is not otherwise altered. However, the pixel grid has fixed dimensions. A 64 px PNG icon stretched to 128 px can appear blurry.
What Is Lottie?
Lottie is an animation format that uses JSON to describe animation elements, including layers, shapes, keyframes, and easing. Animators commonly export Lottie files from After Effects using the Bodymovin plugin. A compatible player then renders the animation in browsers with tools such as lottie-web, and in iOS, Android, Flutter, and React with lottie-ios, lottie-android, and React wrappers.
Think of Lottie as vector-style artwork with a timeline. The player reconstructs the animation from its instructions, so shape-based animations stay sharp at different sizes. A Lottie file can also be much smaller than an equivalent GIF, though the final size depends on the animation’s complexity and assets.
SVG vs PNG vs Lottie: A Worked Example With a 24 px Icon
Consider a simple bell icon used for a notifications button. Comparing SVG vs PNG vs Lottie for this everyday interface element shows when each format makes sense.
As SVG, the file is one path element and a viewBox, usually under 1 KB. You can change its color with CSS (fill: currentColor), so one file serves light mode, dark mode, and the hover state. At 2x and 3x screens, it stays sharp with no extra assets.
As PNG, you need the icon at 24, 48, and 72 px to cover standard, 2x, and 3x displays, so three files. Each is a few KB. To change the color, you re-export from the design tool. If a designer later tweaks the stroke weight, all three files get replaced.
As Lottie, this makes no sense unless the bell rings. If it does ring when a notification arrives, a Lottie file of that one-second shake is typically 5 to 15 KB and plays at any size. The same animation exported from After Effects as a GIF would be several hundred KB and would look blurry on a retina screen.
The rule that falls out of this: a static shape with flat color is an SVG job. A pixel-based image is a PNG job. Motion built from shapes is a Lottie job.
Where SVG Stops Being the Right Choice?
SVG files get heavy when the artwork is complex. A detailed illustration with hundreds of paths, gradients, and masks can run to 300 KB or more of XML, and the browser has to parse and draw every path on each render. Past a certain point, a PNG or WebP export of that same illustration is both smaller and faster to paint.
A rough threshold used in practice: if the SVG is over 100 KB or has more than a few hundred paths, test the raster version. Measure, do not guess. Chrome DevTools’ Performance panel shows paint time for both.
Two more SVG problems people hit:
- Exported SVGs from Figma or Illustrator often contain editor metadata, unused definitions, and embedded fonts. Run them through SVGO before shipping. It is common for a 40 KB export to drop to 8 KB with no visible change.
- Text inside an SVG uses the font on the viewer’s machine. If the font is not installed, the text falls back to something else. Convert text to outlines before export, or expect layout surprises.
Where PNG Still Wins in the SVG vs PNG vs Lottie Comparison?
PNG remains useful when a graphic depends on pixel-level detail rather than scalable vector shapes.
Raster formats usually represent photographs, painted textures, and many 3D renders better. PNG is especially useful when transparency and lossless image quality are important.
PNG also works well for images with soft drop shadows, blurs, and glow effects. Although SVG supports filters, complex filters can increase rendering costs and may behave differently across environments. A raster image with the effect already applied can render more predictably.
However, PNG files can become large at high resolutions. A full-width hero image exported at 2x resolution might reach 500 KB to 1 MB. If transparency is not needed, JPEG or WebP often compresses better.
The key takeaway from SVG vs PNG vs Lottie is that PNG should not be the default for every image. Choose it when transparency, lossless detail, or compatibility with a particular image workflow matters. For many web photographs, WebP or AVIF may be a better option.
When Lottie Is the Right Choice, and When It Is Not?
Lottie makes sense when the animation is built from vector shapes: loaders, success checkmarks, onboarding illustrations, empty-state characters, animated icons on tab bars. If you do not have an animator yet, free libraries such as Creative Stall have ready-made Lottie files for most of these, which is enough to wire up the player and test performance before custom artwork arrives. These files are small, they scale, and you can change colors and speed at runtime through the player API.
Lottie does not make sense for:
- Video or anything with photographic frames. Lottie can embed raster images, but then you lose the size benefit and might as well use MP4.
- Very complex After Effects work. Not every effect exports. Expressions, some mask modes, and most third-party plugins are unsupported. A common sign of trouble is an animation that plays correctly in After Effects but shows missing layers in the browser. Check the Bodymovin supported-features list before the animator builds something you cannot ship.
- Pages where JavaScript must stay minimal. lottie-web is around 60 KB gzipped for the full build. The light build is smaller, and dotLottie players are even smaller, but they are still a dependency. For one small animation on a static landing page, a CSS animation on an inline SVG might be the better trade.
SVG vs PNG vs Lottie: Quick Comparison
| Format | Best for | Scales without blur | Transparency | Animation | Typical size for an icon |
| SVG | Icons, logos, flat illustrations | Yes | Yes | CSS or SMIL, limited | Under 2 KB |
| PNG | Photos, textures, baked shadows | No | Yes | No | 3 to 10 KB per resolution |
| Lottie | Shape-based motion, loaders, onboarding | Yes | Yes | Yes, full timeline | 5 to 50 KB |
Mixing SVG, PNG, and Lottie in One Project
Most production apps and websites use a combination of formats rather than choosing just one. A typical setup for web and app graphics might look like this:
- Icons and logos: Use SVG, either inline or through an SVG sprite, when styling and responsive scaling are important.
- Marketing and product photography: Prefer WebP or another suitable photographic format, using PNG when transparency or lossless detail is required.
- Loaders, empty states, and onboarding animations: Use Lottie where vector-based motion adds value, and lazy-load the player when appropriate to avoid delaying the initial page render.
If a project does not yet have a design team producing custom assets, free icon and illustration libraries can help developers prototype the graphics pipeline. This gives you a chance to test SVG optimization, PNG resolution variants, and Lottie player integration before the final artwork arrives.
A balanced approach to SVG vs PNG vs Lottie helps teams maintain visual quality without adding unnecessary file sizes, dependencies, or asset-management work.
Common SVG vs PNG vs Lottie Mistakes and How to Fix Them
Your SVG icon looks blurry. It was exported as a PNG with an .svg extension, or it embeds a raster image. Open the file in a text editor. If you see a long base64 string, that is the embedded bitmap.
Your Lottie animation plays in the preview tool but not in the app. Usually an unsupported After Effects feature. Open the JSON and look for layers with ty: 2 (image layers) or expressions in the keyframes. Ask the animator to rebuild those parts with plain shape layers.
Your page is slow, and the profiler blames paint time. Count the SVGs on the page and their path counts. Twenty detailed illustrations inlined as SVG will hurt. Rasterize the large ones; keep the icons as SVG.
Your PNG icons look sharp on your laptop and soft on a phone. You shipped only the 1x size. Add 2x and 3x versions, or switch the icon to SVG and stop maintaining three files.
Final Thoughts
The best format depends on the graphic’s content, behavior, and implementation requirements.
- Choose SVG for scalable icons, logos, and flat illustrations that need to stay sharp across screen sizes.
- Choose PNG when you need transparency, lossless raster detail, or predictable rendering of baked visual effects. Consider WebP, JPEG, or AVIF for suitable photographic images.
- Choose Lottie for lightweight, scalable animations built from supported vector shapes, especially loaders, animated icons, and onboarding graphics.
Ultimately, the SVG vs PNG vs Lottie decision is not about finding one universally superior format. It is about matching each asset to its purpose. Combining the three thoughtfully can improve visual consistency, keep pages responsive, and make graphics easier to maintain across apps and websites.
Recommended Articles
We hope this guide helps you understand how SVG, PNG, and Lottie formats can improve visual quality and performance across apps and websites. Explore our recommended articles for more insights on web graphics, image optimization, vector illustrations, animation tools, and front-end development.
