PNG vs SVG - when to use each format
Editorial team ·
PNG stores pixels; SVG stores drawing instructions. Choose PNG for photos and anything with per-pixel detail, and SVG for logos, icons, and diagrams that must stay sharp at every size. The right pick depends on scalability, file size, and the target platform - this guide covers both formats' strengths, and our converters let you switch in either direction.
How each format actually works
PNG (Portable Network Graphics) is a raster format. A PNG file stores a grid of coloured pixels - every pixel has an explicit red, green, blue, and alpha value. When your browser or image viewer opens a PNG, it reads those pixel values out of the file and paints them to the screen at their native resolution. Making a PNG larger on screen stretches each pixel, which produces the familiar blurry upscale. Shrinking a PNG re-samples the grid; depending on the algorithm, edges can soften.
SVG (Scalable Vector Graphics) is a vector format. An SVG file is an XML document describing shapes, lines, curves, and fills. There are no pixels in the source - just instructions like "draw a circle at (20,20) with radius 15, filled red". When the browser renders the SVG, it calculates the pixels on the fly at whatever resolution the display requires. The same SVG file renders crisp at 16×16 for a favicon and at 3000×3000 for a billboard banner, with no quality loss.
Side-by-side comparison
Side-by-side comparison on PNG vs SVG when to use: PNG stores a pixel grid; SVG stores shapes and text as vectors that stay sharp at any zoom.
| Attribute | PNG | SVG |
|---|---|---|
| Encoding | Pixel grid (raster) | Drawing instructions (vector) |
| Scalability | Loses quality when upscaled | Infinite, lossless |
| File size (simple logo) | ~20-80 KB | ~2-8 KB |
| File size (complex illustration) | Moderate (~150 KB) | Can balloon (~500 KB+) |
| File size (photograph) | Large (~1-3 MB) | Not suitable |
| Transparency | Yes (alpha channel) | Yes (per-shape opacity) |
| Animation | Via APNG (limited support) | SMIL + CSS (broad support) |
| Browser support | Universal | IE9+, all modern browsers |
| Editable in text editor | No | Yes (it's XML) |
| CSS styling at runtime | No | Yes (colors, strokes, filters) |
When PNG wins
When PNG wins on PNG vs SVG: photos, screenshots, and soft gradients need pixels - SVG would balloon or look fake if you force a photo into paths.
Complex illustrations with lots of gradients, shadows, and pixel-level detail. If your icon looks like a tiny painting - soft drop shadows, multi-stop gradients, texture overlays - a PNG of the flattened final render is often smaller than the SVG with the equivalent filters.
Screenshots of UI, text, or code. Screenshots are inherently pixel data. PNG preserves the exact sharpness of rendered text and UI chrome without lossy compression artefacts. Prefer lossless WebP for file-size savings if your audience uses modern browsers.
When the target platform doesn't support SVG. Some document formats (Word documents, some email clients, older PowerPoint) still render SVG inconsistently. If the final destination can't promise SVG support, export the SVG to PNG at target resolution first.
When SVG wins
When SVG wins on PNG vs SVG: logos, icons, and simple diagrams stay crisp on retina and tiny in bytes when the artwork is truly vector.
Icons in a UI. SVG icons can be styled with CSS (fill, stroke, opacity, filter) and animated on hover/focus. The same icon inherits the current text colour by setting fill: currentColor. PNG icons require separate files per colour variant.
Charts, diagrams, and infographics. Anything drawn from shapes and text - org charts, architecture diagrams, flowcharts, statistical plots - renders cleanly in SVG and stays sharp at any zoom level. Zooming into a PNG diagram quickly reveals aliasing.
Animated UI elements. SVG animation via SMIL, CSS transitions, or JavaScript scales better than APNG or animated GIF for geometric shapes (loading spinners, state indicators, micro-interactions). File sizes remain small even for complex animations.
The four real decisions in everyday work
The four real decisions in everyday work for PNG vs SVG are brand mark, UI icon, photo hero, and chart - pick SVG for the first two when clean, PNG or WebP for the photo, and SVG or canvas for charts.
Product photo. → PNG if transparency matters (cut-out on white or a patterned background); otherwise JPG or WebP for half the file size. Never SVG.
Diagram or chart in documentation. → SVG embedded in the HTML (so it's zoomable, accessible via text inside the SVG, and sharable as a single file). Export to PNG only when the target is a PDF or Word doc that doesn't respect SVG fidelity.
Conversion paths between PNG and SVG
PNG → SVG is a "tracing" operation. The target format needs shape definitions, so a tracer analyzes edges and colour regions in the PNG and generates approximated vector paths. Results are excellent for logos and simple icons (clean edges, few colours) and poor for photos (too many colour regions to trace meaningfully). Use PNG to SVG - tune the smoothing parameter, preview, and iterate until the traced paths match the original.
SVG → PNG is a "rasterising" operation. The browser (or a converter) evaluates the SVG instructions at a specified resolution and writes pixel values. Use SVG to PNG - pick the output size before export; unlike the other direction, rasterising is lossless for the target size but means you commit to a single resolution.
Round-trip conversions (SVG → PNG → SVG) compound loss in the PNG stage and the subsequent trace. Keep the SVG master source and export PNG flavours as needed; never go in the other direction unless you have no SVG source to work from.
Related tools
- PNG to SVG Converter - trace a raster image into a scalable vector.
- SVG to PNG Converter - rasterise a vector to PNG or WebP at any size.
- Compress JPEG - reduce a photo's file size with AI-tuned quality.
- Resize Image - set exact pixel dimensions with bicubic interpolation.
Related guides
- PNG to SVG: when to vectorize a raster image - which logos and icons trace cleanly and which do not.
- SVG to PNG: when to rasterize an SVG - choosing the right export resolution and when rasterising makes sense.
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