Image Formats: WebP, PNG, JPG & SVG Compared
Picking the wrong image format can bloat page load times or blur your graphics. Here is how modern web formats compare in compression, transparency, and crispness.
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Format Comparison & Technical Specifications
| Output Format | MIME Type | Specification | Type |
|---|---|---|---|
| PNG Image | image/png | W3C-PNG | Portable Network Graphics |
| JPG JPEG Image | image/jpeg | ITU-T-T81-JPEG | Joint Photographic Experts Group |
| WebP Image | image/webp | RFC-6386-VP8 | Google WebP Modern Image Format |
| SVG Vector | image/svg+xml | W3C-SVG | Scalable Vector Graphics |
| HEIC Photo | image/heic | ISO-IEC-23008-12-HEIF | High Efficiency Image Container |
| AVIF Image | image/avif | AOMEDIA-AV1-AVIF | AV1 Image File Format |
Technical Specifications & Codec Breakdown
The Quick Format Decision Rule
Use WebP or AVIF for modern websites (30% smaller than JPEG with transparency support). Use JPG for photos where tiny imperceptible compression artifacts don't matter. Use PNG for screenshots, UI graphics, and illustrations requiring crisp pixel-sharp text. Use SVG for logos and icons that need infinite scaling.
Raster vs. Vector: Why SVGs Never Blur
Raster images (JPG, PNG, WebP) are grids of fixed color pixels - zoom in too far and they become blurry or pixelated. SVG is pure math: it stores mathematical lines, curves, and colors, allowing icons and illustrations to render razor-sharp on everything from mobile screens to 8K displays with tiny file sizes.
Myth: 'Higher DPI Means Better Web Image Quality'
DPI (dots per inch) is purely a physical printing instruction and is completely ignored by web browsers. On phones and computer monitors, image sharpness is determined entirely by pixel dimensions (e.g., 1920x1080) and display density, not the embedded DPI metadata.
Alpha Transparency: PNG vs. WebP
Traditional JPG has zero transparency support - transparent backgrounds turn solid white or black. PNG pioneered clean 8-bit alpha transparency, but WebP now delivers identical transparent quality at up to 40% smaller file sizes.
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