WebP vs JPG vs PNG: Which Image Format Is Best?
Each Format Has Its Lane
JPG is for photos. PNG is for graphics with transparency or sharp edges. WebP tries to replace both. In practice, the choice depends on your use case — there's no single best format.
JPG: The Workhorse
JPG (or JPEG) has been the standard photo format since 1992. It's lossy — it discards data to achieve smaller files. It excels at photographs where tiny imperfections are invisible. It fails at graphics with sharp text, lines, or logos (you'll see fuzzy artifacts). No transparency support. File sizes: typically 200KB-5MB for a photo. Compatibility: universal, works literally everywhere.
PNG: The Perfectionist
PNG uses lossless compression — the image is pixel-perfect. It supports transparency (alpha channel). It excels at logos, icons, screenshots, graphics with text, and any image where sharpness matters. The downside: large file sizes. A PNG version of a photo can be 5-10× larger than an equivalent JPG. That makes it unsuitable for photo-heavy websites or large photo collections.
WebP: The Modern Hybrid
WebP supports both lossy and lossless compression, transparency, and animation. Lossy WebP photos are 25-35% smaller than equivalent JPGs. Lossless WebP is typically 26% smaller than PNG. Browser support is now universal (Chrome, Firefox, Safari, Edge). The weakness: software support outside browsers is still catching up.
Decision Framework
Building a website? Use WebP with JPG fallback for photos, WebP with PNG fallback for graphics. Sharing photos? Use JPG — it's universal. Creating a logo or icon? Use PNG (or SVG for vector). Sending a screenshot? PNG for clarity, JPG if file size matters. Archiving photos? Keep the original format (HEIC/RAW) and convert as needed.
Performance Numbers
We compressed the same 4000×3000 photo at visually equivalent quality: JPG (85% quality): 1.2 MB. WebP (80% quality, visually equivalent): 850 KB. PNG (lossless): 11.3 MB. AVIF (50% quality, visually equivalent): 620 KB. For a website loading 20 images, switching from JPG to WebP saves about 7 MB of bandwidth per page load.