Compress an image online without visible quality loss
Reduce the size of your JPEG, PNG and WebP images online for free. Web and SEO optimization.
Published on January 10, 2026Heavy images slow down your website, degrade your Google PageSpeed score and increase your bounce rate. Compressing images is one of the most impactful optimizations for web performance — and it can be done online, without software.
Understanding the conversion
Image compression can be lossy or lossless. Lossy compression (JPEG, lossy WebP) reduces quality imperceptibly to the eye to achieve 40–80% reductions. Lossless compression (PNG, lossless WebP) optimizes encoding without removing information — 10–30% reduction. WebP offers an average 25–35% additional gain over JPEG at equivalent quality. AVIF offers even more compression but browser support is more recent.
📐 Formula
📊 Conversion table
| Format | Compression type | Typical savings | Transparency | Recommended for |
|---|---|---|---|---|
| JPEG → JPEG opt. | Lossy | 20–60 % | No | Photos |
| PNG → PNG opt. | Lossless | 10–30 % | Yes | Logos, icons |
| JPEG → WebP | Lossy | 25–35 % | Yes | Modern web |
| PNG → WebP | Lossy/Lossless | 26 % | Yes | Universal replacement |
| Any → AVIF | Lossy | 40–50 % vs JPEG | Yes | Recent browsers |
💡 Practical examples
4MB photo (camera JPEG) → compressed to 150KB (80% quality). Savings: -96%. Result: 26× faster loading, visually identical quality at standard display size.
Before: 3 images at 800KB each = 2.4MB. After WebP compression: 3 × 120KB = 360KB. 2MB gain on the page. Direct impact on Google's LCP (Largest Contentful Paint).
A 500KB PNG logo can be losslessly compressed to 120KB with ToolSmartly. No degradation of transparency or edges.