Image Compressor
Reduce image file size by adjusting quality. Before/after comparison. Fully client-side — your image never leaves your browser.
📦 Compress Image
Before / After Comparison
Why Compress Images for the Web?
Large image files are the leading cause of slow page loads. A single uncompressed photograph can easily exceed 5 MB, while the same image compressed to quality 80% may be under 500 KB — a 90% reduction — with no visible difference to most viewers. Faster-loading pages improve user experience, reduce bounce rates, and rank higher in search results.
Every 100ms of load time matters. Google's Core Web Vitals use Largest Contentful Paint (LCP) as a ranking signal, and images are usually the largest element on the page. Compressing images is the single highest-impact optimization most websites can make.
JPEG vs WebP — Which Compresses Better?
JPEG has been the web standard for photographs since 1992. It uses DCT-based lossy compression that works well for natural images with smooth gradients. At quality 85%, JPEG typically achieves 60–70% file size reduction compared to uncompressed data.
WebP is a modern format developed by Google that uses more advanced compression algorithms. At equivalent visual quality, WebP files are typically 25–35% smaller than JPEG. WebP is supported by all modern browsers (Chrome, Firefox, Safari 14+, Edge). If you need maximum compression with minimal quality loss, WebP is the better choice.
| Format | Quality | Typical Savings |
|---|---|---|
| JPEG | 85% | 60–70% smaller |
| JPEG | 70% | 75–80% smaller |
| WebP | 80% | 25–35% smaller than JPEG |
Frequently Asked Questions
- How do I reduce image file size?
- Use an image compressor to lower the quality setting. For JPEG, quality 80–85% reduces file size by 60–70% with minimal visible difference. Converting to WebP can reduce file size an additional 25–35% compared to JPEG at the same quality.
- What quality should I use for JPEG?
- For web use, 80–85% offers the best balance. Most viewers cannot tell the difference between 85% and 100%. For thumbnails, 70–75% is fine. Below 60%, artifacts become clearly visible around text and sharp edges.
- What is the difference between lossy and lossless compression?
- Lossy compression (JPEG, WebP) permanently removes data to achieve smaller files — typically 60–80% reduction. Lossless compression (PNG) preserves every pixel exactly but only achieves 10–30% reduction. The data removed by lossy compression is chosen to be least noticeable to human vision.
- Does compressing an image reduce quality?
- Lossy compression does reduce quality, but at moderate settings (75–90%) the difference is nearly imperceptible. Use the before/after comparison slider above to judge whether a quality level is acceptable for your needs.
- What is WebP?
- WebP is a modern image format by Google supporting both lossy and lossless compression. It typically produces files 25–35% smaller than JPEG at equivalent quality. All modern browsers support WebP — it's an excellent choice for web images where file size matters.