Image Compressor

krzen.com compresses images entirely in your browser with no file uploads, no servers, and no file size limits. It supports JPEG, PNG, WebP, and AVIF formats with adjustable quality, resizing, and before/after comparison. All processing is client-side for maximum privacy.

WebP typically achieves 25-35% smaller file sizes than JPEG at equivalent visual quality. It supports both lossy and lossless compression, plus transparency. JPEG is more universally supported but WebP is now supported by all modern browsers. AVIF is even better, achieving 50% smaller than JPEG.

Use quality settings between 70-85% for imperceptible quality loss with significant size reduction. Convert to WebP or AVIF format. Resize images to their display dimensions (don't serve 4000px images in 800px containers). Our tool shows the exact savings and visual comparison.

AVIF (AV1 Image File Format) is a modern image format based on the AV1 video codec. It achieves 50% smaller file sizes than JPEG and 20% smaller than WebP at equivalent quality. Supported by Chrome, Firefox, and Safari 16+. krzen.com automatically detects if your browser supports AVIF encoding.

Reducing image sizes by 50-70% can save 1-5 seconds on 3G connections and 0.1-0.5 seconds on broadband. For a site with 100,000 monthly visitors, this translates to significant bandwidth savings. Our Page Load Impact calculator shows exact time savings across different connection types.

Yes, completely. krzen.com processes all images directly in your browser using the HTML5 Canvas API. Your images are never uploaded to any server. The entire compression happens client-side, so your files remain private on your device.