Free Online Image Compressor — Reduce Image File Size Instantly
Compress JPEG, PNG, WebP, AVIF and JPEG XL images to reduce file size while maintaining visual quality with our free online image compressor. Using WebAssembly-powered codecs (MozJPEG, Oxipng, libwebp, libavif, libjxl), your images are compressed locally without ever being uploaded to a server. Simply upload and download. Perfect for web developers optimizing page load times, designers preparing images for email, or anyone who needs to shrink image files quickly.
Upload one or more images. Supported formats: JPG, JPEG, PNG, WebP, AVIF, JXL.
Images are compressed automatically at 80% quality using format-optimized codecs. No settings to adjust.
Download the compressed images individually or all at once as a ZIP archive.
Tips for Compressing Images
- JPEG compression typically achieves 50-70% size reduction at 80% quality with minimal visual loss.
- PNG uses lossless Oxipng optimization — file size is reduced without any quality loss, ideal for graphics with sharp edges.
- JPEG XL offers the best compression ratios — up to 60% better than JPEG at the same quality, surpassing even WebP and AVIF.
Frequently Asked Questions — Image Compressor
Is the image compressor free?
Yes, completely free. No registration, no hidden charges, and no file size limits. All compression happens locally in your browser.
How does image compression work?
The tool decodes your image using WebAssembly-based codecs (MozJPEG for JPEG, Oxipng for PNG, libwebp for WebP, libavif for AVIF, libjxl for JPEG XL) and re-encodes it at optimized quality settings — all running locally in your browser.
What compression ratio can I expect?
JPEG at 80% quality typically achieves 50-70% size reduction. WebP can achieve 25-35% better compression than JPEG. AVIF offers 50% better compression. JPEG XL offers up to 60% better compression than JPEG. PNG optimization is lossless.
What quality setting is used?
The tool uses 80% quality by default, which offers the best balance of compression and visual quality for most use cases. No manual adjustment needed.
What image formats are supported?
Input and output: JPEG, PNG, WebP, AVIF, and JPEG XL. The output format always matches the input format.
Is the compression lossy or lossless?
JPEG, WebP, AVIF and JPEG XL use lossy compression at 80% quality. PNG uses lossless Oxipng optimization — file size is reduced without any quality loss.
Can I compress multiple images at once?
Yes, batch compression is fully supported. Upload multiple images, adjust quality settings once, and compress all images with the same settings.