How to Use
Drag and drop images or select files to start compression automatically. You can also paste from clipboard (Ctrl+V / Cmd+V). Adjust the compression ratio with the quality slider. Choose from presets (Low, Medium, High) or fine-tune with the slider. In "Target Size" mode, specify the target file size in KB and the tool will automatically find the optimal quality setting. Download compressed images individually or as a ZIP archive.
JPEG Compression
This tool uses the MozJPEG engine (WebAssembly version), developed by Mozilla. Compared to standard browser JPEG encoding, MozJPEG produces 20-35% better quality at the same file size. It excels with photographs and natural images that have rich textures and detail. The default quality of 80 provides an excellent balance between quality and file size reduction.
PNG Optimization
PNG images are optimized with OxiPNG, a fast PNG optimizer written in Rust. It reduces file sizes by 5-30% through lossless optimization — removing unnecessary metadata and optimizing compression filters without any quality loss. PNG supports transparency (alpha channel), making it ideal for logos, icons, and screenshots. Transparency is preserved during optimization.
WebP Conversion
Select "WebP" as the output format to convert JPEG and PNG images to WebP. WebP is a next-generation image format by Google that achieves 25-35% smaller file sizes than JPEG at equivalent quality. Converting your website or blog images to WebP can significantly improve page load times. We also offer a dedicated WebP conversion tool.
Privacy & Security
All image processing happens entirely in your browser. Images are never uploaded to any server. The tool works even without an internet connection. By default, EXIF metadata (including date, GPS location, and camera info) is automatically removed to protect your privacy. If you need to preserve EXIF data such as the capture date, enable the "Preserve EXIF" option.
FAQ
- How do I compress an image?
- Simply drag and drop your images into this tool to start compressing. You can adjust the compression ratio with the quality slider, or use "Target Size" mode to specify a target file size. All processing happens in your browser — images are never uploaded to any server.
- Which is smaller, JPG or PNG?
- Generally, photos are smaller as JPG (JPEG) due to lossy compression. PNG is better for illustrations and screenshots with fewer colors, as it uses lossless compression that preserves quality perfectly. For the smallest file sizes, consider converting to WebP format.
- Does image compression reduce quality?
- This tool uses the MozJPEG engine, which produces 20-35% better quality at the same file size compared to standard browser JPEG encoding. PNG images are optimized losslessly with OxiPNG, meaning zero quality loss. You can fine-tune the compression ratio with the quality slider.
- Is there a free image compression tool?
- This tool is completely free — no installation, no registration required. It works entirely in your browser, so you can use it on any device including Windows, Mac, and smartphones. Batch process up to 20 files at once.
- WebP vs JPEG — which is better?
- WebP, developed by Google, achieves 25-35% smaller file sizes than JPEG at equivalent quality. As of 2026, over 99% of major browsers support WebP. It's highly recommended for website and blog images. This tool includes a WebP conversion feature in the output format options.
- How much should I compress for LCP improvement?
- Aim for 100KB per image (200KB max for hero images). LCP (Largest Contentful Paint) should be under 2.5s for 'Good' Core Web Vitals. Quality 80 + WebP + 1200px width is a solid default.
- How much can Excel/Word attached images be compressed?
- Photos directly pasted from smartphone (5-10MB each) can blow up file sizes. Compressing to quality 80 / 1200px wide brings each image to 200-500KB, shrinking the whole file 10-30x.
- Print vs. web — how do compression settings differ?
- Print: 300DPI+ / quality 90-100 (or lossless). Web: 72-96DPI / quality 75-85. For web, WebP saves an additional 25-35%.
- How can I tell if compression caused quality loss?
- Use the 'Compare' button to view before/after. Check for: jaggy edges, banding in gradients, blurred text, block noise in skin or sky. Quality 75-85 typically shows no visible loss.