Compress images locally with adjustable quality and output format, all processing happens in your browser
Image Tools
About This Tool
Image Compressor is a browser-based tool that reduces image file sizes using canvas-based compression for JPEG and WebP, and UPNG.js for PNG quantization. It features adjustable quality control, multiple output formats, real-time preview, and file size comparison — all processing happens locally in your browser with zero server dependency.
Key Features
- Adjustable quality slider from 0.1 to 1.0 for precise compression control
- Output format selection between JPEG, WebP, and PNG
- PNG lossy compression using UPNG.js with color quantization
- Real-time preview of compressed image before downloading
- File size comparison showing original and compressed sizes
- One-click download of compressed image in selected format
Use Cases
- Optimize website images to improve page load speed and Core Web Vitals
- Reduce image file sizes before uploading to platforms with size limits
- Convert images to WebP format for modern web performance
- Compress PNG screenshots with lossy quantization for smaller files
- Prepare product images for e-commerce sites with strict size requirements
image
compress
JPEG
WebP
PNG
Frequently Asked Questions
What image formats does the compressor support?
The tool supports JPEG, WebP, and PNG output formats. You can upload any common image format and choose your preferred output format with adjustable quality settings.
How does the quality slider work?
The quality slider ranges from 0.1 to 1.0 and controls the compression level. Lower values produce smaller files with more quality loss, while higher values preserve quality but result in larger files.
Does PNG compression use a different method?
Yes, for PNG output the tool uses the UPNG.js library for lossy PNG compression with quantization, which is different from the canvas-based compression used for JPEG and WebP formats.
Is my data safe when using this tool?
Absolutely. All image processing happens locally in your browser. No images are uploaded to any server, ensuring your files remain completely private and secure.
Can I use this tool on my phone?
Yes, the Image Compressor is fully responsive and works on all devices including smartphones, tablets, and desktop computers.