PNG to JPG Converter
Convert PNG images to JPG/JPEG format using MozJPEG for superior compression (10-15% better than standard JPEG). Adjust quality, background color, and advanced options. Upload up to 100 files (max 100 MB each).
Drop PNG images here or click to browse
Maximum 100 files • 100 MB per file • 0/100 uploaded
About PNG to JPG Conversion with MozJPEG
This tool converts PNG images to JPG/JPEG format using MozJPEG via WebAssembly (jSquash). MozJPEG provides 10-15% better compression than standard JPEG at the same quality level. All processing happens locally in your browser for maximum privacy and security.
Features:
- • Upload up to 100 PNG images at once
- • Maximum 100 MB per file
- • MozJPEG encoder for superior compression
- • Adjustable JPEG quality (10-100%)
- • Progressive JPEG support for faster web loading
- • Advanced chroma subsampling options
- • Trellis optimization for smaller files
- • Custom background color for transparency
- • Thumbnail preview for each image
- • Individual or batch download (ZIP)
- • Real-time conversion statistics
MozJPEG Advantages:
- • 10-15% better compression than standard JPEG encoders
- • Used by Mozilla, Facebook, and other major companies
- • Produces smaller files at same visual quality
- • Progressive JPEG for better web performance
- • Advanced optimization algorithms
- • 100% compatible with all JPEG decoders
Quality Guidelines:
- • 90-95: High quality, suitable for print and archival
- • 75-85: Good quality, recommended for web use (default: 85)
- • 60-75: Medium quality, smaller file size
- • Below 60: Low quality, noticeable compression artifacts
- • MozJPEG produces better results than standard JPEG at same quality level
Transparency Handling:
- • JPG format does not support transparency
- • PNG transparent areas replaced with selected background color
- • Alpha blending ensures smooth transitions
- • Default background: White (#FFFFFF)
- • Choose background color matching your intended use
- • Preview shows how transparency will be handled
Advanced Options Explained:
- • Progressive JPEG: Images load from low to high quality (recommended for web)
- • Optimize Coding: Uses trellis optimization for 2-5% smaller files
- • Chroma Subsampling:
- - 4:4:4: No subsampling, best quality, larger file
- - 4:2:0: Standard subsampling, good quality, smaller file (recommended)
- - 4:2:2: Balanced option for medium file sizes
When to Convert PNG to JPG:
- • Reduce file size for web optimization
- • Image doesn't need transparency
- • Photos and complex images (not icons or logos)
- • Improve page load speed
- • Prepare images for platforms that don't support PNG
Technical Details:
- • Uses jSquash library (WebAssembly compiled MozJPEG)
- • WASM modules cached after first load (500KB-1MB)
- • High-quality PNG decoder from Rust PNG crate
- • Optional image resizing with high-quality algorithms
- • All processing happens client-side (no server upload)
Privacy: All image conversion happens in your browser using WebAssembly. Your images are never uploaded to any server. WASM modules are downloaded once and cached. Everything is processed locally for maximum security and privacy.