Free JXL compression with smart quality-size balance and real-time preview
All image processing is done locally in your browser via WebAssembly, ensuring privacy. Smart compression balances quality and size, supports batch processing, before/after comparison, and one-click download. Optimizes image loading and transfer efficiency for SEO, social media, email, and more.
What is JXL?
JXL (JPEG XL) is a next-gen high-efficiency image format supporting lossy/lossless compression, transparency, wide color gamut, and HD quality. At equivalent quality, it is far smaller than JPG/PNG. Compatible with modern browsers and platforms, it is the next-generation high-performance image standard.
Why compress JXL?
JXL already has high compression efficiency, but further optimization can make images even smaller, significantly boosting load speeds for web pages, mini-programs, and apps, saving storage and data while maintaining visually lossless quality.
How does JXL compression work?
JXL uses a hybrid coding architecture based on DCT and Gabor transforms. Lossy mode compresses visual redundancy through adaptive quantization and perceptual optimization. Lossless mode uses reversible transform units for fully lossless restoration. Quality parameters can be flexibly adjusted to achieve ultra-high compression ratios while preserving quality, wide color gamut, and transparency.
Choose Quality Level?
Use Case Quality Level Compression Ratio Notes HD photography, design work, print materials 90-100 10-30% Visually lossless, preserves all detail, color, and clarity Web graphics, product displays, social platforms 75-89 40-60% Balanced quality and size, best general choice, no visible difference Thumbnails, list images, previews 60-74 60-80% High compression, compact size, extremely fast loading Extreme optimization, low-bandwidth, batch storage Below 60 80%+ Minimal size, ideal for fast loading and bulk asset storage Privacy & Security?
No registration required. All processing is done locally in your browser via WebAssembly. Images are never uploaded to the cloud, collected, or stored. Your privacy is fully protected.
How to Use?
1Adjust QualityAuto by default, or set a custom quality value2Add FilesSelect, select all, or drag and drop to compress3DoneClick thumbnails to compare before/after4SaveSave individual images or download all