Image Compressor & Editor
Crop, rotate, scale, and compress images with cutting-edge encoders.
Advanced Image Compression in Your Browser
This tool runs industry-grade image encoders — MozJPEG for JPEG, OxiPNG for PNG, and native WebP encoding — entirely inside your browser via WebAssembly. The same algorithms powering professional optimization tools like ImageOptim and Squoosh are now available with zero uploads and zero privacy risk.
Which Format Should You Choose?
- JPEG (MozJPEG): Best for photographs, gradients, and complex images. MozJPEG produces files up to 10% smaller than standard JPEG at the same quality level. Does not support transparency.
- PNG (OxiPNG): Ideal for screenshots, logos, icons, and images with text or sharp edges. Lossless by default — no quality degradation. Supports full alpha transparency.
- WebP: A modern format from Google offering both lossy and lossless compression. Typically 25–35% smaller than JPEG at equivalent quality. Supported by all modern browsers. If file size is your top priority, choose WebP.
When Image Compression Matters
Unoptimized images are the #1 cause of slow-loading web pages. Google's Core Web Vitals penalize sites with large images, and visitors abandon pages that take more than 3 seconds to load. Compressing images before uploading to your website, blog, or e-commerce store directly improves SEO rankings and conversion rates. Use this tool before uploading product photos, blog hero images, social media graphics, or email newsletter banners.
Privacy First — No Uploads, Ever
Most online image compressors require you to upload your files to a remote server — meaning your photos, screenshots, and sensitive documents pass through a third party. ByteBox runs 100% client-side. The WebAssembly encoders process your image in your browser's memory and the compressed result is downloaded directly. Nothing is ever transmitted. For creating visual assets from scratch, try our Device Mockup Generator or CSS Gradient Generator.