ImgOptimizer — Free Online Image Optimizer

ImgOptimizer is a free, browser-based image optimization tool. Compress, resize, and convert images to JPEG, WebP, AVIF, or PNG format instantly — no upload required, no server processing. Your images never leave your device.

Features

• Compress JPEG, WebP, AVIF, and PNG images with adjustable quality
• Resize images by width, height, percentage, or aspect ratio
• Convert between image formats in one click
• Batch optimization — process multiple images at once
• Social media presets for Instagram, X (Twitter), LinkedIn, Facebook
• 100% private — all processing happens in your browser via WebAssembly

Developer API

ImgOptimizer provides a REST API at imgoptimizer.com/api/img for programmatic image optimization. Free plan includes 500 requests per month. Sign in with Google to get your API token.

How to use

Drop an image file onto the page, paste an image URL, or click to browse. Adjust quality, size, and output format using the controls. Download the optimized image or copy the URL.