Image Compressor shrinks image file size entirely in your browser, running every step in a background Web Worker so the UI never freezes. Compress many images at once, upload a whole folder, and download everything as a single ZIP. Pick the output format (keep original, JPG, or WebP), tune a quality slider, and see a live size estimate that updates as you drag. PNG gets two modes: high-compression color quantization for the smallest files, or true lossless optimization via the oxipng WebAssembly encoder. Everything runs locally — no upload, no server, fully private.
Drag & drop images here, or use the buttons below
Lower quality = smaller file
Compression runs in a background worker — the UI never freezes.
No images yet. Add files or a folder to begin.
Your data is processed entirely in your browser. Nothing is uploaded to any server.
Yes, Image Compressor is 100% free and runs entirely in your browser.
No. Images are processed locally in your browser for full privacy — they never leave your device.
Common formats such as JPG, PNG, WebP and more, depending on the tool.
No. Image Compressor works in any modern browser, no installation needed.