A free, open-source tool that shrinks JPG, PNG and WebP images right in the browser. Nothing is uploaded.

Most online image compressors upload your photos to a server before giving them back. I wanted one that never lets the files leave your device.

Image Compressor runs entirely in the browser. It uses the same encoders the big online tools use (MozJPEG, OxiPNG and libwebp), compiled to WebAssembly and run in background workers, so the page stays responsive while it works. The app makes no network requests at all: fonts, styles and codecs all ship with the build.

Smart mode uses an SSIM image-similarity check to find the smallest file that still looks the same as the original.

Compresses JPG, PNG and WebP, and converts between them (PNG output is always lossless)

Smart quality targeting, or manual quality control

Strips EXIF and GPS data before download

Optional resize to a maximum width or height

Batch processing with a single ZIP download

Before/after slider to compare quality

Drag and drop, file browse or paste from the clipboard

Dark mode and remembered settings

I designed and built it end to end: the interface, the compression pipeline and the release setup. It's free, needs no sign-up, and the code is public on GitHub.

Preview: compress.xocoweb.com Code: github.com/andreialba/image-compressor