LeanImg – Browser-based image compression, resizing, cropping, and conversion

Summary: LeanImg is a free browser tool that compresses, resizes, crops, and converts images without uploading files. It supports formats like JPG, PNG, WebP, AVIF, and HEIC, delivering instant results while keeping images on the user’s device.

What it does

LeanImg combines four image tools—compressor, resizer, cropper, and converter—using WASM codecs such as MozJPEG and libavif. It offers social media presets, interactive cropping with aspect ratio options, and conversion between 50+ format pairs.

Who it's for

It is designed for users needing multiple image editing functions in one browser-based tool without uploading files to servers.

Why it matters

It solves the need for a unified, privacy-focused image tool that processes files locally without switching between separate apps or uploading images online.