LeanImg groups eleven focused utilities into a single clean interface, and every one of them runs inside your browser rather than on a remote server. That means the AI background remover downloads its model (roughly 180–190 MB) once and then works offline on your machine, while the upscaler uses the Real-ESRGAN-class model with WebGPU/WebGL acceleration where available. Because nothing is uploaded, there are no queues, no per-image credits, and no resolution downgrades on the free tier — a trade-off that shifts the load onto your own hardware.
The feature set covers most everyday image chores: compressing to a target KB size, resizing to exact pixels or 15 social presets, cropping to fixed ratios, converting between JPG, PNG, WebP, AVIF, HEIC, TIFF and PDF, pulling text out of screenshots and scanned PDFs in nine languages, generating compliant passport photos for 205 documents across 92 countries, checking whether an image was AI-generated, and producing full favicon sets with a web manifest. Batch tools accept up to ten files at a time with a 50 MB cap per selection.
LeanImg is operated by Low Battery Studios, a company registered in the Netherlands. It is a genuinely free product with no paid tier, which the team explains as a deliberate choice: hosting static pages and model files costs the same regardless of volume, so the economics do not require credits or watermarks. The site is candid about limitations too — the upscaler guesses detail and can get small faces or lettering wrong, transparent areas turn white in the upscaler, and a target-size compression may convert a PNG into a JPEG.
