I built this around the same routine I use when a form rejects an upload: check size, reduce dimensions if they’re excessive, and then re-encode with a sensible quality level so text and charts stay readable. Everything runs locally in your browser.
Tip: PNGs with transparency rarely shrink much unless you convert them to JPEG/WebP.
Large images slow down websites, get rejected by upload portals, and fill storage unnecessarily. This image compressor reduces JPG, PNG, and WEBP file sizes using intelligent quality reduction algorithms — all inside your browser, with no server upload.
90–100% quality: Minimal compression; suitable for printing and professional photography archives. Files remain large.
70–85% quality: The "sweet spot" for web use — visually indistinguishable from the original for most images at normal viewing sizes, with 40–70% size reduction.
50–65% quality: Noticeable compression artefacts at high zoom; suitable for thumbnails and social media previews where fine detail is not critical.
Below 50%: Significant quality loss; use only when maximum file-size reduction is more important than image fidelity.
JPG uses lossy compression — each save reduces quality slightly in exchange for significant size savings. It works best for photos and images with gradients. PNG uses lossless compression — reducing size by eliminating redundant colour data without affecting appearance. PNGs with simple graphics, logos, and text benefit most from PNG compression. For photographic content, converting PNG to JPG often gives far greater size reductions than PNG compression alone.