Image Optimizer: Shrink JPG, PNG, WebP, Same Format

You already have a JPG, PNG, or WebP and you want the same file, just smaller, so a CDN bill drops or a page finally fits its weight budget. This tool keeps the format and reduces the bytes, choosing the method per file by reading the magic bytes at the start of the file. It will never hand back something larger than what you dropped in: after optimizing, it compares sizes and returns the original untouched if the new encode isn't actually smaller. PNG goes through oxipng, and this path is genuinely lossless. It rewrites the deflate stream, tries different filter heuristics, and strips redundant chunks, so every pixel and the full alpha channel come back byte-for-byte identical to the source, just packed tighter. This is the path to trust when exact color matters: logos, UI screenshots, diagrams, anything with sharp edges or transparency. JPEG and WebP work differently. JPEG is decoded and re-encoded with mozjpeg at quality 80; WebP is decoded and re-encoded at a comparable setting. Both are lossy steps, so you get a fresh, smaller encode rather than a bit-identical copy. At these settings the loss is usually hard to notice on typical web images, but it is a real re-encode, not magic, and stacking it on top of an already-compressed photo is where artifacts start showing. Animated WebP is detected and left alone, since the in-browser decoder can only read a single frame and re-encoding would flatten the animation. Everything runs locally through WebAssembly codecs. The file never leaves your machine, there's no upload step, and nothing is written to a server. Drop a file in, get the result back, done.