LessMB

LessMB is a free online tool for compressing images (JPG, PNG, WebP, AVIF, HEIC), videos (MP4, MOV), PDFs, and ZIP files locally in the browser using WebAssembly and WebCodecs. Files stay on the user's device during processing. Users can choose Smart, target-size, or quality-focused modes, process multiple files, and download results in their browser. No account, watermarks, or paywall is required. LessMB is useful for people who want a convenient, private way to reduce file sizes without uploading their files to a server.