ConvertIt converts images, video, audio, and documents between formats — entirely in your browser. No uploads, no sign-up, no watermarks. Your files never leave your device. Built with Next.js, ffmpeg.wasm, Canvas API, Web Audio, pdf-lib, and Three.js. 100% client-side, open source. Supports: PNG, JPEG, WebP, AVIF, HEIC, MP4, WebM, MOV, MP3, WAV, FLAC, PDF, SVG, and more.