Open-source licenses

Convertmaxxing stands on excellent open-source software. Image conversion is powered by ImageMagick and its delegate libraries, compiled to WebAssembly; video and audio conversion are powered by Mediabunny on the browser's WebCodecs API, with MP3 encoding courtesy of LAME.

magick-wasmApache-2.0
The WebAssembly port of ImageMagick by Dirk Lemstra.
ImageMagick delegate librariesvarious (incl. LGPL)
Format support comes from bundled libraries including libheif and libde265 (HEIC), libraw (camera RAW), libjxl (JPEG XL), libwebp (WebP), libaom/libavif (AVIF), libjpeg-turbo, libpng, libtiff, and others. Full list and license texts in the magick-wasm NOTICE file.
MediabunnyMPL-2.0
The video and audio engine by Vanilagy: reading, writing, and converting media containers on top of the browser’s WebCodecs API — no server, no FFmpeg.
@mediabunny/mp3-encoderMPL-2.0
Mediabunny’s MP3 encoding extension — browsers can’t encode MP3 natively, so this is what makes MP3 output work here, in every browser.
LAMELGPL
The venerable LAME MP3 encoder, compiled to WebAssembly inside @mediabunny/mp3-encoder. The LAME project asks converters that use it for a shoutout with a link — gladly: thank you, LAME.
ReactMIT
The UI library.
TanStack Router & StartMIT
Routing, prerendering, and the application framework.
React Aria ComponentsApache-2.0
Accessible UI primitives (drop zone, sliders, selects).
Tailwind CSSMIT
Styling.
ZustandMIT
Client state for the conversion queue.
client-zipMIT
Streaming zip generation for batch downloads.
sonnerMIT
Toast notifications.