• Next.js and ReactThe site itselfMIT
• pdf-libMaking and editing PDFsMIT
• PDF.jsReading and drawing PDF pagesApache 2.0
• qpdfProtecting and unlocking PDFsApache 2.0
• fflateZIP downloads and PDF streamsMIT
• ffmpeg.wasmThe video toolsMIT
• FFmpeg, with x264The video engine ffmpeg.wasm runsGPL 2.0 or later
• Tesseract.jsImage to textApache 2.0
• MediaPipeFinding faces to blurApache 2.0
• ONNX Runtime WebRunning the background removal modelMIT
• heic-to and libheifOpening iPhone HEIC photosLGPL 3.0

Each library’s source code and full license is at the link with its name.