PDFStay

Open Source Licenses

PDFStay is built with open source PDF components and keeps their license notices available.

PDFLince

PDFLince is an important architectural reference for browser-based PDF workers and object optimization. License: MIT. Copyright (c) 2026 PDFLince.

PDF.js

PDF.js is used to read and render PDF pages in the browser. License: Apache-2.0.

pdf-lib

pdf-lib is used to rewrite PDF objects, embed images, and generate output PDFs. License: MIT.