Don’s Free PDF

Credits & Licenses

Last updated: October 23, 2026

Don’s Free PDF is built with free, open-source software. Thank you to the people who made it. Each project is used under its license, and the full copyright and license texts are in third-party-licenses.txt.

PDF reading and previews

  • PDF.js — © Mozilla Foundation. Apache License 2.0.
  • PDF.js fonts and image decoders — Foxit fonts and JBIG2 (© PDFium Authors, BSD), Liberation Sans (© Red Hat, Liberation font license), OpenJPEG (BSD 2-Clause), qcms (© Mozilla, MIT).

PDF editing

  • pdf-lib and @pdf-lib/standard-fonts — © Andrew Dillon. MIT License.
  • UPNG — © Photopea. MIT License.
  • pako — © Vitaly Puzrin and Andrei Tuputcyn. MIT and Zlib licenses.
  • tslib — © Microsoft Corporation. 0BSD License.

Encryption and compression

  • qpdf — © Jay Berkenbilt and Manfred Holger. Apache License 2.0.
  • qpdf-wasm — © neslinesli93. ISC License.
  • libjpeg-turbo — IJG License and BSD 3-Clause License. This software is based in part on the work of the Independent JPEG Group.
  • zlib — © Jean-loup Gailly and Mark Adler. Zlib License.

Downloads

  • JSZip — © Stuart Knightley and contributors. Used under the MIT License.

All of this software runs in your browser. Using these projects doesn’t mean their authors endorse Don’s Free PDF. Questions? Email support@donfreepdf.com.