Open source we build on

• pdf-lib (@cantoo/pdf-lib)Version 2.11.1Creates and edits PDF filesMIT

  Copyright

  Copyright (c) 2019 Andrew Dillon

  Includes

  • pdf.js stream and crypto code (Apache-2.0): Copyright 2012 Mozilla Foundation
  • XPDF flate decoder port (Apache-2.0): Copyright 1996-2003 Glyph & Cog, LLC
  • base64-arraybuffer (MIT): Copyright (c) 2012 Niklas von Hertzen
  • UPNG.js (MIT): Photopea
  • Standard 14 font metrics (@pdf-lib/standard-fonts, MIT)
  • culori 4.0.2 (MIT): Copyright (c) 2018 Dan Burzo
  • node-html-better-parser 1.5.9 (MIT): Copyright 2019 Tao Qiufeng
  • html-entities 2.6.0 (MIT): Copyright (c) 2021 Dulin Marat
  • tslib (0BSD): Copyright (c) Microsoft Corporation

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• PDFiumRenders pages, reads text and flattens formsBSD-3-Clause AND Apache-2.0

  Copyright

  Copyright 2014 The PDFium Authors

  Includes

  • FreeType (FTL): Copyright (C) 1996-2024 by David Turner, Robert Wilhelm, and Werner Lemberg
  • libjpeg-turbo (IJG AND BSD-3-Clause AND Zlib): Copyright (C) The libjpeg-turbo Project and many others; Copyright (C) 1991-2020 Thomas G. Lane, Guido Vollbeding
  • OpenJPEG (BSD-2-Clause): Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium; Copyright (c) 2002-2014, Professor Benoit Macq; and other contributors
  • Little CMS 2 (MIT): Copyright (c) 1998-2024 Marti Maria Saguer
  • libpng 1.6.43 (libpng-2.0): Copyright (c) 1995-2024 The PNG Reference Library Authors; Copyright (c) 2018-2024 Cosmin Truta
  • zlib 1.3.1 (Zlib): Copyright (C) 1995-2024 Jean-loup Gailly and Mark Adler
  • Anti-Grain Geometry 2.3 (AGG license): Copyright (C) 2002-2005 Maxim Shemanarev

  Required acknowledgements

  • Portions of this software are copyright © 2024 The FreeType Project (www.freetype.org). All rights reserved.
  • This software is based in part on the work of the Independent JPEG Group.

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• @embedpdf/pdfiumVersion 2.15.1WebAssembly build of PDFiumMIT

  Copyright

  Copyright (c) 2024 CloudPDF, Ji Chang

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• qpdfEncrypts, decrypts, checks and repairs PDF filesApache-2.0

  Copyright

  Copyright (c) 2005-2021 Jay Berkenbilt
  Copyright (c) 2022-2025 Jay Berkenbilt and Manfred Holger

  Includes

  • libjpeg-turbo 2.1.1 (IJG AND BSD-3-Clause AND Zlib): Copyright (C) 1991-2021 The libjpeg-turbo Project and many others
  • zlib (Zlib): Copyright (C) Jean-loup Gailly and Mark Adler

  Required acknowledgements

  • This software is based in part on the work of the Independent JPEG Group.

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• @neslinesli93/qpdf-wasmVersion 0.3.0WebAssembly build of qpdfISC

  Copyright

  No copyright line is published; the package declares the ISC license (neslinesli93)

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• jSquashRuns the image codecs below in WebAssemblyApache-2.0

  Copyright

  Copyright [2023] jamsinclair

  Includes

  • Codecs ported from Squoosh (Apache-2.0 and the licenses below): Google Inc.

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• MozJPEG (libjpeg-turbo)Encodes and decodes JPEG imagesIJG AND BSD-3-Clause AND Zlib

  Copyright

  Copyright (C)2009-2020 D. R. Commander. All Rights Reserved.
  Copyright (C)2015 Viktor Szathmáry. All Rights Reserved.

  Required acknowledgements

  • This software is based in part on the work of the Independent JPEG Group.

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• Squoosh PNG codecEncodes and decodes PNG imagesBSD-3-Clause

  Copyright

  Copyright (c) 2010, Google Inc. All rights reserved.

  Includes

  • png 0.17.10 (MIT OR Apache-2.0)
  • flate2 1.0.28 (MIT OR Apache-2.0)
  • miniz_oxide 0.7.1 (MIT OR Zlib OR Apache-2.0)
  • fdeflate 0.3.3 (MIT OR Apache-2.0)
  • crc32fast 1.3.2 (MIT OR Apache-2.0)

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• libwebpDecodes WebP images (@jsquash/webp 1.5.0)BSD-3-Clause

  Copyright

  Copyright (c) 2010, Google Inc. All rights reserved.

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• oxipngOptimizes PNG images without quality lossMIT

  Copyright

  Copyright (c) 2016 Joshua Holmer

  Includes

  • libdeflate via libdeflater 1.20.0 (MIT): Copyright 2016 Eric Biggers
  • indexmap 2.2.6 (MIT OR Apache-2.0)
  • hashbrown 0.14.5 (MIT OR Apache-2.0)
  • bitvec 1.0.1 (MIT)
  • wyz 0.5.1 (MIT)

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• resizeResizes imagesMIT

  Copyright

  Copyright (c) 2015 PistonDevelopers

  Includes

  • magic-kernel resizer (MIT): Copyright (c) 2024 Serhii Tatarintsev
  • hqx pixel-art resizer, from Squoosh (Apache-2.0)

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• Tesseract OCR (tesseract.js)Version 7.0.0Recognizes text in scanned pages (OCR), loaded only when you run OCRApache-2.0

  Copyright

  Copyright tesseract.js contributors (Jerome Wu, Balearica and others); Tesseract: Copyright Google Inc. and Hewlett-Packard

  Includes

  • tesseract.js 7.0.0 and tesseract.js-core 7.0.0 (Apache-2.0)
  • Tesseract (Apache-2.0): Copyright Google Inc. and Hewlett-Packard Development Company
  • Leptonica (BSD-2-Clause): Copyright (C) 2001 Leptonica
  • libjpeg 9 (IJG): Copyright (C) 2014, Thomas G. Lane, Guido Vollbeding
  • libpng 1.6.38 (libpng-2.0): Copyright (c) 1995-2022 The PNG Reference Library Authors
  • zlib 1.2.12 (Zlib): Copyright (C) 1995-2022 Jean-loup Gailly and Mark Adler
  • libtiff (libtiff): Copyright (c) 1988-1997 Sam Leffler, Copyright (c) 1991-1997 Silicon Graphics, Inc.
  • libwebp (BSD-3-Clause): Copyright (c) 2010, Google Inc.
  • buffer (MIT): Copyright Feross Aboukhadijeh
  • ieee754 (BSD-3-Clause): Copyright Feross Aboukhadijeh
  • regenerator-runtime (MIT): Copyright (c) 2014-present, Facebook, Inc.
  • zlib.js (MIT): Copyright 2012 imaya
  • bmp-js (MIT): Copyright (c) 2014 @shaozilee
  • wasm-feature-detect (Apache-2.0): Copyright Google Inc.

  Required acknowledgements

  • This software is based in part on the work of the Independent JPEG Group.

  Read the license textWebsiteSource code

• Tesseract language data (tessdata_best, integer models)Version 4.0.0_best_intEnglish and Indonesian OCR models, downloaded on first useApache-2.0

  Copyright

  Copyright Google Inc. (tesseract-ocr/tessdata_best); npm packaging @tesseract.js-data (MIT)

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• docxVersion 9.10.0Writes Word (.docx) filesMIT

  Copyright

  Copyright (c) 2016 Dolan

  Includes

  • JSZip 3.10.2 (dual-licensed MIT OR GPL-3.0-or-later, used under MIT): Copyright (c) 2009-2016 Stuart Knightley, David Duponchel, Franz Buchinger, António Afonso
  • pako 1.0.11 (MIT AND Zlib): Copyright (C) 2014-2017 by Vitaly Puzrin and Andrei Tuputcyn
  • xml-js 1.6.11 (MIT): Copyright (c) 2016 Yousuf Almarzooqi
  • xml 1.0.1 (MIT): Copyright (c) 2011 Dylan Greene
  • hash.js 1.1.7 (MIT): Copyright Fedor Indutny, 2014
  • nanoid (MIT): Copyright 2017 Andrey Sitnik
  • sax 1.6.1 (BlueOak-1.0.0): Copyright Isaac Z. Schlueter and contributors
  • lie, immediate, readable-stream, setimmediate, core-util-is, isarray, process-nextick-args, safe-buffer, string_decoder, util-deprecate (MIT); inherits, minimalistic-assert (ISC)

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• fflateVersion 0.8.3Creates ZIP filesMIT

  Copyright

  Copyright (c) 2026 Arjun Barrett

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• PreactVersion 10.29.8Runs the interactive tool screensMIT

  Copyright

  Copyright (c) 2015-present Jason Miller

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• Preact SignalsVersion 2.11.3Keeps the tool screens up to dateMIT

  Copyright

  Copyright (c) 2022-present Preact Team

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• AstroVersion 7.3.8Builds the site pagesMIT

  Copyright

  Copyright (c) 2021 Fred K. Schott

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• LucideVersion 1.55.0IconsISC AND MIT

  Copyright

  Copyright (c) 2026 Lucide Icons and Contributors

  Includes

  • Feather icons (MIT): Copyright (c) 2013-present Cole Bemis

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The complete text of every license is in the notices file: /third-party-licenses.txt