Open Source Licenses

Last updated: September 28, 2026

Some ClickSolveTools tools use open-source libraries written by other people. This page lists every one of them as our pages load it today: the exact version, its license, where it is downloaded from, and the tools that use it. We are grateful to their authors.

A library is downloaded only when you open a tool that needs it, and it runs in your browser. Your inputs and files are not sent to the library providers. Where a tool asks for a library without a version number, the network serves the newest release, so we show the version it served on the date above. How these downloads affect your privacy is explained in our Privacy Policy.

Libraries loaded by the tools

• PDF.js

  Apache License 2.0

  Reads and renders PDF pages and extracts their text. By Mozilla.

  3.11.174 from cdnjs.cloudflare.com

  Used in: PDF Image Extractor, PDF Password Remover, PDF to JPG, PDF to PNG, PDF to Word

  4.0.379 (pdfjs-dist) from cdn.jsdelivr.net

  Used in: PDF to Text Extractor

  Source codeLicense text

• pdf-lib

  MIT License

  Creates and edits PDF files: merging, splitting, rotating, numbering and watermarking pages. By Andrew Dillon.

  1.17.1 from cdn.jsdelivr.net

  Used in: PDF Metadata Viewer, PDF Page Extractor, PDF Page Numberer, Text to PDF

  Latest release from cdn.jsdelivr.net (1.17.1 on September 28, 2026)

  Used in: Image to PDF Converter, PDF Compressor, PDF Merger, PDF Page Rotator, PDF Splitter, PDF Watermark Adder

  Source codeLicense text

• @pdf-lib/standard-fonts

  MIT License

  Font measurements for the 14 standard PDF fonts, used when drawing watermark text. By Andrew Dillon.

  Latest release from cdn.jsdelivr.net (1.0.0 on September 28, 2026)

  Used in: PDF Watermark Adder

  Source codeLicense text

• JSZip

  MIT License or GPL-3.0 (dual licensed; used here under MIT)

  Bundles several output files into one ZIP download. By Stuart Knightley and contributors.

  3.10.1 from cdnjs.cloudflare.com

  Used in: Image Format Converter, Image Resizer

  3.10.1 from cdn.jsdelivr.net

  Used in: PDF Image Extractor, PDF to JPG, PDF to PNG, PDF to Word

  Latest 3.x release from cdn.jsdelivr.net (3.10.2 on September 28, 2026)

  Used in: PDF Splitter

  Source codeLicense text

• jsPDF

  MIT License

  Builds a new PDF from rendered page images. By James Hall and contributors.

  2.5.1 from cdnjs.cloudflare.com

  Used in: PDF Password Remover

  Source codeLicense text

• mammoth.js

  BSD 2-Clause License

  Reads Word (.docx) documents and converts them to HTML or plain text. By Michael Williamson.

  1.6.0 from cdnjs.cloudflare.com

  Used in: DOCX Word Counter, Word to PDF

  Latest release from cdn.jsdelivr.net (1.13.0 on September 28, 2026)

  Used in: DOCX to HTML Converter

  Source codeLicense text

• marked

  MIT License

  Converts Markdown text to HTML. Its license file also carries the original Markdown BSD-style notice by John Gruber. By MarkedJS and Christopher Jeffrey.

  Latest release from cdn.jsdelivr.net (18.0.14 on September 28, 2026)

  Used in: Markdown Preview, Markdown to HTML Converter, Markdown to PDF

  Source codeLicense text

• highlight.js

  BSD 3-Clause License

  Colors code blocks in rendered Markdown. The GitHub theme stylesheet from the same release is loaded too. By highlight.js contributors.

  11.9.0 from cdnjs.cloudflare.com

  Used in: Markdown Preview

  Source codeLicense text

• math.js

  Apache License 2.0

  Parses and evaluates math expressions. By Jos de Jong and contributors.

  11.11.0 from cdnjs.cloudflare.com

  Used in: Calculator

  Source codeLicense text

• QRCode.js

  MIT License

  Draws QR codes from text or links. By davidshimjs.

  1.0.0 from cdnjs.cloudflare.com

  Used in: QR Code Generator

  Source codeLicense text

• jsQR

  Apache License 2.0

  Finds and decodes QR codes in images and camera frames. By Cosmo Wolfe.

  1.4.0 from cdn.jsdelivr.net

  Used in: QR Code Reader

  Source codeLicense text

• JsBarcode

  MIT License

  Draws barcodes such as Code 128, EAN and UPC. By Johan Lindell.

  3.11.6 from cdn.jsdelivr.net

  Used in: Barcode Generator

  Source codeLicense text

• js-yaml

  MIT License

  Parses YAML so it can be converted to JSON. By Vitaly Puzrin and contributors.

  4.1.0 from cdn.jsdelivr.net

  Used in: YAML to JSON Converter

  Source codeLicense text

• lamejs

  GNU LGPL 3.0

  Encodes audio to MP3. It is a JavaScript port of the LAME MP3 encoder (lame.sourceforge.net) and is loaded unmodified as a separate file, so it can be inspected or replaced. By Alex Zhukov and contributors.

  1.2.1 from cdnjs.cloudflare.com

  Used in: Audio Format Converter

  Source codeLicense text

• heic-to

  LGPL-3.0

  Decodes iPhone HEIC and HEIF photos in the browser so they can be saved as JPG or PNG. It bundles libheif (LGPL-3.0) and libde265 (LGPL-3.0), compiled to WebAssembly. The library is loaded unmodified from its public package; you can get its complete source code from the links here.

  1.5.2 from cdn.jsdelivr.net

  Used in: HEIC to JPG Converter, Image to Text Converter (OCR)

  Source codeLicense text

• libheif

  LGPL-3.0

  The HEIF image decoder by struktur AG that heic-to wraps (included inside the heic-to package).

  Bundled in heic-to 1.5.2

  Used in: HEIC to JPG Converter

  Source codeLicense text

• Tesseract.js

  Apache License 2.0

  Optical character recognition (OCR) in the browser: reads the text in photos, screenshots and scanned pages. Includes tesseract.js-core, the Tesseract OCR engine compiled to WebAssembly.

  7.0.0 (tesseract.js and tesseract.js-core) from cdn.jsdelivr.net

  Used in: Image to Text Converter (OCR)

  Source codeLicense text

• Tesseract language data

  Apache License 2.0

  Trained language models that let the OCR engine recognise each language, served from the @tesseract.js-data packages.

  Downloaded on demand from cdn.jsdelivr.net

  Used in: Image to Text Converter (OCR)

  Source codeLicense text

• signature_pad

  MIT License

  Draws smooth signatures with a mouse, finger or pen on a canvas so they can be placed on a PDF.

  5.1.4 from cdn.jsdelivr.net

  Used in: Sign PDF

  Source codeLicense text

Used to build the site

Other outside code

Every page loads Google's tag (gtag.js) from www.googletagmanager.com for Google Analytics. It is Google's own proprietary code, provided under Google's terms, and it is not open source. Our Privacy Policy explains what it does and how your consent choice controls it.

ClickSolveTools code and content

Apart from the third-party libraries above, which stay under their own licenses, the ClickSolveTools website, including its code, tool implementations, design and written content, is proprietary to TPS Worldwide LLC. All rights reserved. See our Terms of Service for what you may and may not do.

Trademarks

Library names belong to their authors and are used here only to identify the software. Microsoft and Microsoft Word are trademarks of the Microsoft group of companies. QR Code is a registered trademark of DENSO WAVE INCORPORATED. Pomodoro Technique and Pomodoro are registered trademarks of Francesco Cirillo. Google and Google Analytics are trademarks of Google LLC. Other names are trademarks of their respective owners. ClickSolveTools is not affiliated with, endorsed by or sponsored by any of them.

Questions or corrections

If you maintain one of these libraries and would like the attribution changed, or you spot a mistake on this page, email support@tpsworldwidellc.net.