Open-source licenses
Acorn Toolkit is built on excellent open-source software. We are grateful to the authors and communities behind these projects. The main components are listed below; the full third-party notices include the complete license text of every package delivered to your browser.
| Component | Used for | License |
|---|---|---|
| PDF.js | Reading and rendering PDF pages | Apache-2.0 |
| pdf-lib | Creating and editing PDFs | MIT |
| qpdf | Protect PDF and Unlock PDF (encryption) | Apache-2.0 |
| Tesseract.js | Image to Text (OCR) | Apache-2.0 |
| heic2any | HEIC to JPG | MIT |
| libheif | HEIC decoding (inside heic2any) | LGPL-3.0 |
| browser-image-compression | Compress Image | MIT |
| JSZip | Downloading several files as a ZIP | MIT (dual-licensed MIT / GPL-3.0; used under MIT) |
| node-qrcode | QR Code Generator | MIT |
| Lucide | Tool icons | ISC |
| Dancing Script | Typed signatures in Sign PDF | SIL Open Font License 1.1 |
| Next.js and React | Website framework | MIT |
About libheif (LGPL-3.0)
The HEIC to JPG tool uses libheif, licensed under the GNU Lesser General Public License v3.0. It is used unmodified and loaded as a separate file only when you use that tool. Its source code is available at github.com/strukturag/libheif.
Our own content
All page text, tool guides, the Acorn Toolkit name and acorn logo, and the tool icon designs are original work of Acorn Toolkit. Icon glyphs are from Lucide (ISC license).