Open-source licenses
The file converters and PDF tools on CalcBrew are built on open-source software. Libraries that run in your browser are delivered to your device as separate files; the copyright notices and licenses below apply to them. Server-side conversions run unmodified open-source tools on our own server. We are grateful to all of these projects.
In your browser
| pdf-lib (@cantoo/pdf-lib) | MIT |
| PDF.js (pdfjs-dist) | Apache-2.0 |
| jsPDF + jspdf-autotable | MIT |
| heic-to (libheif, libde265) | LGPL-3.0 — WebAssembly module loaded as a separate file |
| jSquash AVIF / WebP (libavif, libwebp) | Apache-2.0 / BSD |
| pica | MIT |
| UPNG.js | MIT |
| UTIF.js | MIT |
| gifenc | MIT |
| gifuct-js | MIT |
| SheetJS Community Edition | Apache-2.0 |
| PapaParse | MIT |
| mammoth.js | BSD-2-Clause |
| marked | MIT |
| Turndown | MIT |
| fflate | MIT |
| fonteditor-core (incl. Google WOFF2) | MIT / Apache-2.0 |
| Mediabunny + MP3 encoder (LAME) | MPL-2.0 / LGPL-2.0 (LAME) — WebAssembly module loaded as a separate file |
| Tesseract.js (Tesseract OCR) | Apache-2.0 |
On our server
| LibreOffice | MPL-2.0 |
| Gotenberg (Chromium, LibreOffice) | MIT |
| FFmpeg | LGPL-2.1 / GPL-2.0 |
| qpdf and pikepdf | Apache-2.0 / MPL-2.0 |
| Tesseract OCR | Apache-2.0 |
| pdfplumber, pypdfium2, python-docx, openpyxl, python-pptx, Pillow | MIT / Apache-2.0 / BSD / HPND |
| Calibre | GPL-3.0 |
| libarchive (bsdtar), 7-Zip | BSD / LGPL |
| libvips, LibRaw, ImageMagick | LGPL-2.1 / LGPL-2.1 or CDDL / ImageMagick |
LGPL components (HEIC decoding, LAME MP3 encoding) are loaded as separate WebAssembly files and can be replaced by the user; their source is available from the linked projects. Trademarks belong to their owners; CalcBrew is not affiliated with Adobe, Microsoft, Apple or Google.