Open Source Licenses
KolayDönüştür was not built from scratch — it stands on the work of the open source community. Below is the complete list of the 1418 open source packages we use — name, version, license and copyright holder. Our thanks to every one of their authors.
📊 Most Common License Types
| Package | Version | License | Owner / Publisher | Source |
|---|---|---|---|---|
| ws | 7.5.10 | MIT | Einar Otto Stangvik | GitHub |
| ws | 8.18.3 | MIT | Einar Otto Stangvik | GitHub |
| xlsx | 0.18.5 | Apache-2.0 | sheetjs | GitHub |
| xml-name-validator | 5.0.0 | Apache-2.0 | Domenic Denicola | GitHub |
| xml-naming | 0.1.0 | MIT | Amit Gupta | GitHub |
| xmlbuilder | 10.1.1 | MIT | Ozgur Ozcitak | GitHub |
| xmlchars | 2.2.0 | MIT | Louis-Dominique Dubeau | GitHub |
| xtend | 4.0.2 | MIT | Raynos | GitHub |
| y18n | 4.0.3 | ISC | Ben Coe | GitHub |
| yallist | 3.1.1 | ISC | Isaac Z. Schlueter | GitHub |
| yargs-parser | 18.1.3 | ISC | Ben Coe | GitHub |
| yargs | 15.4.1 | MIT | — | GitHub |
| yn | 3.1.1 | MIT | Sindre Sorhus | GitHub |
| yocto-queue | 0.1.0 | MIT | Sindre Sorhus | GitHub |
| yoctocolors | 2.1.2 | MIT | Sindre Sorhus | GitHub |
| youtube-transcript | 1.3.1 | MIT | Kakulukian | GitHub |
| zlibjs | 0.3.1 | MIT | Yuta Imaya | GitHub |
| zod | 4.4.3 | MIT | Colin McDonnell | GitHub |
📎 Special Attributions
- Browser compatibility data: caniuse.com (CC BY 4.0) — thanks to Alexis Deveria and contributors.
- Noto Sans Font Family: Google Noto Fonts (SIL OFL 1.1) — Google and contributors.
- OCRmyPDF: OCRmyPDF (MPL-2.0) — Tesseract-based OCR engine.
- PDF processing stack (AGPL-free, 24 May 2026): pdf-lib (MIT), pdfjs-dist (Apache 2.0), sharp (Apache 2.0), @hyzyla/pdfium (MIT) — Google PDFium WebAssembly sarmalayıcısı (Apache 2.0), @napi-rs/canvas (MIT), tesseract.js (Apache 2.0), qpdf (Apache 2.0). Önceki AGPL bağımlılığı (Ghostscript) bu tarihte tamamen kaldırılmıştır.
- CBRT EVDS data: Central Bank of the Republic of Türkiye (public domain).
- Open-Meteo hava verisi: open-meteo.com (CC BY 4.0).
🧩 Engines delivered to your browser
Some tools process your file inside your browser using the open-source engines below, without uploading it. These engines are served unmodified, under their own licenses.
- FFmpeg (ffmpeg.wasm core, v0.12) — video/audio tools. GPL-2.0-or-later build (x264 and x265 GPL-2.0+, LAME and FriBidi LGPL, other components under their own licenses). Build configuration:
--enable-gpl --enable-libx264 --enable-libx265 --enable-libvpx --enable-libmp3lame. Source code: github.com/ffmpegwasm/ffmpeg.wasm and ffmpeg.org/download.html. To request a copy of the corresponding source code under the GPL: [email protected]. - Whisper (OpenAI, MIT) — speech-to-text; Xenova/whisper-base ONNX model (MIT) and Transformers.js (Apache-2.0).
- ISNet general-use / DIS (Apache-2.0) — background removal (ONNX model).
- ONNX Runtime Web (MIT) — runtime that executes the AI models in the browser.
- Tesseract OCR — tesseract.js and tesseract.js-core (Apache-2.0), language data tessdata_best (Apache-2.0).
🖥️ Tools running as separate programs on our servers
The open-source programs below run on our servers as separate processes, unmodified and not distributed.
- Poppler (pdftotext, pdftoppm — GPL-2.0/3.0) — PDF text and image extraction.
- Ghostscript (AGPL-3.0) — inside OCRmyPDF, only for producing OCR output.
- unpaper (GPL-2.0+) — scanned page cleanup.
- LibreOffice (MPL-2.0) — office document conversion.
- qpdf (Apache-2.0), Tesseract (Apache-2.0).
🛡️ Our License Policy
KolayDönüştür is a commercial, closed-source web service. Our own code’s npm dependencies do not include AGPL, SSPL or CC-BY-NC packages. Every PR automatically runs npm run license:check as a risk scan; if AGPL/SSPL/CC-BY-NC is detected the build fails. Our npm dependencies are under MIT, Apache 2.0, BSD, ISC or similarly commercial-friendly licenses. The separate programs and browser engines listed in the cards above (including FFmpeg) are subject to their own licenses; we use them unmodified, as programs separate from our code.