Open-source licenses
Last updated: October 30, 2026
Filoshi does its work with open-source programs. They ship inside the app, run on your PC, and are used unmodified. Thank you to everyone who builds them. This page lists what ships with Filoshi 2.0.0 for Windows and what filoshi.com runs in your browser. The app shows the same list, with the license texts, in Settings → Open-source licenses.
1. Engines inside the app
| Component | Version as shipped | License | License text |
|---|---|---|---|
| FFmpeg Video and audio conversions. Runs as a separate program (ffmpeg.exe). | 8.0.1 (gyan.dev full_build, static, unmodified) | GPL 3.0 | License and notice, Libraries in this build |
| ImageMagick Image conversions, including camera RAW, HEIC and AVIF. Runs as a separate program (magick.exe). | 7.1.2-21 Q16 x64 portable (unmodified) | ImageMagick License | License, Libraries inside (NOTICE) |
| Pandoc Document conversions: Word, Markdown, HTML, EPUB and more. Runs as a separate program (pandoc.exe). | 3.6.2 (official Windows x86_64 release, unmodified) | GPL 2.0 or later | License and notice |
| 7-Zip Archive extraction and compression. Runs as a separate program (7z.exe). | 23.01 x64 (7z.exe and 7z.dll from the official installer, unmodified) | LGPL 2.1 or later, BSD 3-clause, unRAR restriction | License and notice |
| PDFium Shows, edits and saves PDF files. A library (pdfium.dll) that Filoshi loads. | 150.0.7834.0 (chromium/7834, pdfium-binaries by Benoit Blanchon, unmodified) | BSD 3-clause and Apache 2.0 | Licenses (PDFium and its third-party code) |
| pdfcpu PDF page and file tools in the PDF Suite and PDF conversions. Runs as a separate program (pdfcpu.exe). | 0.11.1 (official Windows x86_64 release, unmodified) | Apache 2.0 | License (pdfcpu and its Go modules) |
The folders of FFmpeg and Pandoc also hold the Microsoft Visual C++ runtime DLLs (version 14.44), redistributed under Microsoft’s terms for those files. They are not open source.
2. Fonts inside the app and on this site
3. Optional add-ons
The app downloads these from Filoshi's GitHub releases only when you ask for them (Settings → Add-ons).
| Component | Version as shipped | License | License text |
|---|---|---|---|
| LibreOffice (add-on) Office documents. Downloaded only when you ask for it. | 25.2.3.2 (LibreOffice Portable 25.2.3 for Windows) | MPL 2.0 (much of it also LGPL 3.0+) | Inside the add-on; licenses |
| FreeCAD (add-on) 3D models and CAD. Downloaded only when you ask for it. | 1.0.2 (FreeCAD Portable for Windows) | LGPL 2.0 or later | Inside the add-on; license |
4. Credits
- FFmpeg: This software uses code of FFmpeg (https://ffmpeg.org), licensed under the GPLv3. Copyright (c) 2000-2025 the FFmpeg developers. The build also contains x264, x265 and the other libraries listed in its notes, each under its own license.
- ImageMagick: Filoshi uses ImageMagick software, Copyright (C) 1999 ImageMagick Studio LLC (https://imagemagick.org). ImageMagick is a trademark of ImageMagick Studio LLC, which does not endorse Filoshi. Some of the libraries compiled into it (cairo, libcroco, fribidi, gdk-pixbuf, glib, libheif, libde265, liblqr, pango, libraw, librsvg) are under the GNU LGPL.
- Pandoc: Pandoc, Copyright (C) 2006-2024 John MacFarlane and contributors, licensed under the GNU GPL version 2 or later.
- 7-Zip: 7-Zip Copyright (C) 1999-2023 Igor Pavlov, licensed under the GNU LGPL. LZFSE decompression: Copyright (c) 2015-2016 Apple Inc., BSD 3-clause License. The RAR decoder was developed using source code of unRAR (copyright Alexander Roshal); that code may not be used to re-create the RAR compression algorithm, which is proprietary.
- PDFium: PDFium, Copyright 2014 The PDFium Authors. pdfium-binaries, Copyright 2014-2025 Benoit Blanchon (MIT). It contains FreeType, ICU, Little CMS, libjpeg-turbo, OpenJPEG, libpng, libtiff, zlib, Abseil, fast_float, simdutf, Anti-Grain Geometry and LLVM libc code, each under the license in the text.
- pdfcpu: pdfcpu, Copyright The pdfcpu Authors, licensed under the Apache License 2.0. Built with Go (Copyright The Go Authors, BSD 3-clause) and the Go modules listed in its license file.
- Bricolage Grotesque: Copyright 2022 The Bricolage Grotesque Project Authors.
- Geist and Geist Mono: Copyright 2024 The Geist Project Authors.
- LibreOffice (add-on): LibreOffice is made by The Document Foundation and contributors. Its license texts ship inside the add-on.
- FreeCAD (add-on): FreeCAD is made by the FreeCAD project and contributors. Its license texts ship inside the add-on.
5. Source code
Every component above is used as its authors or builders released it. Here is where each one's source lives:
- FFmpeg: FFmpeg 8.0.1 source, the build (gyan.dev 8.0.1), build notes.
- ImageMagick: ImageMagick 7.1.2-21 source, Windows build files.
- Pandoc: Pandoc 3.6.2 release, source package.
- 7-Zip: 7-Zip 23.01 source, the installer we unpack.
- PDFium: PDFium chromium/7834, the build.
- pdfcpu: pdfcpu 0.11.1 release.
- Bricolage Grotesque: source.
- Geist and Geist Mono: source.
- LibreOffice (add-on): licenses, LibreOffice 25.2.3.2 source, LibreOffice Portable.
- FreeCAD (add-on): FreeCAD 1.0.2 source, license.
Written offer. Some components are under licenses that ask whoever distributes them to make their source code available: FFmpeg, ImageMagick, Pandoc, 7-Zip, LibreOffice, FreeCAD (the GNU GPL and LGPL, and the MPL). For those, Synvor offers to give anyone who has a copy of Filoshi the complete corresponding source code, as those licenses define it, of the exact versions we ship: the source of each program, of the libraries compiled into it, and the scripts used to build it.
- How to ask: email support@filoshi.com with the component and the Filoshi version (Settings → About shows it).
- How you get it: a download link, free of charge. If you prefer a physical copy, we send it on a storage medium for no more than our cost of doing so.
- How long: for at least three years after we last distribute that version of Filoshi or its add-on, and in any case until at least October 27, 2029 (three years after Filoshi 2.0.0 was released on October 27, 2026).
You can also get each program from its own project at the links above. Those licenses let you copy, change and share these programs under their terms; nothing in Filoshi's own license limits those rights.
6. On filoshi.com
The website uses this open-source software in your browser:
libheif and libde265 (through libheif-js 1.23.5)
Opens HEIC and HEIF photos in the free try on the homepage and the /convert pages. It runs in your browser and is loaded, as a separate, unmodified file served by filoshi.com, only when you try a HEIC or HEIF photo.
License: LGPL 3.0. License and notice.
Source code: libheif, libde265, libheif-js 1.23.5.
ffmpeg.wasm (@ffmpeg/ffmpeg 0.12.15, @ffmpeg/core 0.12.6)
Converts audio and video (and GIF to video) in the free try on the homepage and the /convert pages. The WebAssembly core is loaded by your browser from unpkg.com, only when you give the try an audio file or a video.
License: MIT (the JavaScript); GPL 2.0 or later (the core, built with x264 and x265). License and notice.
Source code: ffmpeg.wasm 0.12.6, FFmpeg.
pdf.js (pdfjs-dist 5.7.284)
Draws the first page of a PDF as a picture in the free try. It runs in your browser and is loaded, as separate, unmodified files served by filoshi.com, only when you give the try a PDF. It comes with the Foxit and Liberation standard fonts and the OpenJPEG, JBIG2 and qcms decoders.
License: Apache 2.0 (pdf.js); the fonts and decoders under their own licenses, listed in the notice. License and notice.
Source code: pdf.js, pdfjs-dist 5.7.284.
The site's fonts are the ones in section 2.
Patents on video and audio formats are a separate question from these licenses: see Codec licensing.