A lightweight Windows app that converts MOBI files to EPUB and sends them directly to your Kindle. No Calibre, no email workarounds - just drag and drop.
- MOBI to EPUB conversion - Converts Kindle MOBI files to standard EPUB format
- Direct Send to Kindle - Native integration with Amazon's Send to Kindle service
- EPUB passthrough - Drop EPUB files to send them directly without conversion
- Batch processing - Convert and send multiple books at once
- Metadata editing - Edit title and author before conversion
- Explorer integration - Right-click context menu for quick access
- Dark theme - Easy on the eyes
Download the latest installer from the Releases page.
Note: Windows SmartScreen may show an "Unknown Publisher" warning because the app isn't code-signed. Click "More info" → "Run anyway" to install.
Or build from source (see below).
- Drag and drop a MOBI or EPUB file onto the window (or click to browse)
- Edit metadata if needed (title, author)
- Convert (MOBI only) - choose where to save the EPUB
- Send to Kindle - requires one-time Amazon login
After installation, right-click any .mobi or .epub file in Explorer:
.epub→ "Send to Kindle with Booky".mobi→ "Convert & Send to Kindle with Booky"
On Windows 11, these appear under "Show more options"
- .NET 8 SDK
- Windows 10/11
# Debug build
dotnet build Booky.csproj
# Release build (single file)
dotnet publish Booky.csproj -c Release -r win-x64 --self-contained true -p:PublishSingleFile=true -o publish
# Copy tools
cp -r Tools publish/Requires Inno Setup 6:
"%LOCALAPPDATA%\Programs\Inno Setup 6\ISCC.exe" installer.issOutput: installer/BookySetup.exe
Booky uses the following open source libraries:
| Library | License | Purpose |
|---|---|---|
| libmobi | LGPL-3.0 | MOBI file parsing and conversion |
| HtmlAgilityPack | MIT | HTML parsing for EPUB generation |
| WebView2 | BSD | Amazon login integration |
The libmobi license is included in Tools/COPYING.libmobi.
- Windows only (WPF application)
- DRM-protected files are not supported
- Send to Kindle requires an Amazon account
MIT License - see LICENSE
If Booky saves you time, consider buying me a coffee.
Made by VoidMind