Lemon - Windows 0.4.0

Lemon for Windows 10 (2004 or later) and 11, 64-bit.

What's new in 0.4.0

• Commands. Your own PowerShell commands on a Commands ring, for dragged files (optionally only some types, like zip), folders and links. Set them up in Settings › Wheel › Commands: placeholders such as Folder, Files in Folder, File and Link show as colored chips and are quoted for you. Shake a project folder to open it in Terminal or VS Code (wt -d {folder}, code {folder}), or a link from the browser to hand it to your own tool. A folder dragged on its own opens straight on Commands. If a command fails, a notification shows what it printed. More in DETAIL.md.
• The welcome guide shows your real wheel, with your own Convert ring for pictures and your theme, and Windows' own file icons.
• Hints follow your settings. The empty queue and the tray icon's tooltip say how the wheel opens for you right now (shake, your key, or both).

Which file?

	Lemon-0.4.0-Setup.exe (recommended)	Lemon-0.4.0-Portable.exe
What it is	Installs Lemon for your user	One file you run from anywhere, nothing to install
Admin rights	Not needed	Not needed
Start menu entry and uninstaller	Yes	No
Right-click Convert with Lemon, start with Windows	Ticked in setup (or later in Settings)	In Settings
Remove-background AI models	Setup can download them	Downloaded in Settings

Both keep settings in %LOCALAPPDATA%\Lemon, so you can switch between them.

Install guide

Installer

1. Download Lemon-0.4.0-Setup.exe and run it.
2. If Windows says "Windows protected your PC", click More info › Run anyway (Lemon isn't code-signed yet; Windows only asks once).
3. Pick your options:
   • "Convert with Lemon" in the right-click menu: convert straight from File Explorer.
   • Start Lemon when I sign in: keeps the conversion wheel ready. The wheel only works while Lemon is running.
   • Download the AI model for Remove background: BiRefNet Lite (224 MB, recommended) is ticked; BiRefNet full quality (973 MB, needs more memory) is optional.
4. Finish, and Lemon starts. It installs to %LOCALAPPDATA%\Programs\Lemon.

Portable

1. Download Lemon-0.4.0-Portable.exe and put it where you like (e.g. Documents\Apps).
2. Double-click it (same SmartScreen note as above). The first launch takes about 2 s while it unpacks to %TEMP%\.net\Lemon; later launches are instant.
3. Optional, in Settings (gear, top right): the right-click menu, start with Windows, and Background remover models. These point at the file where it is now: if you move or rename it, switch them off and on again.

Check the download (optional)

Get-FileHash .\Lemon-0.4.0-Setup.exe -Algorithm SHA256

File	SHA-256
Lemon-0.4.0-Setup.exe	4ce8671875fa289458d8047ca52a15fa82ab64cb33dde361903f7eab55f37b0a
Lemon-0.4.0-Portable.exe	9116092e2e7ae983b12086d3810fd648d68370f74d6952145f9be579d654a671

First steps

• Batch: drop files or folders on the window (or Add files), pick a preset per file or Set all to, click Convert. Results are saved next to the originals (or a folder you choose in Settings › Output).
• Conversion wheel: while Lemon runs (minimized or in the tray is fine), drag files anywhere and shake the mouse or press Space. Drop on a format to convert right away, or on the lemon to queue. Switch rings with the chips under the wheel, Tab, the number keys or the scroll wheel.
• Wheel tab: look (themes, blur, opacity, center emoji), your own rings, the Convert ring per file kind, and where the wheel opens, with a live preview.
• Closing the window keeps Lemon in the notification area so the wheel keeps working; right-click the lemon by the clock to quit.

Optional tools

Images (PNG, JPEG, WebP, AVIF, GIF, TIFF, BMP, ICO, HEIC input, PDF output) work out of the box. For more, install these free tools; Lemon names the missing one when you add a file it can't convert, and finds tools without a restart.

For	Install (PowerShell)
Audio and video, Optimize for videos	winget install Gyan.FFmpeg
Documents (DOCX, ODT, RTF, HTML, Markdown, EPUB)	winget install JohnMacFarlane.Pandoc
Office files to PDF	winget install TheDocumentFoundation.LibreOffice
Optimize for PDFs	Ghostscript, from ghostscript.com

Updating and uninstalling

• Update: run a newer Setup over this one (quit Lemon first: right-click the lemon › Quit Lemon), or replace the portable file. Settings, presets and models are kept.
• Uninstall: Settings › Apps › Installed apps › Lemon › Uninstall (also removes the right-click menu and start with Windows). Portable: switch those two off in Lemon's Settings, quit, delete the file.
• Settings, presets and models stay in %LOCALAPPDATA%\Lemon; delete that folder to remove them too.

If something's off

• No wheel: make sure Lemon is running (lemon by the clock) and that shaking or a key is on in Settings › Conversion wheel. Drag actual files (or, with a command for links, a link).
• No Cut out ring: download a model in Settings › Background remover.
• A conversion failed: the error is on the file's row; details are in %LOCALAPPDATA%\Lemon\errors.log. Please attach it to an issue.