Light Copy Translator

Lightweight Windows copy-translate tool (WPF / .NET 10).

Motivation

CopyTranslator is convenient but it does not support LLM-based models and tends to be heavy on memory. This project aims to provide a lightweight alternative with modern LLM translation sources while keeping resource usage low and responsiveness high.

Features

• Double-press Ctrl+C to trigger the popup
• Auto-hide when you click outside; no Alt-Tab entry
• Two-column layout: source on the left, cards on the right
• Configurable model sources via Settings (name, apiKey, model, baseUrl)

Tutorial

1. Download the portable ZIP in the releases page and extract to any loc.
2. Run LightCopyTranslator.exe inside the extracted folder.
3. Right click the tray icon and open the setting, add your llm api key; recommand using openrouter, see config section.
4. Select the text and ctrl CC to enjoy the translation!

Build From Source

If you want to build from source:

1. Install .NET 10 SDK.
2. Open a terminal in this repo.
3. Run:

dotnet build src/LightCopyTranslator/LightCopyTranslator.csproj -c Release

The config file will be created at:

%APPDATA%\LightCopyTranslator\config.json

Config

This app uses OpenRouter for LLM translation. Follow these steps:

1. Go to OpenRouter and create an API key.
2. Run the app, right-click the tray icon, and open Settings.
3. Add a model entry (name, model, baseUrl).
4. Paste your OpenRouter API key into ApiKey (leave blank only if you already set OPENROUTER_API_KEY in Windows).
5. Click Save and try Ctrl+C twice to translate.

The config file is auto-created here:

%APPDATA%\LightCopyTranslator\config.json

If you are not sure what to fill:

• Name: DeepSeek
• Model: deepseek/deepseek-chat
• BaseUrl: https://openrouter.ai/api/v1

Model config example: config.sample.json.