How can I convert a low-quality image to high-quality without watermark?

kongyo2x is an open-source image upscaling tool, but it is not a typical PC application with a graphical interface. It's a technical tool designed for developers who are comfortable using the command line.

If you are a developer or are willing to use a command-line interface, kongyo2x is a powerful way to learn how to convert a low-quality image to high-quality. It uses AI models (MLPconv networks) trained specifically for super-resolution and can denoise images as part of the upscaling process.

Here’s what you need to know to use kongyo2x:

1. Installation and Requirements: It's installed via the Node Package Manager (npm). You must have Node.js 20 or newer installed on your system.
2. Command-Line Interface (CLI): You upscale images by running a command in your terminal, like npx kongyo2x -i input.png -o output.png -s 2. The -s flag controls the scale factor (e.g., 2 for 2x upscaling).
3. Advanced Features: It supports a higher-quality model (--variant hq), batch processing with different models, and can run in a CPU mode if you don't have a compatible GPU.
4. Security: A security scan shows that the package itself has no known direct vulnerabilities.

While kongyo2x provides a genuinely free and complex method to learn how to convert a low-quality image to high-quality, it is not a "one-click" solution. For most Windows users who want a simpler experience, tools are more user-friendly and widely recommended.