Here are some popular tools to convert images or screenshots to ASCII art:

1. jp2a

   • A command-line tool for converting JPEG images to ASCII art. It's lightweight and customizable with various options for size and color.
   • Installation: sudo apt install jp2a (Debian/Ubuntu) or from source.

2. ImageMagick + Text Mode

   • ImageMagick can manipulate images in various ways, and it has a text mode for ASCII conversion.

3. Aasciinator

   • An online tool that allows you to upload an image and convert it to ASCII. Simple and user-friendly.

4. Pillow (Python Library)

   • A Python library for image processing that can be combined with custom scripts to create ASCII art.
   • Example: Use Pillow to manipulate the image and curses for ASCII output.

5. ASCII Art Studio (Windows)

   • A dedicated tool for creating and converting images into ASCII art.

These tools offer flexibility depending on your platform and customization needs.