Choose the image file that you want to convert to text and characters. The larger your source image is, the more detail will be possible in the final ASCII image.
Go to an ASCII image generator on the Internet. Follow the instructions for uploading your image to the website, noting which file types are acceptable to use as your source image. It may be necessary for the image to have its own uniform resource locator (URL), the address of the image on the Internet. If this is the case, you will first need to upload the image to a photo-sharing website such as Facebook or Photobucket.
Adjust the settings that are available on the ASCII generator of your choice. Various settings may allow for changes in the size and detail of the final image. Dome ASCII generators allow you to change the primary color or the size of the font used in the image. Consider how you will be using the final image when deciding which settings to use.
Experiment with different settings or using different ASCII generators if the final image is not to your liking.