Image to ASCII, by Asciinova, converts any photo into art made of text characters. You upload a JPG, PNG or WebP image, and the conversion happens on your own device, so nothing needs to be sent to a server.
You can choose from many character sets and render modes, including colour and Braille, and adjust the level of detail. Exports as PNG, SVG or plain text are free with no signup. The only paid part is AI generation of new images.