I have debian 11.0.0 (bullseye).

These two commands create ascii art file.
jp2a --output=jp2aout.txt imagein.jpeg;
asciiart imagein.jpeg > asciiartout.txt;

But I found that text format is not easily portable, diffrent people use diffrent text programs.

One solution is this command.
ansilove -o asciiart.PNG asciiartout.txt;

Are there other solutions? How to convert text to pdf?

Here are some packages I tried: abiword, calligrawords, simplyhtml, wordgrinder, wordgrinder-ncurses, golang-github-jung-kurt-gofpdf-dev, htmldoc, linuxdoc-tools-latex; page-crunch, pdfproctools, php-dompdf, pod2pdf, qpdf.
Sometimes the program breaks the text into pages.

On a minor side note, ansilove says File asciiartout.txt does not have a SAUCE record. I found documentation showing how to manually create a SAUCE record. Is there an automatic way? And does anyone even use it?

Have you tried https://github.com/baruchel/txt2pdf? By default, it will break the output into pages as well, but you can specify --minimum-page-length as an option.

Thank you shruggy Senior Member.
I ran this code: git clone git://github.com/baruchel/txt2pdf
I got this file: txt2pdf/txt2pdf.py
I ran this code: python txt2pdf/txt2pdf.py --minimum-page-length 100 -o asciiart.pdf asciiart.txt
I got this file: asciiart.pdf
word wrap occurs, but I can play with the margin switch. It looks like this will do the job. I wonder why it is not in debian. Is there something in the debian repository that will work? I found other website https://sanface.com/txt2pdf.html that has propiatery txt2pdf for sale.

I guess some combination of Ghostscript options may work. Ghostscript comes with a PostScript utility gslp.ps (as well as a shell script /usr/bin/gslp that uses it). gslp.ps understands some switches of enscript including -L.

Alternatively, you can use enscript to convert the text file to PostScript, then convert the result to PDF.