I have a subscription for a convertor because I didn't find any of them free. I don't use it as much, but it's 7.99 per month so, not that expensive. For editing my PDF documents though, I use
https://pdfliner.com/1040_form, and it's free, so it's even better. I used to convert ete files to pdf a lot back in the day when I was a student, and as much as I remember, there were some free options, but I guess they're not available anymore. I might be mistaken, but I could find only paid applications online. If you have any free options to share, please do so.