Since I don't like wasting my time, I'm not going to waste my readers' time either - I really hate pages where they tell you 500 words of pure fluff before getting to the point, for example, or those YouTube videos where they give you two minutes of rambling before getting to the real content. In both cases, you've already lost me after 100 words or 30 seconds of video.
So I'll just leave you with the information and you can add the flourishes.
Good afternoon!

Here I leave you with a discovery I made, literally, yesterday morning.
Converted.

I was looking for a way to convert audio files (mp4 to mp3) online, without having to download/install any software and as uncomplicated as possible.
And I came across this gem.

Convertio converts EVERYTHING you can think of and a couple of things more —according to them,

“We support over 25,600 different conversions between over 300 different file formats. More than any other converter. Converted It operates in the browser and works with all platforms. You don’t need to download or install any software.”

https://convertio.co/es/

I have already tried it for conversions of audio, video, and, of course, text files.

Audio and video, fast and with good quality everything.
In text, I was surprised by the quality of the conversion from PDF to Word, as it perfectly maintains the order of the graphics, headers and footers... And when I got to ebooks, the conversions between formats epub, mobile, and any other e-book format you can think of —yes, that also ☺—, no problem.
I was delighted.

Take a look and see for yourself.
You are welcome.