Converters online

https://www.online-convert.com

Free file converter of many formats. Powerful and convenient.
Choose Photos, Audio, Video, Archive, Document or e-book.
We choose a certain format in which you would like to format it.
We fall on a page where you can download our file and make additional settings if you want.
Click Convert file and after a while we get the result. You will have to wait, depending on the size of the file. I tried with the picture, so I did not have to wait.

https://www.zamzar.com

Online converter.
It is better to register, then you will be allowed to convert files up to 1 Gb in size and provide space for 100 Gb. While free, because the project is under testing.

Supported formats are www.zamzar.com/conversionTypes.php

https://toepub.com

The converter, the main feature is e-books.
Converts primarily PDF to UZGIB MOBI, AZW3, FB2, LIT, LRF.
But it works with many other formats:

PDF -> DOC
JPG -> PDF
PDF -> PNG
PDF -> JPG
PDF -> DOC
PNG -> JPEG
PDF -> ePub

And many others.

https://www.swiftconverter.com

Convert video, audio, pictures, documents and 3D.
Converted to another format or compressed.
The file size limit is 100 Mb.

How it works

1. select video, audio, images, files, or 3D.
2. drag and drop the file into the form field,
3. choose the format in which we want to convert,
4. click Convert.

https://feed43.com

RSS-stream for a web page.
The service allows anyone to make an RSS-feed from any page of the site.
From you no knowledge is required.
The site is in Russian, because there will be no difficulties at all.

https://www.youconvertit.com

It's good that we just upload your file to the server (Select it), and he determines in what formats he can convert it.
Say, if this is a picture, then we will offer graphic formats (JPEG, GIF, PNG, ...), etc.