Yes, it's absolutely free to use. No word or character limits and no subscription charges. Also, you don't need to signup or login to access it.
No, the file upload feature is not available at the moment. So, you have to open the file in Notepad or Microsoft Word and simply copy and paste it here.
You can count an infinite number of words or characters. It will never show the limit while using the tool.
No, there is no autosave facility available at the moment. If you want to save your entered data, you can copy and save it on your local computer or device. Also, you can use the Notepad Online to save your content in a text file.