No. There is no account, no sign-up, no extension and no app. Paste a link and the tool works.
Is there a watermark or a size limit?
No watermark, and no artificial cap. The practical limit is your own device: the file is assembled in your browser, so a very long video needs enough free memory to hold it.
Why is it slower than other downloaders?
Because it is actually fetching the video. Dailymotion serves hundreds of small pieces rather than one file, and they all have to arrive before a single MP4 exists. Tools that appear instant are usually handing you a link to somewhere else.
Do you keep the videos?
No. The pieces pass through and are not written to disk. The finished file is created in your browser and is never uploaded anywhere.
Can it download private or paid videos?
No. It can only read what Dailymotion would serve to an ordinary viewer. Password-protected and geo-restricted videos are refused, and you are told which it was.
Which formats can I get?
MP4 for video, at any quality Dailymotion offers for that video — often 380p, 480p, 720p and 1080p. MP3 if you only want the sound.