Where to Watch Demon Slayer Online for Free: Legal Streaming Options.

There are legal streaming platforms that you can use to watch Demon Slayer: Kimetsu no Yaiba online for free. Some of these platforms may offer a free trial period before requiring a subscription fee. Here are a few options:

1). Funimation - 

Funimation is a popular streaming service that specializes in anime. They have the rights to stream Demon Slayer: Kimetsu no Yaiba in the US, Canada, UK, Ireland, Australia, and New Zealand.

2). Crunchyroll - 

Crunchyroll is another popular streaming service that specializes in anime. They have the rights to stream Demon Slayer: Kimetsu no Yaiba in the US, Canada, UK, Ireland, Australia, and New Zealand.

3). AnimeLab - 

AnimeLab is a streaming service that specializes in anime and is available in Australia and New Zealand. They have the rights to stream Demon Slayer: Kimetsu no Yaiba.

4). Hulu - 

Hulu is a popular streaming service that offers a variety of content, including anime. They have the rights to stream Demon Slayer: Kimetsu no Yaiba in the US.

Note: The availability of Demon Slayer: Kimetsu no Yaiba may vary depending on your location and the streaming platform.