You're looking for 'Mushoku Tensei' in a format that respects the author and translators, and there are a few clear paths for that. The primary official English publisher for the light novel series is Seven Seas Entertainment. They handle the physical volumes and the digital editions. For a purely digital read, you can purchase the e-books through major retailers like Amazon Kindle, Apple Books, Google Play Books, and Kobo. These platforms offer a straightforward buy-and-download model, letting you own the digital copy for offline reading.
Another excellent option is BookWalker, which specializes in light novels and manga. They have a global storefront and often run sales or offer point-back promotions. Reading through BookWalker supports the official release directly. For those who prefer a subscription model, services like J-Novel Club have serialized the web novel, which is the source material, but their premium membership also provides access to the light novel chapters as they are translated and edited. While not always the final polished light novel volume, it's a fantastic way to follow along with the official translation process.
It's worth checking if your local library offers digital lending through apps like Libby or Hoopla, as some libraries carry the Seven Seas digital editions. This is a fantastic zero-cost, fully legal way to access the series if you're patient with waitlists. The official translations ensure you get the nuanced character development and world-building that fan translations can sometimes miss, especially in later volumes where the terminology becomes more complex.