The story's all over the place online, which is kind of neat. Gutenberg.org is my usual first stop for stuff like this; they've got the Madame de Villeneuve original and the more common Beaumont abridged version, both in the public domain. It's a clean, no-fuss read without any weird pop-ups. Sometimes the older text feels a little stiff, but I like seeing the extra subplots cut from the Disney version, like the evil sisters trying to sabotage Beauty.
If you want something more curated, SurLaLuneFairyTales.com has an annotated version that's super interesting. They break down the symbolism and history in little side notes. For a quick, modern English version, WorldofTales.com works fine, though the site design is a bit of a throwback. Honestly, just reading both Villeneuve and Beaumont back-to-back online shows how much a story can evolve even before Hollywood gets it.