I know the craving for a good free romance novel you can take anywhere without Wi-Fi. The whole offline thing really changes the game, especially for long commutes or when you're trying to disconnect.
My absolute top recommendation for this is your local library's digital service, like Libby or Overdrive. You check out the ebook or audiobook for free, download it through their app, and it's yours until the loan expires. The selection is massive, with tons of popular and indie romance titles. The catch is you sometimes have to wait on holds for the newest stuff, but I've found so many gems I wouldn't have picked up otherwise just browsing the 'available now' section. It feels less risky trying a new subgenre when it doesn't cost anything.
Beyond that, sites like Project Gutenberg are a goldmine for classic romance novels that are in the public domain. We're talking authors like Georgette Heyer, Jane Austen, or early 20th-century pulp romances. The files are usually ePub or Kindle formats, so you can download them directly to your device. It's a different vibe from contemporary romance, but sometimes that historical or regency slow burn hits the spot. For more modern picks, some authors and publishers run limited-time promotions where they make the first book in a series free on major retailers like Amazon or Kobo to hook readers; you just need to download it during the promo period and it's permanently in your library. I have a whole folder of 'free firsts' I've collected over the years.
What you want to avoid are those random blogs offering direct downloads of clearly copyrighted new releases—that's just piracy, and it's shady. Stick to the library model or official publisher promotions, and you can build a solid offline collection without the guilt or the malware risk. My Kindle is packed with free romance downloads from these methods, and it honestly saves me a fortune.