I’ve explored quite a few free tools for reading PDFs aloud. One of my go-to options is 'NaturalReader,' which has a decent free version with natural-sounding voices. It’s great for listening to textbooks or articles while doing chores. Another solid pick is 'Balabolka,' which lets you save the audio output, a feature not all free tools offer.
For browser-based solutions, 'Speechify' works well with Google Drive, and its free tier is surprisingly robust. If you’re on Windows, the built-in 'Narrator' feature can read PDFs if you open them in Edge. For Mac users, 'VoiceOver' is a built-in option, though it takes some getting used to. These tools have saved me so much time, especially when I’m too tired to read but still need to absorb information.