DocsToAudio (https://docstoaudio.online/) converts pdf, epub, docx and txt files to MP3 or M4B audio with 300 AI voices in 50 languages available (13 French-speaking).

Works entirely in the browser, without installation or registration, in six steps: import the file, select chapters, refine the text, choose the voice and playback speed, convert, and then download.
The result is downloadable as a ZIP of individual MP3 files (one per chapter) or as a single M4B file with chapter markers.

Text extracted from the source file is transmitted to third-party text-to-speech services for audio generation.

Note: avoid texts with URLs, see example file.

Free, without an account and unlimited.

Source for the test: Artificial intelligence and education: research contributions and challenges for public policy