Oceandoc (https://oceandoc.com/) generates presentations from an instruction or document.

In the free version, unlimited presentations without AI image generation and up to 30 slides, 8 templates offered and generation from documents up to 2000 words (pdf, txt, doc, md).

Advanced editing for all elements, chatbot for improvement.
Export ppt, word or zip.

Even if French is offered, it is preferable to specify it in the instruction.