One top pick is the PDF Translator & Editor. It can convert many file formats, including PDF, Word, Excel, PowerPoint and photos, into 136 languages while preserving formatting and layout. It uses Google and Microsoft's Neural Machine Translation models for high-quality translations and offers flexible PDF conversion and editing abilities. It's good for people who have multilingual documents with complex formatting requirements.
Another option is O.Translator. This AI-powered document translation tool works with more than 60 languages and with several file formats, including PDF, DOCX, XLSX and more. It's got a context-aware translation engine, relatively low prices, easy integration with programming interfaces and private encrypted storage. O.Translator prioritizes data security, regularly deleting translation files after 10 days, so your documents are protected while they're being translated.
If you want a collection of tools, check out Mojju. Although it has a range of AI-powered tools in other categories, including a Universal File Convertor, it's got a lot of utility for converting and translating many file formats into many languages. Mojju's tools are designed to be easy to use, and they can be customized for both technical and nontechnical people, so it's good for a variety of workflows.