Mate for iOS, macOS, and Chrome let you translate selected text in PDF files. You can't upload a PDF file to Mate and get a translated document back. However, you can select words and sentences and get them translated right there in a near popup window.
Please note that if you're using Mate's extension for Firefox, Edge or Opera, you can't translate selected text in a PDF file opened in the browser. Unfortunately, there's no technical way to implement it. If those browser ever give us access to their PDF viewers, we'll implement it ASAP.
Here are the tutorials on how to use different Mate apps and extensions with PDFs:
- Translate in PDF files with Mate's Mac app
- Translate in PDF files with Mate's iOS app
- Translate in PDF files with Mate's Chrome extension