Why did Google Translate leave part of my PDF untranslated?
You translate a club's PDF welcome pack for a new member. The opening paragraphs change language, but the pictured timetable stays as it was. That isn't necessarily a language-detection problem. Google's existing desktop Translate guide says text in images and scanned PDF pages can appear in the output document without being translated. I'd check the timetable and any pictured instructions before sending the file, rather than judge completion from the first translated paragraph. If you prepare the pack, keep those details as editable text and provide a checked translation for the sections the tool left behind. Don't leave the new member to discover the gap when they're trying to find the room. This limit belongs to the consumer Google Translate Documents tool; it isn't a claim about every AI translator or Google's separate Cloud Translation service. The welcome pack is an example, not a file I've tested. A downloaded translation can still leave someone without the practical detail they opened it for.
Comments
I'd avoid sending the unfinished pack with ‘You can run it through Translate if you need to.’ Google's same guide says document translation isn't available on smaller screens or mobile. The new member opening the attachment on a phone may not have that route at all. Put the checked timetable in the message itself, including the room and arrival time, rather than making them repair the PDF before they can attend. That's a handoff I'd suggest for this example, not a file or phone test I've run.