Direct answer
Use Apple Translate for a few selectable paragraphs, Live Text for image-only pages, and an aligned PDF translator for long course documents.
If the words can be selected, copy them from Preview and translate them with Apple Translate or use the Translate action where the app supports it. If the page is a scan, use Live Text on an image of that page. If you need to keep reading, annotating, and asking questions across many pages, use a PDF workspace such as BBNotes that keeps the original and translation together.
Choose first
Is the text selectable?
Open the PDF in Preview and touch and hold a word. If selection handles appear, the PDF has a usable text layer. If the whole page behaves like one image, treat it as a scanned PDF and use OCR or Live Text.
One paragraph: use the system tools. One scanned page: use Live Text. A full lecture deck or paper that you need to study in two languages: use a bilingual PDF workflow.
Method 1 · Selectable text
Copy a passage from Preview and translate it
Best for a few paragraphs
- Open the PDF in Preview on iPad.
- Touch and hold the first word, then adjust the selection handles.
- Use Translate if the current app exposes the action; otherwise copy the text into Apple Translate.
- Download both languages first if you need Apple’s translation to work offline.
Fast, but the translation leaves the page
- No extra study app is required.
- Useful for definitions, emails, and short quotations.
- Repeated copy and paste becomes slow across a long PDF.
- The original page, translation, handwriting, and follow-up questions are not kept in one view.
Apple documents both translating selected text in supported apps and selecting text from a PDF in Preview. Available actions and languages can vary by app, OS version, and region.
Method 2 · Scanned page
Use Live Text when the PDF page is an image
Best for one or two scanned pages
- Export or capture the relevant page as an image.
- Open the image in Photos on a supported iPad.
- Tap the Detect Text button, select the recognised text, then choose Translate.
- Check names, formulas, tables, and line breaks against the scan.
OCR makes the page usable, not perfect
- Works when the PDF has no selectable text layer.
- Recognition quality depends on image resolution and layout.
- Handwriting, equations, footnotes, and multi-column pages are harder.
- It is inefficient when every page requires a separate capture.
Apple’s Live Text support guide lists compatible devices and explains how to translate recognised text from photos and images. Language and regional availability still apply.
Method 3 · Long course PDF
Keep the source and translation aligned while you study
For lecture slides, readings, and papers, the main problem is usually not producing one translation. It is keeping the source, translation, handwriting, and questions connected while moving through the document.
Translate the page or a selected region
- Import the PDF into BBNotes.
- Open the translation drawer on the page you are reading.
- Translate the current page, selected text, or a drawn region.
- Scroll with the source and translation kept together.
- Annotate the page or circle a difficult point to ask the AI tutor.
What to check before using it
- Requires iOS/iPadOS 17 or later and an internet connection for AI translation.
- Requires explicit AI Data Sharing permission.
- Scanned and image-heavy pages use OCR fallback, so clarity matters.
- AI translation can misread formulas, diagrams, or ambiguous academic language.
Comparison
Which method fits the task?
| Method | Best for | Main advantage | Main limitation |
|---|---|---|---|
| Apple Translate | A few selectable sentences or paragraphs | Built into the system and can use downloaded languages offline | Repeated copying breaks the reading workflow |
| Live Text | A photo or isolated scanned page | Recognises text when no PDF text layer exists | Accuracy and device support vary; page-by-page work is slow |
| BBNotes aligned translation | Lecture decks, papers, and long study PDFs | Original, translation, handwriting, and AI questions stay connected | Requires internet, AI permission, and available AI usage |
Accuracy checklist
Check the parts translation tools commonly miss
- Course-specific terminology and abbreviations.
- Negatives, qualifiers, and words such as “may,” “must,” and “except.”
- Formula symbols, subscripts, superscripts, and units.
- Labels embedded inside diagrams and charts.
- References split across columns, headers, or footnotes.
- Names and citations that should not be translated.
Use the translation to understand the source, then cite and verify the original. Do not cite an AI translation as though it were the original author’s wording.
Sources and testing note
How this guide was verified
System steps were checked against Apple’s current iPad support documentation. BBNotes requirements and limits were checked against its published App Store listing, current privacy policy, product footage, and the versioned compatibility and limitations page. The guide content was last reviewed on 27 August 2026; the UK App Store version reference was checked on 11 September 2026.
For the long-document workflow
Keep both languages beside the page you are studying.
Download BBNotes free and test the workflow on one real lecture PDF before deciding whether it fits your course.