There are hundreds of "annotate PDF on iPad" tutorials, but they all miss three practical problems:
| Feature | PDF Agile (Win + iPad share) | GoodNotes | Notability | Apple Files (Free) |
|---|---|---|---|---|
| Apple Pencil support | ✓ Win only | ✓ Full | ✓ Full | ✓ Basic |
| Annotations embedded in PDF | ✓ Yes | ✗ App-only | ✗ App-only | ✓ Yes |
| Cross-device visibility | ✓ Any PDF viewer | ✗ GoodNotes only | ✗ Notability only | ✓ Any viewer |
| Export highlights to TXT | ✓ Yes | ✗ No | ✗ No | ✗ No |
| Multi-color highlighting | ✓ 5 colors | ✓ Yes | ✓ Yes | ✓ 5 colors |
| Price | ✓ Free | ✓ $8.99 | ✓ $11.99/yr | ✓ Free |
Key insight: GoodNotes and Notability are great for iPad annotation, but their annotations are stored inside the app — not in the PDF file itself. When you share the PDF, recipients see a clean copy without your notes. PDF Agile embeds annotations directly into the PDF, so they're visible on any device.
The fastest way to annotate a PDF on iPad — no app download needed:
Open the Files app on your iPad. Find your PDF (in iCloud Drive, Downloads, or any folder).
Tap the PDF to open it. Tap the markup icon (pen in a circle) at the top right.
Select the Highlight tool (marker icon) — pick a color and drag across text. Or use the Pen tool with Apple Pencil for freehand annotations.
Tap Done — annotations are saved directly into the PDF file. Share it via email or AirDrop and recipients see your annotations.
Limitation: The Files app supports basic highlighting and drawing, but doesn't offer sticky notes, stamps, or export to TXT. For those features, use PDF Agile on your Windows PC to further annotate the same PDF.
Download GoodNotes from the App Store ($8.99, one-time purchase).
Import your PDF: tap the + button → select the PDF from Files or iCloud.
Annotate with Apple Pencil — full pressure sensitivity and palm rejection. Highlight, write notes, draw diagrams directly on the page.
To share annotations: Export as a flattened PDF (annotations baked in) or as a GoodNotes file (only readable in GoodNotes).
Limitation: GoodNotes annotations are stored in the app's internal format. If you export as "GoodNotes file," only GoodNotes users can see your annotations. Export as "Flattened PDF" to make annotations visible everywhere — but they become permanent (can't be edited).
If you annotate on iPad with the Files app or GoodNotes, then need to add more annotations on your Windows PC (sticky notes, stamps, export highlights), use PDF Agile:
Annotate on iPad using Files app or GoodNotes. Save/export the annotated PDF.
Transfer the PDF to your Windows PC (via iCloud, email, USB, or shared folder).
Open in PDF Agile — iPad annotations are preserved (they're embedded in the PDF). Add sticky notes, stamps, or additional highlights.
Export all annotations (from both iPad and PC) to TXT/CSV for your study notes.
If you have an Apple Pencil, here's how to set it up for PDF annotation:
Yes. Open the Google Drive app → tap the PDF → tap the three-dot menu → "Open in" → select Files app or GoodNotes. Annotations are saved back to Google Drive if you use the Files app.
This happens when you use apps like GoodNotes or Notability that store annotations internally, not in the PDF file. To fix this: export as a "Flattened PDF" from the app, or use the Files app which embeds annotations directly into the PDF.
Yes. The Files app supports finger-based highlighting and drawing. GoodNotes and Notability also work with finger input, but Apple Pencil gives better precision and palm rejection.
Annotate on iPad + refine on PC + export all annotations