You search for "annotate PDF free Windows" and find plenty of options. But when you actually install them, you hit these walls:
This guide tests 5 free Windows PDF annotation tools against real-world use cases: highlighting, commenting, stamping, scanned PDF handling, and annotation export.
| Feature | PDF Agile | Adobe Acrobat Reader | Foxit Reader | Xodo | Microsoft Edge |
|---|---|---|---|---|---|
| Multi-color highlighting | ✓ 5 colors | ✓ Yes | ✓ Limited | ✓ Yes | ✗ 1 color |
| Sticky notes with author | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✗ No |
| Stamps & signatures | ✓ Yes | ✗ Paid only | ✓ Limited | ✗ No | ✗ No |
| Freehand drawing | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Basic |
| OCR for scanned PDFs | ✓ Built-in | ✗ No | ✗ No | ✗ No | ✗ No |
| Export comments to TXT/CSV | ✓ Yes | ✗ Paid only | ✗ No | ✓ PDF only | ✗ No |
| Works offline | ✓ Yes | ✓ Yes | ✓ Yes | ✓ App only | ✓ Yes |
| File size limit | ✓ No limit | ✓ No limit | ✓ No limit | ✓ 100MB | ✓ No limit |
| Truly free tier | ✓ Full features | ✓ Limited | ✓ Limited | ✓ Yes | ✓ Built-in |
Key finding: PDF Agile is the only free Windows tool that handles scanned PDFs (via built-in OCR), exports annotations to TXT/CSV, and includes stamps & signatures — all without a paid upgrade. Other tools require paid subscriptions for at least one of these features.
Download and install PDF Agile from the official site. Free, no sign-up, no credit card.
Open your PDF. Text-based PDFs open instantly. Scanned/image PDFs trigger automatic OCR — text becomes selectable within seconds.
Choose your annotation tool from the toolbar: Highlight (5 colors), Sticky Note (with author & timestamp), Stamp (APPROVED / DRAFT / CONFIDENTIAL / custom), Freehand Draw, or Text Box.
Apply annotations. Drag to highlight text. Click to add sticky notes. Select a stamp and place it. All annotations are auto-saved.
Export annotations. Click File → Export Comments to save all highlights, notes, and page numbers as a TXT or CSV file. Share the annotated PDF — annotations are embedded and visible in any PDF viewer.
Download Adobe Acrobat Reader DC (free version) from Adobe's website.
Open your PDF. Click Tools → Comment to open the annotation sidebar.
Use the Highlight tool, Sticky Note tool, or Drawing tool. Select text → right-click → "Highlight Text".
Save (Ctrl+S). Annotations are embedded in the PDF.
Limitations: Adobe Reader's free tier cannot: (1) highlight scanned PDFs, (2) export comments to TXT/CSV, (3) add stamps or signatures. These require Acrobat Pro at $23/month. If you need any of these features free, use PDF Agile instead.
Download Foxit Reader (free version) from Foxit's website.
Open your PDF. Click Comment in the toolbar to access annotation tools.
Foxit supports highlighting, sticky notes, and basic drawing. Highlight colors are limited compared to PDF Agile.
Save (Ctrl+S). Annotations are embedded in the PDF.
Limitations: Foxit's free tier lacks: stamps & signatures (paid feature), annotation export, and OCR for scanned PDFs. It's a good lightweight option for basic text-based highlighting, but not for professional annotation workflows.
Go to xodo.com or download the Xodo Windows app from the Microsoft Store.
Upload your PDF (web version) or open it locally (app version). Xodo supports highlighting, sticky notes, and drawing.
Annotate and download. The web version requires uploading your file to Xodo's servers — not suitable for confidential documents.
Limitations: Xodo's web version uploads your PDF to their servers (privacy concern for sensitive documents). The app version works offline but has a 100MB file size limit. No OCR, no annotation export, no stamps.
Drag your PDF into Microsoft Edge — it opens automatically.
Click the pen icon at the top to enter annotation mode. You can highlight (single color only) and draw freehand.
Click Save or Ctrl+S. Annotations are saved in the PDF.
Limitations: Edge only supports single-color highlighting and basic drawing. No sticky notes, no stamps, no OCR, no annotation export. Useful for quick one-off highlights, but not for serious annotation work.
Scanned PDFs (contracts, receipts, textbook pages) are images — you can't select text in them. Here's how each tool handles this:
| Tool | Can Highlight Scanned PDF? | How? |
|---|---|---|
| PDF Agile | ✓ Yes | Built-in OCR converts scan to selectable text automatically |
| Adobe Reader | ✗ No | Cannot highlight scanned text — requires separate OCR tool |
| Foxit Reader | ✗ No | Cannot highlight scanned text — requires separate OCR tool |
| Xodo | ✓ Draw only | Can draw freehand lines over the image, but can't select text |
| Edge | ✓ Draw only | Can draw freehand lines over the image, but can't select text |
If you annotate a 40-page report and need a summary of your highlights and comments, you need annotation export. Here's what each tool offers:
Bottom line: If you need to extract your annotations into a study summary or audit trail, PDF Agile is the only free Windows tool that does this. Adobe Acrobat Pro can do it, but costs $23/month.
Yes. PDF Agile offers full annotation features (highlighting, sticky notes, stamps, OCR, export) completely free. Adobe Reader and Foxit are also free but with significant limitations — they can't handle scanned PDFs or export annotations without paid upgrades.
Yes — open the PDF in Microsoft Edge (built into Windows 10/11). You can highlight and draw, but only with limited features (single color, no sticky notes, no stamps). For full annotation, install PDF Agile.
Your PDF is likely a scanned image, not text-based. Most free tools (Adobe Reader, Foxit, Edge) can't highlight scanned PDFs. PDF Agile's built-in OCR converts scanned images into selectable text automatically — no separate OCR step needed.
PDF Agile — it handles both text-based and scanned textbook PDFs, supports 5 highlight colors for different categories (definitions, evidence, questions), and exports all highlights into a study summary TXT file. All free.
PDF Agile, Adobe Reader, Foxit, and Edge all work offline. Xodo's web version requires internet; its Windows app works offline but has a 100MB file size limit. For offline annotation with no limits, use PDF Agile.
Free · No subscription · Handles scanned PDFs · Export annotations