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Highlight and annotate a PDF online (no installs)

•Edit•Open Edit PDF
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Whether you’re reviewing a contract, grading homework, or collaborating on a proposal, annotations keep feedback attached to the page. With Edit PDF, you can highlight text, add notes, draw, and export an updated copy—without installing software.

In this guide

When PDF annotation helps

  • Reviewing and approving documents (highlight key clauses)
  • Adding comments for teammates or clients
  • Marking corrections on forms or drafts
  • Preparing a PDF before signing
Tip: If the PDF is a scan (image-only), you can still highlight and draw—but you won’t be able to select underlying text.

Step-by-step: highlight and annotate

  1. Open Edit PDF and upload your file.
  2. Select the Highlight tool and drag across the text you want to emphasize.
  3. Use Notes or Text to add comments (keep them short and specific).
  4. Use Shapes (arrows/rectangles) to point to exact areas.
  5. Download the updated PDF and review it in a standard PDF reader to confirm everything displays correctly.
Try Edit PDF

Tips for clean, readable markups

1) Use consistent colors

Pick one color for “must fix,” another for “nice to have.” Too many colors makes the review harder to follow.

2) Keep highlights thin

Overly thick highlights can obscure text (especially on small fonts). Zoom in and re‑highlight if needed.

3) Don’t forget the final steps

  • If you need to sign after marking up: use Sign PDF.
  • If you need to share securely: apply a password with Protect PDF.

4) Make the file easy to track

Rename outputs like proposal-reviewed-v1.pdf or contract-comments.pdf. Versioned filenames prevent confusion in email threads.

FAQ

Will annotations show up in Adobe Reader and other viewers?

In most cases, yes. Always open the exported file in a standard viewer to confirm your highlights and notes appear as expected.

Can I remove or edit highlights later?

It depends on how the PDF is saved and which app you use later. Some workflows “flatten” annotations. If you need future edits, keep an unflattened copy and avoid re‑exporting through tools that rasterize pages.

Can I annotate a scanned PDF?

Yes—you can draw, highlight, and add notes. But you generally can’t select or edit the underlying text without OCR.

Is this the same as adding text to a PDF?

Adding text is one part of editing. For a focused walkthrough, see How to add text to a PDF.

Next steps