Adding review comments to PDFs — for feedback, corrections, or collaboration — is straightforward with the annotation tools in PDF Studio.
Navigate to PDF Studio and upload your PDF.
Select the Text tool. Click any location on the page to place a text annotation. Type your comment. Use a colored text or bordered box style to make comments stand out from the document text.
Tip: Use a bright color (blue, red, or green) for comment text boxes to visually distinguish them from the original document content.
Click Download PDF. All comments are permanently embedded and visible when the file is opened by the recipient.
Comments embedded with this method are flattened text annotations — recipients can see them but cannot reply in the file. For threaded comments, use Adobe Acrobat's review features.
Yes — completely free at pdfeditor.onl/pdf-studio.