How to annotate PDF

Mark up a PDF by highlighting, drawing, and adding comments so you can review and collaborate faster. Focused on highlighting, drawing, and commenting to speed up reviews. With wowPDF, everything runs in your browser—no installs—and your files are processed securely with automatic deletion.

Annotate PDF Online Browse more PDF Tools tools

Fast: Convert in seconds.
Private: Files are deleted automatically after processing.
Browser-based: No installs or signups for basic use.

Key features

Highlight and draw
Add comments
Export marked-up PDF

Step-by-step: How to annotate PDF

Open the tool: Annotate a PDF Online.
Upload your file (.pdf).
Click the convert/action button and wait for processing to complete.
Download your result instantly.

Tips for better results

If your PDF is scanned, results may vary. For the best output, use a text-based PDF when possible.
For complex layouts, review the output and make minor adjustments if needed.
For large files, try compressing first with Compress PDF.

Common use cases

Work and business documents
School assignments and research
Sharing files with clients or teams
Archiving and compliance workflows

Related tools

Convert PDF files to editable Word docs

Export DOC/DOCX to PDF for sharing

Combine multiple PDFs into one file

Extract pages or split into separate PDFs

FAQ

Is How to annotate PDF free on wowPDF?

Yes. wowPDF offers a free online version with no signup required for basic usage.

Will my file formatting be preserved?

Most files convert accurately. Complex layouts or scanned PDFs may need minor adjustments.

Are my files safe?

Files are processed securely and deleted automatically after processing.

Ready?

Upload your file now and convert it instantly with wowPDF.

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