Add Comments and Notes to PDF Online

Free plan
No install
Trusted by 100M+ users
Secure document processing

Leave comments, notes, and feedback directly on a PDF. Upload your document, add comments anywhere, and share it for collaborative review — all in your browser.

How it works

01

Upload your PDF

Drag and drop your PDF into DocHub, or select it from your device. It opens ready to mark up.

02

Add your comments

Use the Comment tool to attach notes to any text, and mention teammates to bring them into the conversation. Add highlights and other annotations alongside your comments as needed.

03

Share for review

Save the commented PDF to your device or securely to Google Drive, or share a link so others can add their feedback. Create a free DocHub account to save or share your PDF.

Experience the benefits of Add Comments to PDF

Comment Anywhere

Attach notes to any part of the document so feedback lands exactly where it belongs.

Mention Teammates

Tag people in a comment to pull them into the review and keep the discussion in context.

Real-Time Collaboration

Share a link and let others comment on the same PDF, with everything saved securely in the cloud.

More Than Notes

Highlight, underline, draw, or stamp alongside your comments — all in one editor.

Integrate DocHub with the apps you use and love

Get your documents done with ease from wherever you are working. DocHub connects to popular web applications so you can edit, sign, and share documents right from your favorite apps.

See all integrations

In-person signatures for your critical documents

Reviewing a contract

Add comments questioning a clause or requesting a change, then send the document back to the other party.

Giving feedback on a report or design

Drop notes on specific sections so the author knows exactly what to revise.

Collaborating with a team

Mention colleagues on the parts that need their input and gather everyone's comments in one file.

Marking up a student's work

Teachers can comment directly on submitted PDFs instead of writing separate feedback notes.

Proofreading a document

Leave inline notes on typos or wording without changing the original text.

Industry-leading security and compliance

DocHub complies with industry-leading standards, regulations, and certifications to ensure the most effective and secure workflows.

SOC 2 Type II certification

Guarantees the secure management of your data & the privacy of your clients.

HIPAA compliance

Protects your patients' private health information.

GDPR compliance

Regulates the use and holding of personal data belonging to EU residents.

PCI DSS certification

Safeguards credit/debit card data for every monetary transaction a customer makes.

FERPA

Protects the privacy of student records maintained by an educational institution.

CPRA compliance

Enhances the protection of personal data and privacy belonging to California residents.

Here's what our users have to say

Great solution for PDF docs with very little pre-knowledge required.

"Simplicity, familiarity with the menu and user-friendly. It's easy to navigate, make changes and edit whatever you may need. Because it's used alongside Google, the document is always saved, so you don't have to worry about it."

Pam Driscoll F
Teacher

A Valuable Document Signer for Small Businesses.

"I love that DocHub is incredibly affordable and customizable. It truly does everything I need it to do, without a large price tag like some of its more well known competitors. I am able to send secure documents directly to me clients emails and via in real time when they are viewing and making alterations to a document."

Jiovany A
Small-Business

I can create refillable copies for the templates that I select and then I can publish those.

"I like to work and organize my work in the appropriate way to meet and even exceed the demands that are made daily in the office, so I enjoy working with PDF files, I think they are more professional and versatile, they allow..."

Victoria G
Small-Business

Related features

Got questions?

Here are some common questions from our customers that may provide you with the answer you're looking for. If you can't find an answer to your question, please don't hesitate to reach out to us.

Contact us

How do I add comments to a PDF?

Upload your PDF, select the Comment tool, and attach a note to any part of the text. You can mention teammates, then save the file or share a link for others to review.

Is adding comments to a PDF free?

Yes — commenting is available on all DocHub plans, including Free. A free account is required to save or share the commented document.

Can other people reply to my comments?

Yes. Share the document and collaborators can add and respond to comments, using mentions to notify the right people.

Do comments change the original text?

No. Comments and notes sit on top of the document without altering its content, so the original stays intact.

Can I comment and highlight in the same document?

Yes. You can combine comments with highlight, underline, draw, and stamp tools in the same editor.

Can I add comments on my phone?

Yes. DocHub works in any modern mobile browser, so you can comment on a PDF from your phone or tablet without an app.

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