How To Add Comments To A PDF Online For Free

Drop document here to upload
Select from device
Up to 100 MB for PDF and up to 25 MB for DOC, DOCX, RTF, PPT, PPTX, JPEG, PNG, JFIF, XLS, XLSX or TXT
Note: Integration described on this webpage may temporarily not be available.
0
Forms filled
0
Forms signed
0
Forms sent
Last updated on Jan 16, 2026

Try these PDF tools

Edit PDF
Quickly edit and annotate PDFs online.
Sign
eSign documents from anywhere.
Request signatures
Send a document for eSignature.
Share
Instantly send PDFs for review and editing.
Merge
Combine multiple PDFs into one.
Rearrange
Rearrange pages in a PDF document.
Compress
Compress PDFs to reduce their size.
Convert
Convert PDFs into Word, Excel, JPG, or PPT files and vice versa.
Create from scratch
Start with a blank page.
Edit DOC
Edit Word documents.

Discover the simplicity of processing PDFs online

Card illustration
Upload your document in seconds
Card illustration
Fill out, edit, or eSign your PDF hassle-free
Card illustration
Download, export, or share your edited file instantly
Top-rated PDF software recognized for its ease of use, powerful features, and impeccable support
Users Most Likely To Recommend - Summer 2025
Grid Leader in Small-Business - Summer 2025
High Performer - Summer 2025
Regional Leader - Summer 2025
Easiest To Do Business With - Summer 2025
Best Meets Requirements- Summer 2025

Every PDF tool you need to get documents
done paper-free

Card illustration

Create & edit PDFs

Generate new PDFs from scratch or transform existing documents into reusable templates. Type anywhere on a PDF, rewrite original PDF content, insert images or graphics, redact sensitive details, and highlight important information using an intuitive online editor.
Card illustration

Fill out & sign PDF forms

Say goodbye to error-prone manual hassles. Complete any PDF document electronically – even while on the go. Pre-fill multiple PDFs simultaneously or extract responses from completed forms with ease.
Card illustration

Organize & convert PDFs

Add, remove, or rearrange pages inside your PDFs in seconds. Create new documents by merging or splitting PDFs. Instantly convert edited files to various formats when you download or export them.
Card illustration

Collect data and approvals

Transform static documents into interactive fillable forms by dragging and dropping various types of fillable fields on your PDFs. Publish these forms on websites or share them via a direct link to capture data, collect signatures, and request payments.
Card illustration

Export documents with ease

Share, email, print, fax, or download edited documents in just a few clicks. Quickly export and import documents from popular cloud storage services like Google Drive, Box, and Dropbox.
Card illustration

Store documents safely

Store an unlimited number of documents and templates securely in the cloud and access them from any location or device. Add an extra level of protection to documents by locking them with a password, placing them in encrypted folders, or requesting user authentication.

Customer trust by the numbers

64M+
users worldwide
4.6/5
average user rating
4M
PDFs edited per month
9 min
average to create and edit a PDF
Join 64+ million people using paperless workflows to drive productivity and cut costs

Why choose our PDF solution?

Cloud-native PDF editor

Access powerful PDF tools, as well as your documents and templates, from anywhere. No installation needed.

Top-rated for ease of use

Create, edit, and fill out PDF documents faster with an intuitive UI that only takes minutes to master.

Industry-leading customer service

Enjoy peace of mind with an award-winning customer support team always within reach.

What our customers say about pdfFiller

See for yourself by reading reviews on the most popular resources:
I was really in a bind & PDFFiller rescued me. I'm grateful that this service is available & so easy to use. I was able to produce the document I needed in no time at all.
Carla S
2016-04-08
Provided files that otherwise would require me to physically write information in, this can be seen unprofessional to some businesses. Worth every penny
Daniel L
2016-11-01
I've often wished I could fill out information on the screen, not just print off and then fill by hand. My handwriting is really scratchy and hard to read, quite unprofessional. The PDFfiller has been an answer to my prayers.
Ruth Z
2017-04-16
I has made my job easier. I use numerous forms as a Clinical Manager for a Home health agency that does not utilize EMR. I am now able to fill out these forms in half the time. I don't have to look through countless paper folders to locate my forms, just locate on my desk top, complete and print!
Marla R
2018-06-19
I do like the ease of use as this is the first time I have used a PDF application. I have just started using Adobe and unfortunately I think I like that better. Not positive yet.
Nicole
2019-12-02
The free tools and conversion into a… The free tools and conversion into a PDF doc is awesome! The basics is all I need. The only struggle I had was having to figure out how to remove the verified by pdffiller signature date stamp
Lyndra Stacker
2024-04-25
Once Ias able to reset my info from my iphone it has been excellent. I think the iphone can't handle newer apps. Will continue to use, thumbs up.
samara s
2024-03-25
On my first document its easy to… On my first document its easy to navigate through all of the tools and site. I'm very satisfied and happy to have joined.
Jennifer Vincent
2021-05-05
I am a relatively new user to pdffiller, but have found the platform user friendly and does exactly what I need it to. Helping me modernise a lot of statutory requirements for e-signatures and template creations. When I experienced issues loading documents due to permissions through my work network, the support team at pdffiller responded quickly and continued assisting myself and co-ordinated with my employers IT support function to resolve it within 24 hours, allowing me to get on with my job.
Calum R
2020-09-25

How-to Guide

How to Add Comments to a PDF:

01
Upload your document to the uploading pane on the top of the page
02
Choose the Add Comments to a PDF feature in the editor`s menu
03
Make all the needed edits to your document
04
Push “Done” orange button in the top right corner
05
Rename the document if it`s needed
06
Print, save or share the file to your computer

The easy way to Add Comments to a PDF online

We all can deal with documents digitally, no matter who we are. It is important to edit the document's content and fill it out efficiently. Just about everyone uses document templates instead of making blanks from scratch. But it takes more than just a reader app when you need to make changes. There are dozens of platforms allowing you to edit form templates, and pdfFiller is one of them you can use for every aspect of your routine. It’s full of tools for managing documents. Individuals and businesses alike benefit from the ability to Add Comments to a PDF. Don’t know how to Add Comments to a PDF on pdfFiller? See the tutorials to get the answers precise and short. Use it for your needs or collaborate with other people and businesses, all online.

Get documents done
from anywhere

Create, edit, and share PDFs even on the go. The pdfFiller app equips you with every tool you need to manage documents on your mobile device. Try it now on iOS or Android!

For pdfFiller’s FAQs

Below is a list of the most common customer questions. If you can’t find an answer to your question, please don’t hesitate to reach out to us.
What if I have more questions?
Contact Support
Add new text to a PDF You can add or insert new text into a PDF using any of the fonts installed on the system. Select Tools > Edit PDF > Add Text. Open a PDF and then choose Tools > Edit PDF > Add text. Drag to define the width of the text block you want to add.
To create a pop-up note, select on the annotation toolbar and click it on any part of the page without text. A pop-up window will appear. You can delete the pop-up note by tapping the trash bin icon. You can also move the note around by dragging it.

#1 usability according to G2

Try the PDF solution that respects your time.
Users Most Likely To Recommend - Summer 2025
Grid Leader in Small-Business - Summer 2025
High Performer - Summer 2025
Regional Leader - Summer 2025
Easiest To Do Business With - Summer 2025
Best Meets Requirements- Summer 2025