Switch from Adobe Acrobat to pdfFiller for a Annotate PDFs Online Using pdfFiller Solution For Free

Use pdfFiller instead of Adobe Acrobat to fill out forms and edit PDF documents online. Get a comprehensive PDF toolkit at the most competitive price.
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

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

Switch from Adobe Acrobat to pdfFiller in 4 simple steps

1
Sign up for free using your email, Google, or Facebook account.
2
Upload a PDF from your device or cloud storage, check the online library for the form you need, or create a document from scratch.
3
Edit, annotate, redact, or eSign your PDF online in seconds.
4
Share your document, download it in your preferred format, or save it as a template.

Experience effortless PDF management with the best alternative to Adobe Acrobat

Create and edit PDFs

Create and edit PDFs

Instantly customize your PDFs any way you want, or start fresh with a new document.
Fill out PDF forms

Fill out PDF forms

Stop spending hours doing forms by hand. Complete your tax reporting and other paperwork fast and error-free.
Build fillable documents

Build fillable documents

Add fillable fields to your PDFs and share your forms with ease to collect accurate data.
Save reusable templates

Save reusable templates

Reclaim working hours by generating new documents with reusable pre-made templates.
Get eSignatures done

Get eSignatures done

Forget about printing and mailing documents for signature. Sign your PDFs or request signatures in a few clicks.
Convert files

Convert files

Say goodbye to unreliable third-party file converters. Save your files in various formats right in pdfFiller.
Securely store documents

Securely store documents

Keep all your documents in one place without exposing your sensitive data.
Organize your PDFs

Organize your PDFs

Merge, split, and rearrange the pages of your PDFs in any order.

Customer trust proven by figures

pdfFiller is proud of its massive user base and is committed to delivering the greatest possible experience and value to each customer.
740K
active users
239
countries
75K
new subscribers per month
105K
user reviews on trusted platforms
420
fortune 500 companies
4.6/5
average user rating

Get started with
an all‑in‑one PDF software

Save up to 40 hours per month with paper-free processes
Make quick changes to your PDFs even while on the go
Streamline approvals, teamwork, and document sharing
Decoration
G2 Badge
G2 recognizes pdfFiller as one of the best tools to power your paperless office
4.6/5
— from 710 reviews
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
Best Support - Summer 2025
Easiest Setup- Summer 2025

Annotate PDFs Online

Sometimes, when completing a PDF form we don’t know the exact answer to a particular question or need feedback from the document recipient. In situations like this, you can add comments to PDF documents online using very simple tools. pdfFiller's simple but powerful document editor allows you to add comments anywhere in the document. In the past, you probably had to print the form and write your comments on the margins of the paper copy. Depending on your handwriting, the form might not have been very tidy and pleasant to look at. Now there is a far easier way to add comments to a PDF online and remove them when they are no longer needed. You can simply use pdfFiller’s editor to add comments to your PDF documents! To get started, you can upload a form to your account or open a document that’s already there. There are two ways to add your comments to a PDF document: text boxes and sticky notes. Select the Text Box tool

Image

in the main toolbar, click where you want to place the box and type your comment. To resize the text box, drag its corners or edges. Change the font and its size by choosing from the drop-down lists.

Image

You can underline, italicize or make your text bold using the respective tools.

Image

Change position of the text using the vertical and horizontal alignment tools.

Image

To change the color of your text, click the text color box and select the color you want.

Image

To change the background color, click the Background icon and select the color from the palette.

Image

To link the text box to a web page, click the Hyperlink button.

Image

In the dialog window that will open next, type the URL of the web page, then click Save.

Image

To delete the text box, click the trash can icon above it. To add a sticky note, select its icon

Image

in the main toolbar, click where you want to place the note and type your comment. To resize the sticky note, drag its corners or edges. You can format text the same way as you format it in text boxes. To change the color of a sticky note, click the Box icon and select the color from the palette.

Image

To learn more about how to add comments to PDFs online, please watch the following videos:

If you like being able to add comments to PDF documents, you might be interested in a lot of other great features that pdfFiller has to offer. Some of these include highlighting, blacking out or erasing text, drawing lines and arrows, and adding pictures. Check out these tutorials to see the other great things that pdfFiller can do for you!

pdfFiller is different from and not affiliated with Adobe Acrobat. With further questions about Adobe Acrobat products please contact Adobe Acrobat directly.

Our user reviews speak for themselves

Read more or give pdfFiller a try to experience the benefits for yourself
5.0
I believe the staff is dedicated to helping the customers and are very professional. Thought I might have to talk to them in person, but they answer and respond quickly through chat and do everything they can to help you right away. When I just had to get my material out right away and short on funds allowed me to try out the program just a few days after I explained my difficulty. Then after few days able to of course, pay for this program that has helped me so much. The forms are easier to read by using PDFfiller, and the video of how to work the software is helpful as well. The people are just awesome!! Very helpful and respond immediately. I would recommend this to friends and family as well.
evelyn g
4.0
What do you like best?
Simple to fill out and easy to understand for the most part
What do you dislike?
I was unable to prefill a document and use it for several people by saving each name as a different document.
Recommendations to others considering the product:
Please make saving multiple documend easier
What problems are you solving with the product? What benefits have you realized?
PDFfiller is a must have for our business
User in Marketing and Advertising

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
Choose Tools > Comment, and select the Highlight Text tool, the Strike through Text tool, or the Underline Text tool. Note: Drag from the beginning of the text you want to mark up. (Optional) To add a note, double-click the markup and add text in a pop-up note.
1:13 3:59 Suggested clip How to Annotate PDF Files on Windows — YouTubeYouTubeStart of suggested client of suggested clip How to Annotate PDF Files on Windows — YouTube
Go to View > Show Markup Toolbar or click the (sketch pen) icon on the top right. Use the selection and the markup tools annotate the PDF. You can use type, sketch, draw, use shapes, add notes, sign, and change the format for all.
Choose Tools > Comment. Draw in the PDF: To edit or resize the markup, select it and drag one of the handles to make your adjustments. To add a pop-up note to the markup, select the Hand tool, and double-click the markup. (Optional) Click the close button in the pop-up note.
Open your PDF document. Right-click on the PDF document where you want to add the sticky-note. Select Add Sticky-note from the right-click menu. Note: This option is not available in edit mode.
To display annotate (Comment) tools on a PC or Mac computer: Locate the pdf on your computer. Open on PC: Right-click the pdf and select Open With > Adobe Acrobat Reader. Open on a Mac: Click the file to select it. Click on the Comment button to display the Comment tools OR from the View menu, select Toolbars > Comment.
Annotate PDF FAQ To get started, simply open your PDF in the free online PDF annotator. Then use the available markup tools to annotate your PDF. Once you're done, click on the Download button to save the annotated PDF to your device. How to annotate a PDF on Mac? Annotate PDF Online | Free PDF Annotator - Xodo Xodo https://xodo.com › pdf-annotator Xodo https://xodo.com › pdf-annotator
Adding comments using the Add Comments tool Click the options menu (), and choose Add Comments. Select a file you want to comment, and click Add Comments in the right pane. Add comments to your PDF file online - Adobe Support Adobe Support https://helpx.adobe.com › document-cloud › help › add- Adobe Support https://helpx.adobe.com › document-cloud › help › add-
Join 64+ million people using paperless workflows to drive productivity and cut costs