Edit PDFs with comments online

Annotating PDF editors are used for editing PDF documents to add notes, annotations, and other textual or graphical information related to the documents` content. Comments may refer to those parts of the document that need to be changed in order to communicate your thoughts and opinions to other editors. The ability to reply to other users’ comments is especially useful in collaborative work where members can read other editors’ annotations.

Annotating PDF means the comments displayed over the original content of the document. You can use comments to suggest changes to a PDF document, ask clarifying questions, and comment on your edits for other editors. Commenting tools don’t change the document’s original contentt, and the comments themselves don’t appear when printed.

The best way to annotate PDF is to use an online editor that allows you to create, edit, add comments in your PDF documents from any device: computer, tablet or even using apps to take notes on PDF. Lumin is the best PDF note-taking app; it is a versatile tool with which you can take notes on PDF, create comments and annotate PDF. With dozens of apps for annotating PDFs to select from, choose a verified app that is already used by over 48 million users worldwide.

Below you will find general instructions on how to work with comments: highlight, strikethrough, underline, replace or delete text online; how to add, edit and delete sticky notes.

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Highlight, strikethrough, or underline text online

Highlight, strikethrough, or underline text online requires a few simple steps.

You can easily highlight text in apps for highlighting PDFs or on a computer in a selected document.

Just click on the Comment section and tap Text Markup

Then choose the Highlight Text tool and select needed text in the PDF document.

To strikethrough the text, press the Comment section, and tap Text Markup.

Then select the Strikethrough Text tool.

To underline text online, choose Comment section and tap Text Markup.

Then select the Underline Text tool.

Now you know how easy it is to use these tools to highlight, strikethrough or underline important words or sentences and key points in a PDF.

Replace text online

First, select the text you want to replace.

Then choose the Comment section, tap Text Markup, and add a note to replace text.

The previously selected text will be crossed out, and a pop-up note will open. Enter new text to replace the selection or add a comment to it.

Delete text online

If, on the contrary, you need to suggest the deleting of a single word or text, use the Comment section, tap Text Markup and then Strikethrough text tool again.

To delete individual words in the text, move the mouse pointer over the editable area and use the Backspace button.

If you need to delete an entire line/block of text in a document, select the text block for deletion with the cursor, right-click on it and select the Delete option from the context menu that opens.

Add a sticky note online.

For writing on PDF app notes, click the Comment section and tap Sticky Note; click anywhere in the PDF document to type text.

Apps for writing on PDFs provide convenient iOS and Android versions of online PDF editors with full support with the same functions as in the computer version.

Edit a sticky note comment online 

You only need two clicks to edit a sticky note comment online in the annotation apps.

Just double-click on the document’s note icon to edit the note. Edit the comments in the annotation text box.

Delete a sticky note online

And the last action that can take place in the section Sticky note online it’s Deleting the sticky note.  

Select the Sticky note icon you created before and press the Delete button.

Apps PDF editors to watch out.

In this age of modern technology, more and more users prefer to work with apps using tablets and phones than personal computers. As a result, there are a lot of best PDF annotation app options on the web. Below, we’ll take a look at popular edit PDF online apps. 


DocHub is an app that will allow to quickly and efficiently work with PDF documents. DocHub will allow commenting, signing documents, managing pages, and sharing documents on blogs and social networks. To use the service, registration is required, but you can go through automatic registration using a Google account.

This editor has an excellent design for the user. This editor is trusted by 10 million users from all over the globe.

Lumin PDF 

Lumin PDF is another very convenient and user-friendly PDF document editor. Lumin PDF is both a browser version and a phone app. It is an intuitive tool for viewing, editing, and sharing PDF files. With it, you can create PDF files and subject them to advanced editing. The app allows adding text, images, comments, shapes, and signatures.

The benefits of this service are:

  • Cloud Integration allows files automatically saved to cloud Google Drive, Dropbox, or Lumin.
  • Cross-Platform allows accessing, creating, and editing PDF documents wherever you go – from your phone, tablet, or computer.
  • Collaborating with the team directly in documents, in real-time
  • Real-time Sync allows seeing the changes when someone is editing PDF documents and many more.


Xodo is a PDF editor to use that includes all the annotation features you need to mark up your documents without having to create an account. You can fill out PDF forms, search documents, highlight or strikethrough text, add images, text boxes, forms, signatures, and other annotations. Xodo is also designed for collaboration; you can work on the same online document.

Once you sign up for an account, you can extend the app’s functionality and invite colleagues via email or copy the link to your document, just like you do in Google Docs.

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The next time you open a PDF file and want to add comments, you can follow our guide. Use one of the apps above, and you can easily highlight or strikethrough text, replace it, delete it or leave comments for your colleagues in minutes.