Are my PDF files secure when using this tool?

Yes, your PDF files are secure when using this PDF annotator. Our servers are protected by the latest end-to-end encryption to keep your files and data private and protected.

Can I undo or delete annotations after adding them?

Yes, you can undo or delete annotations after adding them as long as you have not downloaded the file yet. If you accidentally download a file with annotation mistakes, simply re-upload it to our online PDF editor to remove them.

Can I annotate multiple PDFs at once?

No, you can’t annotate multiple PDFs at once in our online PDF editor. You need to upload each file separately to annotate it.

Is there a limit to the number of pages I can annotate?

No, there’s no limit to the number of pages you can annotate. However, we have a 500 MB file size limit for the documents you can upload. As long as your file meets this limit, it doesn’t matter how many pages it contains.

How do I edit or move an existing annotation?

To edit or move an existing annotation, you need a tool that can edit and write on PDFs, meaning a simple annotator won’t be enough. Fortunately, pdf.net has both a PDF editor and an annotation tool that you can use to update your file.

Will my annotations be visible on all PDF readers?

No, your annotations might not be visible on all PDF readers because some applications don’t support the standard markups and highlights on PDF files.

How do I remove annotations from a PDF?

To remove annotations from a PDF, use pdf.net’s online tool for annotating documents and editing PDF files. After uploading your file, simply select and delete the annotation you want to remove and then download the updated document.

Is it possible to annotate scanned PDF documents?

Yes, it’s possible to annotate scanned PDF documents with pdf.net. All you need to do is follow the same steps for annotating regular PDF files.

Can I annotate encrypted or password-protected PDFs?

No, you can’t annotate encrypted or password-protected PDFs. To do so, you would need to save its contents in a separate file and add your annotations there.

Can I use pdf.net on a Mac, Linux, or smartphone?

Yes, you can use pdf.net on a Mac, Linux, or smartphone to write on a PDF online. As a cloud-based platform, our editor can be accessed on virtually any device or browser with an internet connection.

What file formats can I annotate?

Mark up PDF files online with highlights, drawings, and comments. You can also upload Word documents (DOC, DOCX) and JPG and PNG images, and your file opens in the editor.

High-Quality Tool to Annotate PDF Files

Save time and annotate PDF documents on any device instantly with online PDF annotation tool — no downloads required.

Supports PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, JPG, PNG, HEIC, HEIF

Files stay private

I've been struggling with massive files for years now - and only have Adobe Reader installed. Another online resource - at about the same charge as yourselves - cannot handle files of over 100Mb. So, I was delighted to find you tonight.

Mr Simon DanbyTrustpilot review

Start editing your PDF

All PDF tools in one place

No installs, no app-switching — works on any device

Annotate

Mark up PDFs: draw, highlight, erase. Multiple colors & line widths.

Merge Files

Combine multiple PDFs into one. Reorder files before merging.

Compare PDF

Spot every change between two PDFs. View side by side or overlay.

Convert PDF to Word

Convert PDF to editable DOC/DOCX. Retain layout & fonts.

Sign Document

Type, draw, or upload signature. Legally binding.

Remove Signature Background

Make your signature transparent to sign PDFs without a white box.

Request Signature

Send PDFs to anyone for signing. Mark where to sign, invite by email. Get signed document back.

Share PDF

Upload and share PDF via secure link or email in seconds. Control who can view or edit.

More tools

Convert Word to PDF

Transform DOC/DOCX to PDF. Preserve formatting.

Convert Excel to PDF

Turn XLS & XLSX into a clean, shareable PDF. Formatting intact.

Convert Markdown to PDF

Paste or upload your .md file and get a formatted PDF in seconds. Tables and code blocks included.

Convert PNG to PDF

Combine multiple PNG images into one PDF. Resolution maintained.

Convert PDF to PNG

Split PDF pages into separate PNGs. Full resolution preserved.

Convert JPG to PDF

Merge JPEG photos into a single PDF file without losing quality.

Convert HEIC to PDF

Turn iPhone HEIC photos into a shareable PDF. Opens on any device.

Convert PDF to JPG

Turn PDF pages into separate JPEG images. Ready to share or upload.

PDF to Excel

Turn PDF tables into editable spreadsheets ready to use in Excel or Google Sheets.

PDF to CSV

Extract table data from PDFs into clean CSV files ready for spreadsheets and data analysis.

PDF to PowerPoint

Get editable PPT & PPTX slides. Keep fonts & layout.

Convert PowerPoint to PDF

Turn PPT & PPTX into a share-ready PDF. Opens on any device.

Bank Statement to Excel

Convert PDF bank statements to editable Excel or CSV files for accounting and analysis.

Add Text

Customize font, size & color. Move & resize easily.

Compress

Reduce PDF file size with 3 compression levels.

Change Text

Edit PDF text directly. Change font, size, color.

Add Image

Add logos, photos & graphics to PDFs. Adjust size and position.

Split File

Split PDF into multiple files. Choose any page to divide.

Rotate Pages

Adjust PDF orientation easily. Choose single, multiple, or all pages.

Rearrange Pages

Drag & drop to reorganize. Delete, duplicate, rotate pages.

Add Page Numbers

Number pages automatically. Choose position, format, margins.

Bates Numbering

Add Bates numbers automatically. Choose prefix, suffix, and numbering style.

Extract Pages

Select the pages you need and save them as a new PDF.

Protect PDF

Secure PDF from unauthorized use with a password.

Unlock PDF

Remove passwords and restrictions with just a few clicks.

Chat with PDF

Ask AI any questions about your PDF.

PDF Summarizer

Summarize PDFs into key points with AI.

Generate PDF

Describe a doc you need and get a formatted PDF.

How to annotate PDF files

1
Upload your file
2
Draw, highlight, or write on PDF
3
Download the edited file

Why people prefer pdf.net

Simple and easy for daily use
Our online PDF editor features a clean, intuitive, and user-friendly interface designed for amateurs and professionals alike. You can navigate it with ease and edit your PDF file, even if you’ve never done it before.
All‑in‑one PDF editor
Our editor offers a robust and comprehensive set of features that allow you to customize your documents, merge them, sign them, and much more. No need to transfer your files between several applications anymore.
Keeping formatting without issues
No more messy documents and inconsistent formatting across multiple systems or devices. Our online PDF editor is cross-platform compatible and maintains uniformity whether you’re using a PC, MacOS, smartphone, or tablet.

People all over the world trust pdf.net to edit their docs

Needed a quick solution to compress a PDF document and PDF.net was so easy!

Gregory MeyersTrustpilot review

Needed a quick solution to compress a PDF document and PDF.net was so easy!

Gregory MeyersTrustpilot review

Great product for anyone looking for something easy to use and that reads the font really well

JuntosTrustpilot review

I was able to delete the tablature on a PDF guitar download and get the results I needed. Thank you, gracias, arrigato, toda, danka.

jjayTrustpilot review

All in all, an excellent all-around tool that's become a real fixture in my day-to-day.

hans005AppSumo review

Frequently asked questions

Are my PDF files secure when using this tool?: Yes, your PDF files are secure when using this PDF annotator. Our servers are protected by the latest end-to-end encryption to keep your files and data private and protected.
Can I undo or delete annotations after adding them?: Yes, you can undo or delete annotations after adding them as long as you have not downloaded the file yet. If you accidentally download a file with annotation mistakes, simply re-upload it to our online PDF editor to remove them.
Can I annotate multiple PDFs at once?: No, you can’t annotate multiple PDFs at once in our online PDF editor. You need to upload each file separately to annotate it.
Is there a limit to the number of pages I can annotate?: No, there’s no limit to the number of pages you can annotate. However, we have a 500 MB file size limit for the documents you can upload. As long as your file meets this limit, it doesn’t matter how many pages it contains.
How do I edit or move an existing annotation?: To edit or move an existing annotation, you need a tool that can edit and write on PDFs, meaning a simple annotator won’t be enough. Fortunately, pdf.net has both a PDF editor and an annotation tool that you can use to update your file.
Will my annotations be visible on all PDF readers?: No, your annotations might not be visible on all PDF readers because some applications don’t support the standard markups and highlights on PDF files.
How do I remove annotations from a PDF?: To remove annotations from a PDF, use pdf.net’s online tool for annotating documents and editing PDF files. After uploading your file, simply select and delete the annotation you want to remove and then download the updated document.
Is it possible to annotate scanned PDF documents?: Yes, it’s possible to annotate scanned PDF documents with pdf.net. All you need to do is follow the same steps for annotating regular PDF files.
Can I annotate encrypted or password-protected PDFs?: No, you can’t annotate encrypted or password-protected PDFs. To do so, you would need to save its contents in a separate file and add your annotations there.
Can I use pdf.net on a Mac, Linux, or smartphone?: Yes, you can use pdf.net on a Mac, Linux, or smartphone to write on a PDF online. As a cloud-based platform, our editor can be accessed on virtually any device or browser with an internet connection.
What file formats can I annotate?: Mark up PDF files online with highlights, drawings, and comments. You can also upload Word documents (DOC, DOCX) and JPG and PNG images, and your file opens in the editor.

High-Quality Tool to Annotate PDF Files