The complete PDF solution across all platforms

  • Read, edit, and annotate PDFs.
  • Convert PDFs accurately with OCR.
  • Protect, manage, and share PDFs with ease.

Windows • macOS • iOS • Android

UPDF - Free PDF Editor

How to Modify a PDF Online Easily and Quickly

PDF files are commonly used for various industrial or academic purposes. If you have received a PDF file and found some mistakes in its text content, you would need a compatible PDF editor. This will help you to make changes in the text content and the inserted images effectively. Moreover, if you want to reduce the unnecessary content from your PDF, a PDF editor can help you delete the PDF pages.

In this article, we will guide you on how to modify PDFs online. Using online tools has many risks and we will explain every risk here. To avoid all the risks, we introduce an offline tool to modify PDF files named UPDF. By using our professional PDF editor, you can perform various tasks on your PDF file without any hassle.

Part 1: Can You Modify a PDF Online Free?

No, there is no such tool that can help you in modifying the PDF document free of cost. There are some online tools that can modify the PDF file, but they consist of various limitations. You won't be able to delete or edit the existing text in your PDF file. By using such a tool, you can only add new content to your PDF. Thus, online PDF tools have various limitations that won't enable you to alter documents effectively.

There are some online PDF editors that can allow you to modify PDF files online but not free of cost. They will offer different subscription plans that you have to buy before editing your PDF file. Hence, you cannot find an online PDF editor that can provide you with useful features to modify your files without any cost.

Part 2: How Do I Modify a PDF Online?

Do you want to modify PDFs online quickly? In this section, you can find easy instructions to modify or edit your PDF file:

Step 1: From your web browser, find an online PDF tool that contains all the essential editing functions. You can research the tool by reading its features on its official website. If you find the online PDF tool satisfactory, you can proceed to use that tool.

Step 2: Go to its upload page and hit the "Upload" button to import your PDF file for modification. On online tools, you can also upload the PDF file from Google Drive or Dropbox.

Step 3: Once you have uploaded the PDF file, you can begin editing your file. You can change font, size, and alignment and add annotations using the online tool. Once done with editing, you can download the modified document.

Part 3: Risks of Using Online Tools to Modify PDF Files

Do you know about the risks of using online tools? Using online tools for modifying PDF files can have various limitations. To find out about them, read this part of the article carefully:

  • One of the biggest risks that come with using an online PDF tool is a lack of security. While uploading and modifying your PDF file on web browsers, your content can be accessed by some unauthorized parties. Thus, if you are editing some confidential data on your PDF, you can expose it to a vulnerable environment. That's why it's essential to use a reliable online PDF tool.
  • Online tools do not offer guarantees for keeping your data secure. Due to this, there are always risks of getting your data loss while working on online PDF tools. So, make sure to create a backup copy of your PDF file to access your information even after data loss.
  • There are some online PDF tools that do not delete the data from their servers. It can question the privacy of your data and may end up leaking confidential information for advertising. To be cautious, you should always read the privacy policies of online tools.
  • One of the biggest disadvantages of using an online PDF tool is file size restrictions. There are file size restrictions in some PDF tools that do not allow you to upload a large PDF file. Moreover, you can face compatibility issues with particular types of PDF files in such tools.
  • If you want to use and access the advanced functions of an online tool, they can impose subscription fees. Thus, if you are a beginner, it can be expensive for you to buy subscription plans for online PDF tools.
  • Internet connectivity is also a significant requirement for online PDF tools. Without a stable internet connection, you won't be able to use online PDF tools.

As using online PDF tools come up with various restrictions and risk factors, you should opt for an offline PDF editor. One of the famous offline PDF tools that you can use is UPDF. It is a compatible software you can instantly launch on Windows, Mac, iOS, and Android platforms. Using this tool, you can effectively edit your existing text in the PDF document. Moreover, it does not restrict the user from uploading large-sized PDF files.

Along with performing basic functions on PDF, you can use UPDF for using advanced features. For instance, you can annotate your PDF document to write suggestions and comments in a structured manner. Furthermore, you can add watermarks, electronic signatures, and stickers to your PDF document to make it look customized.

Part 4: How to Modify a PDF Offline?

Do you want to use UPDF to modify your PDF files offline? Here are the detailed instructions that you can use to flawlessly edit your PDF file in the friendly interface of UPDF:

1. Modify PDF Text Offline

Once you have launched UPDF, hit the "Open File" button to import your file. After opening the desired file, click on "Edit PDF" from the left section. After opening the editing mode, you can modify your text style, size, and alignment. With this PDF tool, you can also bold and italicize the text with a single tap. You can also change the color of the text in this tool. Moreover, you can add or delete the textual content in its interface without difficulty.

modify pdf online with updf

2. Modify PDF Image Offline

UPDF also allows you to edit the images in a PDF file offline. To do so, open your PDF file and navigate to the editing mode.

  • From there, click on the "Image" option given on top to insert an image into PDF.
  • Just double-click on the desired image through which you can perform certain functions. For example, you can easily rotate, crop, and replace the image. Moreover, you can also extract and delete the image on this tool.
modify pdf online free with updf

3. Modify PDF Annotations Offline

To modify the annotations in your PDF, go to the "Comment" tab after importing the PDF file. From the above options, you can highlight the desired text content by adding an underline or squiggly lines. You can also strikethrough the text. Furthermore, you can add text comments, sticky notes, and text boxes with a single click. The annotation feature also allows you to insert shapes and use a pencil to draw on the PDF file.

modify pdf text online with updf

4. Modify PDF Links, Watermarks, Backgrounds, Header & Footers Offline

UPDF also allows you to add and modify the links in a PDF file. To insert the link, you can go to the editing mode and click on the "Link" option displayed on top.

It also provides "Page Tools" through which you can change the background of your PDF pages efficiently. Moreover, you can insert header and footers, and watermarks to your PDF document for more modifications.

modify pdf file online with updf


Modifying a PDF file online may sound easy, but it has various restrictions that can interrupt your workflow. In this article, we have shed light on the disadvantages of modifying PDF text online. Thus, to help you choose the perfect offline tool for modifying your PDF file, we recommend you use UPDF. It has a clean interface and provides all the beneficial features for editing and modifying PDF files effortlessly.