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Best 2024 PDF Signature Apps for iPhone and iPad: Top 5 Picks

Being able to sign a document electronically is of paramount concern if your business handles PDF documents or if you choose to work remotely. To ensure that the signature you add to the document is binding, you need a tool that not just makes the process easy, but also very effective.

Here, we will look at the top 5 PDF signature apps for iPhone and iPad. These tools are ideal solutions for signing a PDF document on the go.

Top 5 PDF Signing Apps for iPhone and iPad

The following are the top 5 options you have if you want to successfully sign a PDF document on your iPhone or iPad;

1. UPDF iOS App

UPDF for iOS is the leading PDF signature app for iPhone and iPad in 2024. This all-in-one PDF editor streamlines all tasks related to PDF and lets users modify the document content. Furthermore, one of its standout features is its support for electronic signatures.

It provides users with a freehand tool to add their signature to any PDF document to maintain the integrity of crucial documents. So, download it now and try its robust signature feature to confirm your presence on digital documents.

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With an effortless approach of drawing your signature with a finger or stylus, you can add a personalized touch to set your documents apart. Additionally, these electronic signatures add a modern and professional touch to your PDF's authentication.

To see a more objective UPDF review, you can consider visiting the 9to5Mac website to get valuable insights for making well-informed decisions. Plus, you can get detailed instructions on how to add a signature to your phone and iPad by watching this video.

2. PDF Viewer

If you are looking for a very simple way to sign a PDF document on iPhone or iPad, PDF Viewer is one of your choices. This PDF signature app has a very simple user interface that supports powerful annotation tools. These tools can be useful for more than just signing a PDF document. You can use them to add text to a document, highlight or even draw on the document.

The PDF Viewer interface is so easy to use, anyone can figure it out in a matter of seconds. This makes it the ideal solution when you are in a hurry and would rather not spend a lot of time learning how a signature tool works. It also comes with additional features allowing you to rearrange, insert blank pages, merge PDF pages, or even delete PDFs. PDF Viewer is free to download, but it comes with in-app purchases for some premium features.

3. PDF Expert

If your goal is to sign PDF documents, but you plan on using your iPhone or iPad to manage documents in the future, then PDF Expert may be a good choice. This is because, on top of annotation features, this PDF signing app also comes with additional features to help create, edit, and do all sorts of things with any PDF document. The annotation feature in particular allows you to easily add digital signatures anywhere on the document.

If you would like to edit the document further, you can create customizable stamps, markup, or highlight any section of the document very easily. It is also one of the best ways to edit PDF documents at the same time and you can even use it to password-protect any document. You can download PDF Expert for free, but there are some features that can only be accessed with in-app purchases.

4. PDFpen 6

PDFpen is another great PDF signing app that you can use to instantly add a signature to any PDF document on iPhone or iPad. This app allows you to open and view a PDF document on your iPhone or iPad and then annotate it in a variety of ways. You can highlight the text, add comments to the document and even fill out PDF forms and draw in a signature.

It has built-in technology that ensures you are marking up only the section of the document that you want to and nothing else. This means that you can easily add the signature to any part of the document, making the signature or any other type of annotation credible and very specific. You can also choose to add images to the document and PDFpen allows you to resize, move or copy any images that you add to the document. The fact that it supports the use of styluses makes it one of the easiest solutions to use to sign a PDF document. But you may not be able to use it to make macro changes to the PDF, such as editing any of the text in the document. PDFpen 6 is free to download, but there are some features that you will only access with in-app purchases.

5. iAnnotate 4

iAnnotate 4 is the best solution to choose if you are looking for more than just a way to sign your PDF documents. It does everything you would expect a PDF app to do such as opening PDF documents, but it excels at annotation as the name suggests. Before we get any further on the features that iAnnotate has, it is important to note that this app is not free; you can purchase it for a one-time fee of US$9.99 and have access to all its features.

Once the PDF is open in iAnnotate 4, you can zoom in on any aspect of the document and then easily add your signature using the stylus or your finger. The PDF signature app also allows you to move and resize the added signature to ensure that it is just where you want it to be. You can also use the "Flatten" feature to compress the signature to prevent modifications in the future. Apart from adding a signature, you can also very easily use its many annotation features to markup, highlight text, and even add comments to the document.

Comparing 5 PDF Signing Apps

After navigating through the functionalities of all applications, we'll now assess their different aspects for a secure and enjoyable user experience. Each brings its unique strengths and streamlines the document signing process or ensuring the legitimacy of signatures. Let's explore a comprehensive comparison that aims to guide you in making a well-informed decision when selecting the most suitable PDF signing app.

MetricsUPDFPDF ViewerPDF ExpertPDF Pen 6iAnnotate 4
Electronic Signature
AI Features
Platform SupportAndroid, macOS, iOS, WindowsiPad, iPhone, Mac, and AndroidmacOS, iOSmacOS, iOSiOS

The above-mentioned comparison table highlights the exceptional capabilities of UPDF as compared to other applications. Now, let's discuss its additional advantages to justify its credibility for being a top pick for users.

  • Its complete functionality involves a robust set of features, from effortless document editing and secure signing to versatile page management.
  • UPDF provides a consistent and user-friendly experience across Windows, macOS, iOS, and Android devices.
  • With regular product updates, users benefit from the latest features, security enhancements, and performance optimizations.
  • The AI features enhance efficiency, providing smart suggestions and intelligent recognition of document elements.

We highly recommend you download UPDF now to make your documents secure through electronic signatures. Additionally, you can get extra perks and efficient features now at an incredible discount.


In conclusion, it is vital to sign a PDF electronically to maintain its integrity and authentication. When deciding on the best PDF signature app for iPhone and iPad in 2024, UPDF stands out among the top contenders. Its extensive functionality positions it as an exceptional solution for contemporary document management. Furthermore, UPDF also offers an impressive discount on its upgrade, presenting a budget-friendly option. So, enhance your PDF signing experience by downloading UPDF now.

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