Best 2023 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 a simple-to-use document manager and PDF signing app that allows you to manage most aspects of your PDF document on iPhone and iPad. It has numerous useful features that make it the only complete document management solution that you will ever need.

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pdf signature app updf

Above all, it comes with a very powerful freehand drawing tool that can be used to add a signature to any PDF document. With this drawing tool, you can simply select the section of the document where you'd like to add the signature and then use your finger or a stylus to draw in the signature.

The same freehand drawing tool can also come in handy when you want to draw markups on the document, add notes, or even draw a straight line. You can also use UPDF to create, merge, delete, and even rearrange the pages on any PDF document.

Supports Windows 7 or later100% secure

Supports macOS 10.14.6 or later100% secure

100% secure

100% secure

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.

pdf signing app pdf viewer

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.

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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.

free pdf signature app pdfpen

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.

free pdf signature app iannotate 4

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.


Are you still searching for the right way to sign a PDF on your iPhone or iPad? This article gives you a complete list of applications that can help you with this purpose. For the finest results, try using UPDF for iOS to sign your PDFs easily. You can also try other apps in the article to discover more depth to this particular operation.

Supports Windows 7 or later100% secure

Supports macOS 10.14.6 or later100% secure

100% secure

100% secure