Before introducing the top 5 free PDF editor to you, you need to understand the key elements and core functions that the best free PDF editor should have.

- Cost savings: Time is money, and a free PDF editor should be equipped with simple and clear operations to achieve editing. Even without a guided tutorial, you can easily complete it.

- Diverse editing functions: Whether it is simply to merge and edit PDF, or even add filters to PDFs or image files. The more editing options you can implement, the more useful such a tool will be.

- No restriction on devices: Easily complete editing and annotation anytime and anywhere. This is the tool that can finally help you finish your work.

- User-friendly UI interface: A clean and uncluttered UI page can make users also feel comfortable. Therefore, a user-friendly enough to use the page, but also can not be ignored as a reference factor.

1. eScan

At the top of the list is eScan Scanner and Editor! As the name suggests, this tool allows users to easily perform various PDF editing operations and is available on iOS. However, the exciting aspect of this mobile app is that it can easily complete the scanning to create PDF files, various advanced editing options for PDFs as well as conversion of PDFs. Once you have it, you will have a one-stop shop for all operations related to PDF and other formats of files. Therefore, it is often considered as the best free PDF editor app for iPhone in 2023.

Key Features:

- PDF HD scanning and output

- Powerful editor that you can customize to edit PDF or various other forms of files

- Easily add electronic signatures and watermarks

- Can be saved in the cloud and easily shared with one click

2. iAnnotate

iAnnotate is a product that allows you to read and annotate PDF for free on your iPhone or iPad. You can complete PDF highlighting, drawing, marking, underlining, and more. It has a wide range of tools to not only edit PDF documents but also allow users to read PDFs easily. Overall, the application is easy to use and does not affect the performance of your phone.

Key Features:

- Read, annotate and share PDFs

- Support for customizing your annotation toolbar

- Use the full-screen mode that doubles as a presentation tool

3. Adobe Acrobat Reader

Adobe Acrobat Reader is also an old-school application that is available for both PC and mobile, and it is also a free PDF editor no sign up. You can view, create and annotate PDFs just like you would with Adobe Acrobat software on your computer. but unlike the desktop version, the Adobe Reader app is lighter and more flexible, and has many amazing features that let you annotate PDFs, highlight PDF files, fill out forms, sign documents and more while reading. However, its user interface can often be a headache.

Key Features:

- Highly reliable. Adobe's long-standing reputation makes it not easy to disappoint

- Ability to easily create PDF documents from scratch

- Versatile features

4. Small PDF

Small PDF is also a way worth trying. It has both a web version and a mobile version. The web version allows you to edit text online, add images, graphics, highlighting and hand-drawn annotations. With the web version you can upload a document and navigate to the "Edit" tab. Click on the text you want to edit and make changes. However, you may need to sign up for a 7-day free trial to use these features.

Key Features:

- Switch between tools and file types

- Provides two file compression modes

- Supports multiple file formats for conversion purposes

5. WPS Office

Although placed in the last recommendation. But WPS is also the choice of many people, especially for student community to find free PDF editor to download. Although very common, it has the power of an excellent editor. You are able to create, view and edit documents anytime and anywhere. One thing worth noting is that you may need to upgrade to a premium membership to avoid the WPS watermark on your documents when you output them after editing.

Key Features:

- With annotation tools to support PDF annotations

- It allows you to easily organize PDFs

- With powerful annotation and document page editing features