5 Best PDF Compare Tool for 2026, Including Freeware
Editor's notes on Feb 20th, 2026: DiffPDF was on the top list for a long time, but since 2025, DiffPDF version 6.2.0-pe, the final version of DiffPDF is longer [...]
How to Unredact PDF on Windows or Mac?
When you open a PDF, you find some texts are blacked out, you are blocked out of some important information, and want to get rid of it. If [...]
10 Best PDF Measuring Tool for 2026, Including Free
Sometimes we just need a quick measurement on a PDF drawing file and PDF measuring tools provide the best way to do that. These tools simply measure the [...]
4 Ways to Edit PDF Text with Same Font 2026 (Online Free)
It might happen to you like this: you download the free trial of a PDF editor that boasts itself in good price and powerful features, then open your [...]
4 Ways to Add GIF to PDF, including Animated GIF
PDF users are keen to add interactive objects into a PDF, like audio, video or gif, because it add something creative to the files. Today in this post, [...]
5 Ways to Add Audio to PDF 2026 (Tested and Playable)
Our workplaces are getting smarter and smarter, thanks greatly to the prevalence of digital documents like PDF. We can edit text, image, url, add buttons, execute actions, embed [...]
How to Remove Any Watermark from PDF Easily (Online Free)?
Watermark is added to prevent someone from stealing your work and claiming them as their own. If you have a good and legal reason to remove watermark from [...]
How to Create Table of Contents in PDF on Mac or Windows?
A table of contents is created to give an outline and display the structure of a lengthy document. It is common to add a table of contents in [...]
3 Ways to Change Default PDF Viewer on Mac (Sonoma and Earlier)
It is a commonsense understanding that we all need a PDF viewer to open and view a PDF file on Mac. What is the default PDF viewer on [...]
What is and How to Use Preview on Mac: Update to Sonoma
What is Preview on Mac? There are still a part of our Mac users just taking Mac Preview as a simple PDF Reader, or PDF annotator at most. [...]