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Dennis Sellers

Dennis Sellers
488 posts
Contributing Author
Dennis has over 40 years of journalism experience and has written hundreds of articles. For the past 20-plus years, he's been an online journalist, covering mainly Apple Inc. He's written for MacCentral, MacWorld, MacMinute, Macsimum News, Apple Daily Report, and is now contributing editor at Apple World Today.
PDF document icon on Mac

Quick Tip: How to Sign a PDF in macOS Catalina Mail

Like me, you've probably had a PDF emailed to you that you need to sign. It’s a pain to print it, sign it, then scan it in order to send it back. Thankfully, there’s a better way. You can actually sign it right in the Mac Mail app.

Mac night Shift Logo with text saying "Night Shift"

How to Use Night Shift in macOS Catalina

macOS’s Night Shift is a feature brought over from iOS starting with macOS High Sierra. It helps you reduce the amount of blue light you're exposed to during the evening by shifting the display of your Mac to a more...

Collections of favicon images

How to Enable and Disable Favicons in macOS Catalina

With macOS Mojave, Apple has added support for favicons (short for "favorite icons”) in Safari tabs. Favicons are those little icons that let you quickly identify which of your open tabs is which website. A favicon is a file containing...

Screenshot of Mac Desktop with the word "Stacks"

How to Use Desktop Stacks in macOS Leopard Through Catalina

"Stacks" is a feature introduced in macOS Leopard (although the official name at the time was Mac OS X Leopard). It was available in the Dock, but nowhere else. The feature "Stacked" files into a small organized folder on the...

Mac Safe Mode Startup Screen with text saying "Safe Mode"

How to Use Safe Mode in macOS Catalina

Your Mac has a "Safe Mode" designed to help when you run into trouble with your computer. It's a diagnostic mode of macOS that boots up your desktop or laptop without any other apps running. Here's how it works.

macOS Utilities Window

How to Use macOS Recovery in macOS Catalina

macOS Recovery is part of the built-in recovery system of your Mac. It can help you restore data from Time Machine, reinstall the operating system, get online help online, repair or erase a hard disk, and much more. You can start up from macOS Recovery and use its utilities to recover from many types of software issues or take other actions on your Mac such as...

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