Glenn FleishmanSenior Contributor, Macworld

Glenn Fleishman is the author of dozens of books, including Take Control of Wi-Fi Networking and Security (updated for iOS/iPadOS 13 and Catalina), a detailed guide to wireless networking and security. He's a senior contributor to Macworld, where he writes Mac 911.

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How to set a higher dpi without changing an image’s resolution

Resolution and pixel density are two separate factors often blurred into one.

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Can’t erase your Mac’s startup disk? Try Internet Recovery as a last resort

You might be trying to erase the recovery partition, which you can’t do. Here’s how to erase the disk.

imac steam 2019

How to delete large files for Steam and other apps

Some items macOS identifies as apps are actually files used by other apps, and can only be deleted within those programs.

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Use TripMode to press pause and conserve data on iCloud and other sync over a cellular hotspot

Apple omits a pause button, but this third-party utility can help.

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Can’t download an app update? It might be time to update your Mac

If you’re using an older version of macOS, you may run into problems when trying to install the latest version of an app.

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Recover messages from a deleted mail account in Mail for macOS

Messages may be a little hard to find, but you should be able to get them back in many cases.

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How to make FileVault work again when you’re missing a 'secure token'

A long-running problem appears to have a solution.

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Why use both Text Message Forwarding and Messages in iCloud?

The two separate features fulfill slightly different functions.

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Can’t import a .peg file? Use the Image Capture app

An old oddity seems to block certain file imports from iOS devices.

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How to simulate master page text guides in Pages for macOS

An odd omission can be simulated through master pages.

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Wrong time zone shown in Photos in iOS? It’s a timely bug

iOS currently displays the relative time at which a picture was taken.

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Moving to a new country? What you need to know about your Apple ID and app purchases

An Apple ID is tied to the country in which your payment method sends its bills.

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What iTunes means when it tells you deleted songs might not be moved to the Trash

The dialog box when you delete music within iTunes has so many provisos, it’s hard to know what the outcome will be.

ios iphone offload apps setting

Why iOS offloads apps and how to reinstall them

Apps can be automatically or manually put into a kind of standby mode.

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New Safari feature blocks purchase-tracking by ad clicks

Now in the developer preview of Safari, Privacy Preserving Ad Click Attribution decouples a click from an ecommerce action.