Default apps, explained
How to change which app opens your files and links, with and without Defaultify.
Mac
Change the default app for a file type
Make every .json, .md or .pdf open in the app you want, using Finder or Defaultify.
Change your default browser
Switch from Safari to Chrome, Brave, Firefox or Arc, and what else moves with it.
Change your default email app
Make mailto: links open Outlook, Gmail in a browser, Spark or Proton Mail.
Stop apps from changing your defaults
Why installers and updates take over file types, and how to catch it.
Android
Find which app opens a file type
Android has no list of file-type defaults. Here's how to track down the app that opens your PDFs or videos.
Files keep opening in the wrong app
Find the hidden “Always” choice, clear it and pick the right app.
The “Open with” menu doesn't appear
The three reasons Android stops asking which app to use, and how to get the choice back.
Links open in an app instead of the browser
Why YouTube or Amazon links jump into apps on Android 12+, and how to control it.
Change default apps on Android
Browser, phone, SMS, launcher and the apps that open your links and files.
Change default apps on Samsung Galaxy
One UI's menus for default browser, messages and home screen, and Samsung's duplicate apps.
Reset app preferences: what it does
The one-tap way to clear every default, what else it resets, and safer alternatives.