If you don't want to install an app, use reputable browser-based resizers (like Adobe Express or Canva) that don't require an APK download. Final Thoughts
A picture resizer needs access to your "Files and Media." It does not need access to your Contacts, SMS, or Location. If it asks, delete it immediately.
Sideloading is the process of installing an app from an unofficial source. While it has legitimate uses for developers, for the average user, it opens the door to:
Your microphone, camera, and GPS can be accessed without your knowledge. How to Stay Safe
These APKs frequently request "Overlays" or "Accessibility Services." Once granted, they can record your keystrokes, capturing passwords for banking apps and social media. The Risks of "Sideloading" Unverified Apps
If you’re looking for a way to resize your photos, the safest path is the most boring one: