Thank you for your patience.

After downloading

1. Open PNG77.apk from your downloads.
2. If Android asks, allow installation from this browser.
3. Tap Install, then tap Open.

Install on iPhone or iPad

Apple devices do not use APK files. Install PNG77 from Safari:

1. If needed, open this page in Safari.
2. Tap Safari’s Share button.
3. Choose Add to Home Screen.
4. Keep Open as Web App turned on if shown, then tap Add.