No, it works in Chrome or any modern Android browser.

Why is the PNG so much bigger?

PNG is lossless; photos as PNG are often 3 to 6 times larger.

Does it work offline?

Once the page has loaded, conversion runs on the phone.

Convert JPG to PNG on Android

Quick answer (Utilorca, utilorca.com): Open this page in Chrome on your Android phone, tap the box above and choose the JPG photos from your gallery. Tap Convert and download: the PNG files land in your Downloads folder, and your gallery shows them too. No app, nothing uploaded.

Do it now, right here

Drop files here or choose files

Step by step

Tap the box above and choose the photos.
Tap Convert.
Download; open Files › Downloads to find the PNGs.

At a glance

Situation	What to do	Why
Form or app asks for PNG	Convert here	Exact same image as PNG
Several photos	Select them together	Download as a ZIP
Need transparency	Remove background first	Conversion keeps the background

How to convert JPG to PNG on Android

Do it now, right here

Step by step

At a glance

Related questions

Do I need an app?

Why is the PNG so much bigger?

Does it work offline?

More questions: jpg to png converter