I was thinking of renaming every images extension to PNG but as my lap is crapped out and i am broke as hell i would have to do it on phone is there any good app on fdroid that can do it in a bulk ? Also does renaming the end from “jpg” to “png” actually change the format ? This pictures are very important to me as they have an imotionall connection to me.
On a less important is this the same for mp3’s too as i save my favourite songs in the same way as a zip file is m4a better ?
As others have pointed out simply copying the file, or compressing it in a zip will never ever change it. It is fundamentally the exact same file. If you load it up in a photo editor (not just viewer), and resave it from there, then it might lose more quality.
Renaming it to png changes essentially nothing about it. Most software will still recognize that it’s a jpg, and open it up as such. If they tried to open it as a png, they would fail. If you load the jpg into a photo editor and save it as png from there then it will actually change formats. But there is no point in doing this. The png’s file size will be much larger, and you can not get any of the quality back that you lost when initially saving it as a jpg.