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 ?
File compression and image compression are different things. In lossy image compression you throw out some data when re-saving the file and that’s not reversible; in file compression you don’t throw data out, so it’s reversible. It’s like rewriting a sentence in shorthand. All the information is still there, and if know the shorthand you can rewrite it back to plain English again (decompressing the file).