If you want to save the changes, you are creating a modified PDF file. If you don’t want to save the changes, don’t save them when you close the editor (a lot of browsers could do this, aside from open PDF editors). There are ways to overwrite file changes too, to reset files to their original.
If you are concerned for the original, use backup copies.
If you want to save the changes, you are creating a modified PDF file. If you don’t want to save the changes, don’t save them when you close the editor (a lot of browsers could do this, aside from open PDF editors). There are ways to overwrite file changes too, to reset files to their original.
If you are concerned for the original, use backup copies.