Pressing the wrong key takes a second; the panic that follows lasts much longer. The good news is that computers and phones rarely destroy a deleted item right away. They park it somewhere for a while, and during that window you can bring it back yourself, without installing anything extra.
This guide covers only the recovery paths built into your operating system and the services you already use: the Windows Recycle Bin and previous versions, OneDrive, Google Drive, Google Photos, the Recently Deleted album on iPhone, your phone gallery's own trash, and the WhatsApp backup. The steps start with the easiest and most effective option.
One rule comes before all of them: stop using the drive or phone that held the file. Microsoft states it plainly โ the space a deleted file used is marked as free space, and any use of the computer can create new files that overwrite it.