photo editors — different tiers, in case you want to do some simpler or more complex editing

• Easy tier — Whatever came with your OS, e.g. Microsoft Paint
• Medium tier — Pixlr Editor
  • Note that you don't have to create an account with them in order to save all your progress. You can save locally the file in .PXZ format, and this preserves your layers and other "Pixlr native" information. This allows you to later continue where you left off.
• Most complex tier — Gimp, Photoshop, etc