iPhone / iPad
Open Photos, tap Edit, choose Crop, then tap the flip icon for a left-right mirror.
Android
Open this page in your browser, choose an image from your device, and tap Horizontal or Vertical. Some gallery apps also include a Flip option in their editor.
Windows
Open the image in Paint. In the Rotate menu, choose Flip horizontal or Flip vertical, then save a copy.
Mac
Open the image in Preview and choose Tools → Flip Horizontal or Flip Vertical, then save.
Photoshop
Open the image, choose Image → Image Rotation → Flip Canvas Horizontal or Flip Canvas Vertical, then export a copy.
Canva
Select the image in a design, choose Flip in the editor toolbar, and pick Horizontal or Vertical before downloading.