When you paste text into Sketch it is usually inserted with the exact same styling as the source material. So for example if you copy red text with a size of 18px and italic styling, that’s exactly what you get when you paste it inside Sketch. However there are a couple of ways to prevent this behaviour and get unstyled text:
- Without a text layer: Directly paste the text onto the canvas without adding a text layer first: just press cmd + V.
- Inside of a text layer: Press shift + alt + cmd + V to paste the text.
- Permanent: Go into the Preferences (cmd + , or Sketch > Preferences from the menu bar), navigate to “Layers” and check “Strip Text Style when pasting”.