This item is not replicated across Roblox’s server/client boundary.
This property can only be read from. Attempting to write to it will cause an error.
The read-only property TextBounds reflects the absolute pixel size of rendered text. In other words, if you were to try to fit text into a rectangle, this property would reflect the minimum dimensions of the rectangle you would need in order to fit the text.
TextService/GetTextSize, you can predict what TextBounds will be on a TextLabel given a string,
TextLabel/TextSize and frame size.
Dynamic TextBox Size
This code sample dynamically resizes a TextLabel, TextButton or TextBox to match the size of its TextBounds. Try changing the minimum width/height and pasting into a LocalScript in a TextBox.