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Let's say you have a text with a background, but you want the background to automatically change size when you're changing the text. In this video, I'm going to show you how you can achieve this using a text layer and a shape layer.

First, create a shape layer by rightclicking in the timeline window, go to "New" and click "Shape Layer". Then draw out a shape in the composition window. You can adjust the size and color later.

Now, create a text layer by rightclicking in the timeline window, go to
"New" and click "Text Layer". Type a word in that text layer so that you can see it in the composition window. Make sure the text layer is placed above the shape layer in the timeline window.

Now go to Shape Layer, Contents, Rectangle 1, Rectangle Path.
Here, you want to add 2 expressions.

Hold down alt or option while clicking the stopwatch next to "Size".
Copy and paste the "Sizeexpression" from the video description below into this text field. Replace the text that is already in there.

Make sure to change the example text to the exact name of your text layer. Notice that this is case sensitive, so use uppercase and lowercase letters accordingly.

Now when the rectangle size matches the text, we need to adjust the position of the rectangle.

If you want a centeraligned text, just drag the rectangle into place,
go down to "Stroke" and change "Stroke width" to what you prefer
and just set the stroke color to the same color as the rectangle itself.

Using a stroke will make sure the rectangle grows proportionally to the text, instead of exponentially to the text, as it would do if you just resized the rectangle. (And I will show another handy little tip at the end of this video.)

If you want a leftaligned text, you have to do 2 more things. First, select the "Text Layer", go to the "Paragraph" window, and click "Left align text".
The second thing you have to do is to go back to the Shape Layer and down to Contents, Rectangle 1, Rectangle Path, and Position.

Hold down alt or option while clicking the stopwatch next to "Position".
Copy and paste the "Positionexpression" from the video description below into this text field and replace the text that is already in there.

Now just drag the rectangle into place, go to "Stroke" and change "Stroke width" as I should you before, and a bonus tip, if you want rounded corners, set "Line Join" to "Round join" and if you want it to be even more round, go up to "Rectangle Path" and increase "Roundness".

Expressions Used

SIZE:

s =thisComp.layer("Example123");
x = s.sourceRectAtTime(times.inPoint,true).width;
y = s.sourceRectAtTime(times.inPoint,true).height;
[x,y]

POSITION:

content("Rectangle 1").content("Rectangle Path 1").size/2

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