How to fold the birthday gift box is as follows:

1. First, take a square piece of paper, and then fold it in half, up and down, left and right, respectively, to make two creases as shown in the figure.

2. Fold the upper and lower sides to the center line along the dotted line shown in the figure.

3. Fold it like this and then open it to form two new creases.

4. Then, fold the upper and lower edges to the crease just now, as shown in the figure below.

5. After folding in the previous step, fold the four corners back. When folding back, one edge should coincide with the two creases in the previous step. The red line in the figure shows the creases formed in the previous step.

6. At this time, turn to the back, and then fold the upper and lower parts to the middle along the broken line in the figure.

7. Fold the two parts shown in the figure to the edge along the dotted line.

8. The part enclosed in red circles in the first picture should be treated in the way shown in the second picture, that is, the part folded inside should be folded out.

9. The effect after all processing is as shown in the figure. At this time, turn to the front.

1. Fold a part of the back to the front along the dotted line, and the folded effect is shown in the second picture.

11. As shown in the figure, fold these four creases in the longitudinal direction. Pay attention to the relative positions of the creases, and don't fold them off.

12. Then fold one side like this. The red line in the picture is the position of the four creases in the previous step.

13. Fold both sides to look like a box, and then fold the excess part back as the lid of the box.

14. Seen from the side, the box looks like this, and the red circle indicates the positions of the four creases folded in step 11.

15. At this point, the gift box is folded.