You can use any size paper. A good size for a standard bookmark is 15 by 15 inches (38 by 38 cm).

Make sure the corners are perfectly lined up before you crease the paper.

Try to align the edges to lie flush against each other. Avoid overlapping the edges or leaving a gap between them in the middle.

If you’re having trouble making a straight fold, place a ruler under the paper as you crease it to guide you and prevent any crooked folds.

If the corners aren’t folding up easily, go back and refold them to make the creases more flexible. To use your bookmark, slide the pocket onto the corner of a book page.

If you use things that could peel off, like glitter or glued-on paper, brush a thin layer of decoupage medium over it and let it dry completely before using. This will prevent the decorations from coming off. Avoid adding anything that’s too bulky to the middle of the bookmark since it will affect how the bookmark sits in your book. If you want to use something like pom poms or chunky rhinestones, for instance, attach them to the outside edges instead.

Check that your 2 folds intersect each other at the middle of the paper.

Take your time and line up the edge with the middle crease as perfectly as possible. Sloppy folds can ruin the project.

Avoid overlapping the edges in the middle or leaving a space between them. Try to get them to rest against each other.

Don’t let the tip go past the top edge of the paper or your finished heart won’t look right.

Make sure the crease in the center of the flattened triangle lines up with the bottom edge of the paper and that the 2 tips of the flattened triangles point towards each other.

For example, on the right flattened flap, fold the outer right corner up and in. On the left, fold the outermost left corner up and in.

You can fold the tips up more or less than 1⁄4 inch (0. 64 cm), depending on how you want to shape your heart. For instance, folding them up less will make the arches pointier, while folding them up more will make the arches flatter.

Avoid folding in the heart shape, created by flattening the flaps and folding them into triangles, during this step. Flip the paper over to see your finished bookmark! To use it, simply slip the page you want to mark underneath the bottom point of the heart.