Ever found yourself in need of a simple, yet sturdy envelope for your letters or cards? Look no further! Crafting a paper envelope with rectangle paper is an easy, eco-friendly, and satisfying task. In this guide, we'll walk you through the process step by step, ensuring you create the perfect envelope for your needs.

Before we dive in, gather your materials: a rectangle piece of paper (A4 or letter size works best), a ruler, a pencil, and a pair of scissors. You might also want to have a glue stick or a glue pen on hand. Let's get started!

Preparing Your Paper
The first step is to prepare your paper. If you're using a standard A4 or letter-sized paper, you're already good to go. However, if you want a specific size for your envelope, you can trim your paper to the desired dimensions. For a standard envelope, a rectangle measuring about 8.5" x 11.5" (A5 size) works well.

Using a ruler and a pencil, mark out the dimensions on your paper. Be sure to leave a little extra paper at the top for the flap. Once you've marked your lines, carefully cut along them using your scissors.
Folding Your Envelope

Now that you have your rectangle, it's time to start folding. The key to a sturdy envelope is in the folds. Let's break it down into simple steps.
Folding the Bottom
Start by folding the bottom of your rectangle upwards, creasing well along the edge. This will form the bottom of your envelope. Make sure the fold is neat and even.

Next, unfold your paper slightly, so you're left with a small triangle at the bottom. Fold this triangle upwards, creasing well. This will create a neat, reinforced bottom for your envelope. Set this aside for now.
Folding the Sides
Now, fold the left and right sides of your paper inwards, creating a long, narrow strip. The folded edge should meet the crease you made earlier for the bottom of your envelope. Crease well along these new edges.

Unfold your paper slightly, so you're left with a narrow strip at the top. Fold this strip downwards, creasing well. This will be the flap of your envelope. Make sure it's neat and even, as this will be the part that seals your envelope.
Assembling Your Envelope


















Your envelope is now essentially a long, narrow strip with a flap at the top. It's time to glue it together.
Using your glue stick or glue pen, apply glue along the inside edges of the two side folds. Be careful not to get glue on the outside of your envelope, as this could make it difficult to seal later.
Securing the Sides
Starting at one end, carefully fold one side of your envelope inwards, pressing the glued edge against the other side. Hold it in place for a few seconds to ensure a strong bond. Repeat this process with the other side.
Once both sides are glued and folded, you should have a neat, sturdy envelope. Allow the glue to dry completely before using your envelope to ensure it holds together well.
Sealing the Envelope
To seal your envelope, simply fold the flap downwards, pressing it firmly against the body of the envelope. If you've used a strong enough glue, this should be enough to keep your envelope closed. However, you can also use a bit of glue on the flap for extra security.
And there you have it! A simple, sturdy envelope made from a rectangle of paper. Whether you're sending a letter, a card, or a small gift, your homemade envelope is ready to serve its purpose.
Don't stop at just one envelope. Once you've mastered this technique, you can experiment with different paper types, colors, and sizes. You could even decorate your envelopes with stickers, washi tape, or drawings. The possibilities are endless! Happy crafting!