How to Fold Your Own Envelope from Paper

What You’ll Need

A rectangular sheet of paper, such as printer paper or lightweight craft paper
A ruler, if you want help making even folds
A pen or pencil, optional, for marking fold lines
Clear tape, a sticker, or glue to secure the envelope
A letter or card to check the size

This method makes a simple envelope from one rectangular sheet without a template. Before folding, check that your paper is wide enough for the item and that the folded sides will overlap slightly. If you plan to mail the envelope, check the postal service’s current size, thickness, addressing, and sealing requirements; a handmade envelope may need extra reinforcement or a standard outer envelope.

Step-by-Step

Place the paper landscape. Set the rectangular sheet on a clean, flat surface with its longer edges running left to right. Put the side you want to show on the outside face down. Keep the paper straight so the folds will line up.
Center the item as a size check. Place your note or card near the lower half of the sheet. Leave enough paper at the bottom to fold over the item and enough at the top to make a closing flap. The paper should extend beyond both sides of the item so they can fold inward and overlap a little.
Fold the bottom upward. Remove the item, then bring the bottom edge up over the lower portion of the space where the item will sit. Make the fold high enough to cover the item when it is inside, while leaving a generous strip of paper above for the flap. Crease the fold firmly with a fingertip or the edge of a ruler.
Fold the left and right sides inward. Fold each side toward the center so the edges overlap by about half an inch, or enough to form a continuous seam. Adjust the folds to make the inside pocket just wider than the note or card. Check that the two side flaps are similar in width and crease them sharply.
Secure the side seams. Apply a narrow strip of tape over the overlapping edges, or use a small amount of glue between them. Keep adhesive away from the inside space where the note goes. If using glue, press the seam flat and let it dry according to the product instructions before inserting anything.
Insert the note or card. Slide the item into the pocket with its lower edge resting near the bottom fold. Make sure it lies flat and does not push the side seams apart. If it is a tight fit, take it out and widen the pocket by refolding the sides slightly farther from the center.
Fold and seal the top flap. Bring the top edge down over the opening, then crease it. Trim the flap only if it is much longer than needed, leaving enough to cover the opening. Secure it with a sticker or a small piece of tape; use glue if you do not need to reopen the envelope.

Common Mistakes

Starting with paper that is too small: The side folds may not meet, or the flap may not cover the opening. Check the paper against the item before making permanent creases. Choose a larger sheet if the sides cannot overlap.
Making the pocket too narrow: The note may buckle or tear as you insert it. Leave a little clearance on each side, then test the fit before sealing the flap.
Folding uneven side flaps: One side may stick out or the envelope may twist. Align the paper edges with a ruler or use the item itself as a guide when checking the pocket width.
Putting adhesive inside the pocket: Glue or tape can catch the note, mark it, or make insertion difficult. Apply adhesive only along the overlapping side seams and keep it near their outer edges.
Using too much glue: Excess glue can wrinkle lightweight paper and take longer to dry. Use a thin line, press gently, and allow it to dry before loading the envelope.
Leaving the flap too short: A small flap may not cover the opening securely. Check its reach before trimming or sealing, and leave enough material to fold over the pocket.

Tips

Make a test envelope from scrap paper first if the finished one needs to fit a particular card.
For crisp folds, line up edges carefully and press each crease from the center toward the corners.
Use lightweight paper for easier folding. Very thick or textured paper can be harder to crease and may not seal neatly.
If the envelope will hold several sheets, test it with the full contents before sealing. Add a little extra width and depth so the seams are not under strain.
Decorate the outside before folding if drawing on a flat sheet is easier, but keep addresses and postage areas clear if mailing it.
For a tidy finish, place a small piece of tape over each side seam on the outside, rather than covering the whole envelope.

Troubleshooting

The side edges do not overlap: Unfold the paper and start with a wider sheet, or make narrower side folds. The seams need to meet or overlap slightly to keep the contents inside.

The paper tears at a crease: The paper may be too thick, brittle, or sharply forced. Flatten the sheet, choose a more flexible paper, and make the fold gradually. If the tear is small, reinforce the area with tape on the outside.

The envelope will not lie flat: Check that the side folds are straight and that the item is not too bulky. Remove the contents and flatten the creases again; if needed, make a wider pocket or use a larger sheet.

The flap keeps opening: Add a sticker or a short piece of tape. If you used glue, make sure it has dried and that the flap overlaps the pocket opening enough to stay in place.

The note catches on an edge: Smooth any rough or uneven folds, and check for adhesive inside the pocket. Widen the opening slightly if the note still catches.

Frequently Asked Questions

Can I fold an envelope without glue or tape?

Yes. Fold the side edges inward and tuck one side flap under the other where they overlap. Fold the top flap down and tuck its tip into the pocket if the paper allows. This is less secure than sealing the seams.

What size paper should I use?

Use a sheet that is wider than the item by enough to allow both side flaps to overlap, with extra length for the bottom pocket and top flap. Test the layout before creasing; there is no single size that fits every card or note.

Can I use regular printer paper?

Yes. Standard printer paper is flexible and easy to fold for a lightweight note or card. If the envelope feels flimsy, use heavier paper or reinforce the seams with tape.

Can a handmade paper envelope be mailed?

Possibly, but mailing rules vary. Check your postal service’s requirements for dimensions, thickness, shape, address placement, postage, and closure before sending it. Reinforce seams or place the handmade envelope inside a standard mailer if needed.

How do I make the envelope fit a folded letter?

Fold the letter first, then use it to check the pocket size. Leave a small amount of clearance around it so it slides in and out without bending, and make the top flap long enough to close over the opening.

Sources: United States Postal Service. Menus and buttons can differ slightly by version. Spotted something out of date? Tell us.