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There’s a quiet little wow when someone opens an invitation and finds a flash of pattern inside the envelope. That printed insert is an envelope liner. You can make DIY envelope liners at home with lightweight paper, a template and a few basic tools.
This guide covers the right paper, envelope liner sizes, printing, cutting and assembly. It also shows you how to make a custom liner for a different envelope size or flap shape.
What you’ll need
- Your envelope liner template, edited in Corjl
- Lightweight matte paper, 80–120 gsm
- Scissors or a paper trimmer
- A scoring board or bone folder for a clean crease
- Double-sided tape or a glue roller
- Your envelopes
- A piece of cardboard only if you need to make a custom stencil
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What paper should you use for envelope liners?
Print envelope liners on lightweight matte paper between 80 and 120 gsm. Ordinary printer paper sits well inside an envelope and folds neatly with the flap. Do not print the liner itself on cardboard or heavy cardstock. Thick paper can buckle, crack at the fold and make the envelope harder to close.
You can print at home or ask a local copy shop for lightweight matte paper. Print one test liner at 100% scale before printing the full quantity.
What size envelope liner do you need?
Choose the liner that matches your envelope and flap shape. Buy or measure the envelopes before printing, because two envelopes made for the same invitation can have different flaps.
| Envelope | Fits invitation size |
|---|---|
| A7 Euroflap | 5 × 7 in |
| A7 Euroflap Square | 5 × 7 in |
| DIN B6 | A6 (105 × 148 mm) |
Check the individual product description before choosing a size. The formats included can change from one envelope liner template to another.
How do you make a custom liner for a different flap?
If your envelope has a different size or flap shape, make a cardboard stencil from the envelope you will actually use:
- Open the envelope and trace its flap onto a piece of cardboard.
- Cut out the cardboard shape and test it against the envelope.
- Remove the cutting lines from your liner template in Corjl. Open the chat on this page if you need help doing that.
- Print the motif on lightweight matte paper at 100% scale.
- Place your cardboard stencil over the printed motif and trace around it.
- Cut out the liner, insert it and glue the top section as described below.
Keep the stencil for the rest of the envelopes so every liner has the same shape.
How do you make and insert envelope liners?
Edit and print the liner
Personalise the design in Corjl if there is text to change. Download it, then print on lightweight matte paper at 100% scale. Start with one test print and place it inside the envelope before printing the full quantity.
Cut it out
Trim along the guide lines. Cut a hair inside the line if needed. A liner that is slightly smaller will slide into the envelope, while one that is too large can buckle.
Insert the liner
Slide the liner into the open envelope with the patterned side facing you. Move it into position without forcing the paper against the sides.
Crease it with the flap
Fold the envelope flap down over the liner. This marks the fold in the right place. A scoring board or bone folder can help you make a crisp crease.
Add adhesive
Open the flap and add double-sided tape or glue to the top flap section of the liner only. The lower part should sit freely inside the envelope.
Press and finish
Press the glued section against the envelope flap, then fold the flap once more to check that it closes cleanly.
Set up a small assembly line. Print and cut the full batch first, then insert, crease and glue them in groups. It is quicker than finishing each envelope separately.
Envelope liner questions
What is an envelope liner?
An envelope liner is a decorative paper insert placed inside an envelope. The pattern appears when the flap opens and can match the invitation or add a separate detail.
Can you use cardstock for envelope liners?
No. Use lightweight matte paper between 80 and 120 gsm for the liner itself. Cardboard is only needed if you make a reusable stencil for a custom flap.
Do the liners come pre-cut?
No. This is a digital envelope liner template that you print and cut yourself.
Why do you glue only the top section?
The liner needs to move with the envelope flap. Gluing only the top keeps it in place while the lower section sits naturally inside the envelope.
What if my envelope has a different flap?
Trace your flap onto cardboard to make a stencil, remove the cutting lines from the template, print the motif and trace your stencil onto the printed paper. Open the chat on this page if you need help removing the lines.
Where can I print envelope liners?
Print them at home or ask a local copy shop for lightweight matte paper between 80 and 120 gsm. Print at 100% scale and test one liner before ordering or printing the full quantity. See the US and European paper-size guide if you need help with the sheet setup.
Ready to choose a design? Browse the envelope liner templates, then print one test copy before starting the full stack.
Prefer to watch? Here is the assembly in under a minute (sound on).
