Slimline Cards & Envelopes Measurements & Templates

·      What Are Slimline Cards?

·      Tell me the size of a Slimline Cards?

·      Are there envelopes for Slimline Cards?

·      What Supplies Do I Need For Slimline Cards

·      How do I cut a Slimline Card Base:

Whether you are a seasoned card maker or a beginner, slimline cards are “in” right now.  For those of us who have been making cards for 20+ years it is a return of an old favorite but for the rest of you this is a new craze.  Either way, I love to make slimline cards as it is just a way to get away from the standard A2 card that we usually make and it opens up a whole new world of creativity.

In this article I will try to answer some of the questions you may have about slimline cards:

·      What are Slimline Cards?

·      What size are slimline cards?

·      Measurements for Slimline Card Base?

·      How much postage is required for a Slimline Card?

·      What size envelopes are needed for Slimline Cards?

·      What supplies do I need for Slimline Cards?

What Are Slimline Cards?

Slimline cards are cards that are long and slim or tall and slender.   They provide a different landscape to build upon and have more room for larger dies and sentiments.  More products related to the slimline card are popping up all the time.

What Size are Slimline Cards?

Slimline cards are most often 3.5 x 8.5 but can also be made 4 x 9.25.  Either way they will fit in a #10 business envelope which measures 4.125 x 9.5.   

Cutting a Slimline Card Base

For a 3.5 x 8.5 base card cut from an 8.5 x 11 piece of card stock

Portrait Mode Template:

Landscape Mode Template:

Just as with any card you can cut mats to leave a 1/16” or 1/8” border around your mat and combine the two sizes as well.

Base Card

Layer One Mat


3.5 x 8.5

3.25 x 8.25

Leaves 1/8” border around the mat

3.5 x 8.5

3 3/8 x 8 3/8

Leaves a 1/16” border around the mat

You can layer down multiple mats either ¼” or 1/8” at a time.  For instance cut your layer one mat 3.25 x 8.25 and then layer a second mat on top 3 x 8.  You can also cut the second mat for a more narrow border at 3 1/8” x 8 ¼”.

Cost to Mail Slimline Cards

The good news here is that if you are using a #10 business envelopes standard postage rates apply.  So unless your card is very thick or heavy a regular stamp will do. 

According to the USPS website: To be eligible for mailing at the price for letters, a piece must be: RectangularAt least 3-1/2 inches high x 5 inches long x 0.007 inch thick. No more than 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick. 


As I’ve already stated a standard #10 envelope will work and requires only regular postage.  If you are making your own envelopes there are dies out there that you can get to cut them out for you.

And if you are making standard slimline cards there are also envelopes available in a variety of colors through online shopping.

If you choose to cut your own it really is quite easy.  You will need an envelope 1/8” larger than the card so for a 3.5 x 8.5 card your finished envelope needs to be 3.5/8 x 8.5/8 Depending on the size of your slimline card you may need to use 12 x 12 paper.









This template can be used to make an envelope for a 3 7/8 x 9 slimline card.


Following the example above as to score marks, cut aways etc. the way to determine your template size and score marks for any size slimline card is:

1.   Determine the finished size of your card

2.   Add 4.75” to the width and 2.25” to the length, this measurement is the size of paper needed for the envelope.

3.   Score 2” lengthwise from the left edge, score 2.5” from the right side lengthwise

4.   Score 1.5” from the top and .5” from the bottom

5.   Cut away the corners, round and trim the tabs, fold and assemble.



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