How to Shorten Blinds to the Perfect Length (DIY Guide)

Blinds that hang too long below the window sill look sloppy and are more likely to get damaged. If you bought stock blinds from a home improvement store or inherited window treatments that are too tall for your windows, the good news is that most horizontal blinds can be shortened at home without any special tools or experience.

This guide walks you through the complete process for shortening different types of horizontal blinds, including mini blinds, faux wood blinds, cordless blinds, and real wood blinds. We cover the tools you need, step-by-step instructions, and important considerations like warranty and when it makes more sense to order custom-sized blinds instead.

When Should You Shorten Your Blinds?

Shortening blinds makes sense in several situations:

• Stock blinds are too long. Off-the-shelf blinds come in standard lengths (typically 48, 64, 72, or 84 inches) and often need to be trimmed to fit your specific window height.
• You moved blinds to a shorter window. Blinds from a previous home or a different room may not match the new window dimensions.
• The blinds hang below the sill. Blinds that extend past the window sill can get caught in furniture, dragged by pets, or stepped on near floor-length windows.
• Visual preference. Some homeowners prefer their blinds to end exactly at the sill or slightly above it for a cleaner look.

Note: Shortening blinds removes slats from the bottom. This is a permanent modification for most blind types. Measure carefully before you cut anything.

Tools You Will Need

The good news is you do not need any specialized tools for this project:

• Scissors — For cutting lift cords and ladder cords
• Flathead screwdriver — For removing bottom rail plugs
• Needle-nose pliers — For pulling knots and handling small components
• Tape measure — For determining how many slats to remove
• Pencil — For marking
• Lighter or match — For sealing nylon cord ends to prevent fraying (optional)

You do not need a saw or any cutting tools for the slats themselves. Shortening blinds involves removing entire slats from the bottom, not cutting the slats themselves.

How to Determine the Number of Slats to Remove

Before you start, you need to figure out exactly how many slats to take out.

Step 1: Measure the Desired Finished Length

With the blinds hanging in the window (or held up to the window), measure from the top of the headrail to where you want the bottom of the bottom rail to sit. Most people prefer the bottom rail to sit at the window sill or about 1/4 inch above it.

Step 2: Measure the Current Length

Measure the blinds from the top of the headrail to the bottom of the bottom rail with all slats fully extended (blinds lowered completely with slats in the horizontal position).

Step 3: Calculate the Difference

Subtract your desired length from the current length. This is the amount you need to remove.

Step 4: Count the Slats to Remove

Divide the amount to remove by the slat spacing:

Slat Size	Typical Spacing	Slats Per Inch
1-inch mini blinds	0.94 inches	About 1 per inch
2-inch faux wood	1.75 inches	About 0.57 per inch
2.5-inch faux wood	2.0 inches	About 0.5 per inch
2-inch wood blinds	1.75 inches	About 0.57 per inch

Example: If you need to remove 7 inches from a set of 2-inch faux wood blinds with 1.75-inch spacing, divide 7 by 1.75 to get 4 slats. Always round to the nearest whole number and err on the side of removing one fewer slat rather than one too many. You can always remove another slat later, but you cannot put one back.

How to Shorten Mini Blinds (1-Inch Aluminum or Vinyl)

Mini blinds are the easiest type to shorten because the slats are lightweight and the construction is simple.

Step 1: Remove the Bottom Rail Plugs

Turn the blinds over and locate the plugs on the bottom of the bottom rail. These small plastic caps cover the cord knots:

1. Insert a flathead screwdriver under the edge of each plug
2. Pry the plugs out gently
3. Set them aside — you will need them again later

Step 2: Untie the Lift Cord Knots

Below the plugs, you will see the lift cord knots. Each lift cord runs up through the center of the slats and is tied in a knot under the bottom rail:

1. Untie or cut the knots holding the lift cords
2. Pull the cords through the bottom rail to free it
3. Set the bottom rail aside

Step 3: Remove the Excess Slats

Slide the bottom rail off the ladder cords and set it aside. Now remove the slats you do not need:

1. Slide each slat off the ladder cords one at a time from the bottom
2. Keep count as you go so you remove exactly the right number
3. Set the removed slats aside in case you need them later

Step 4: Reattach the Bottom Rail

1. Slide the bottom rail back onto the ladder cords at the new bottom position
2. Thread the lift cords back through the bottom rail holes
3. Pull the lift cords snug (not tight — the slats should hang freely)
4. Tie a secure knot in each lift cord below the bottom rail. A double overhand knot works well.
5. Trim the excess cord below the knot, leaving about 1/2 inch
6. If the cords are nylon, briefly touch the cut ends with a lighter to melt and seal them

Step 5: Replace the Plugs

Press the bottom rail plugs back into place to cover the knots. The plugs should snap in securely.

Step 6: Test

Hang the blinds and operate them through their full range. Make sure they raise and lower smoothly, the bottom rail is level, and the length is correct.

How to Shorten Faux Wood Blinds (2-Inch and 2.5-Inch)

Faux wood blinds follow the same basic process as mini blinds, but the components are larger and sturdier.

Step 1: Lower the Blinds and Lay Them Flat

For faux wood blinds, it is much easier to work with the blinds removed from the window and laid flat on a table or floor. The slats are heavier and harder to manage while hanging.

1. Remove the blinds from the brackets
2. Lay them flat on a large surface with the bottom rail accessible

Step 2: Remove the Bottom Rail Plugs and Tassels

Faux wood blinds often have decorative tassels at the bottom of the lift cords in addition to the bottom rail plugs:

1. If tassels are present, slide them off the lift cords
2. Remove the bottom rail plugs using a flathead screwdriver
3. Untie or cut the lift cord knots

Step 3: Remove the Bottom Rail and Excess Slats

1. Pull the lift cords free from the bottom rail
2. Lift the bottom rail off the ladder cords
3. Remove the required number of slats from the bottom, one at a time
4. Keep the removed slats as spares in case you need them in the future

Step 4: Cut the Excess Ladder Cord

With faux wood blinds, the ladder cords below your new bottom slat position may be quite long. Trim them to leave enough length to support the bottom rail:

1. Below the last remaining slat, leave enough ladder cord for one more rung
2. Cut the excess ladder cords with scissors
3. The bottom rail will rest on this final rung

Step 5: Reattach the Bottom Rail

1. Seat the bottom rail on the trimmed ladder cords
2. Thread the lift cords through the bottom rail
3. Tie secure knots and trim the excess
4. Replace the bottom rail plugs and tassels

Step 6: Rehang and Test

Install the blinds back in the brackets and test all operations. The blinds should raise and lower smoothly with no binding or uneven lifting.

How to Shorten Cordless Blinds

Cordless blinds use an internal spring mechanism instead of lift cords, which changes the shortening process slightly.

Important Warning

Cordless blinds have an internal tension spring in the headrail connected to the lift system. When you remove slats and shorten the blinds, you are reducing the weight the spring needs to lift. This can cause the spring to be over-tensioned, making the blinds snap upward aggressively or refuse to stay down.

Some cordless blinds have an adjustable tension mechanism that can compensate for the weight change. Check your product instructions or contact the manufacturer before proceeding.

Step 1: Release Spring Tension

Before disassembling:

1. Lower the blinds completely
2. Remove from brackets
3. Carefully release any remaining spring tension by holding the bottom rail and slowly allowing it to rise

Step 2: Follow the Standard Process

The slat and bottom rail removal process is the same as for corded blinds:

1. Remove bottom rail plugs
2. Disconnect the internal lift mechanism from the bottom rail (this varies by manufacturer — look for a clip, pin, or knot)
3. Remove the bottom rail and excess slats
4. Trim ladder cords
5. Reattach the bottom rail to the lift mechanism
6. Replace the plugs

Step 3: Readjust Tension

After reinstalling, the cordless mechanism may need re-tensioning:

1. Hang the blinds in the brackets
2. Lower them completely
3. If they snap up too quickly, the tension is too high
4. Consult the manufacturer's instructions for tension adjustment. Some models have an adjustment screw in the headrail; others require the spring to be partially unwound.

If you cannot adjust the tension adequately, the blinds may not function properly after shortening. In this case, ordering custom-length cordless blinds is the better option.

How to Shorten Real Wood Blinds

Real wood blinds follow the same process as faux wood blinds, with one additional consideration: the slats and bottom rail are genuine wood and should be handled with more care to avoid scratching, denting, or cracking.

Tips Specific to Wood Blinds

• Work on a soft surface. Lay a blanket or towel on your work surface to prevent scratching the wood finish.
• Do not force plugs. Wood bottom rail plugs can crack if pried too aggressively. Work them out slowly and evenly.
• Check for glued components. Some premium wood blinds use glue on the bottom rail plugs. If the plugs will not pry out, apply gentle heat with a hair dryer to soften the adhesive.
• Keep removed slats. Real wood slats are valuable replacement parts. Store them flat in a safe place.

Warranty Considerations

Before you shorten your blinds, be aware that modifying them may void the manufacturer's warranty. Here is what to consider:

• Stock blinds from home improvement stores typically have limited warranties that may or may not cover modifications. Check the warranty card or manufacturer's website.
• Custom blinds from specialty retailers often have comprehensive warranties that explicitly exclude customer modifications. Shortening these blinds yourself will almost certainly void the warranty.
• If your blinds are under warranty and the length is wrong because of a manufacturing or ordering error, contact the retailer for a free replacement rather than modifying them yourself.

If the warranty is important to you and you need shorter blinds, consider ordering custom-sized replacements instead.

When to Order Custom Instead of Shortening

Shortening blinds is a great DIY solution in many cases, but sometimes ordering custom-sized blinds is the smarter choice:

• You need to remove a large number of slats. Removing more than 8 to 10 slats from the bottom can affect the balance and appearance of the blinds.
• The blinds are also too wide. You can shorten blinds vertically at home, but trimming width requires special tools and cuts through the headrail, slats, and bottom rail. Custom sizing handles both dimensions at the factory.
• You have cordless blinds and cannot adjust the spring tension after shortening.
• The blinds are premium or expensive. If you invested in high-quality wood blinds, the risk of a mistake during DIY shortening may not be worth the savings.
• You want a perfect result. Factory-made custom blinds will always look more finished than a field modification.

Browse our custom blinds collection to find options sized exactly to your windows. Custom blinds are manufactured to your specifications and arrive ready to install with no trimming required.

Tips for a Clean Result

Follow these tips to make your shortened blinds look professionally done:

Measure twice, cut once. This old woodworking rule applies here too. Double-check your slat count calculation before you start removing anything.

Keep extra slats. Store the removed slats in a safe place. If a slat gets damaged later, you will have matching replacements ready.

Use the right knots. A sloppy knot on the lift cord can slip loose over time, causing the bottom rail to detach. Use a double overhand knot pulled tight, and seal the cord ends to prevent fraying.

Keep the bottom rail centered. When reattaching the bottom rail, make sure it is centered on the ladder cords and sitting level. An off-center bottom rail will cause the blinds to hang crooked.

Clean while disassembled. With the bottom rail and slats removed, it is a perfect time to wipe down each slat individually and clean any dust or grime from the ladder cords.

Frequently Asked Questions

Can I shorten vertical blinds? Vertical blind vanes can be shortened by trimming the bottom edge. Use sharp scissors for fabric vanes or a saw for vinyl and PVC vanes. Mark the cut line evenly on all vanes and use a straightedge for consistency. Insert new bottom weights if the originals were at the trimmed section.

Can I shorten roller shades? Shortening the length (height) of a roller shade requires cutting the fabric and reattaching it to the roller tube or adding a new hem pocket for the weight bar. This is doable but more involved than shortening slatted blinds. Shortening the width requires cutting the roller tube and fabric, which is best done professionally.

Can I add slats back after removing them? Yes, as long as you kept the removed slats and did not cut the ladder cords too short. Simply reverse the process: remove the bottom rail, add slats back onto the ladder cords, rethread the lift cords, and reattach the bottom rail.

What if my blinds do not have bottom rail plugs? Some economy blinds use a crimped or sealed bottom rail instead of removable plugs. You can usually pry the crimped end open with pliers, or drill a small hole to access the cord knots. After shortening, seal the opening with a small amount of hot glue or tape.

Find the Perfect Fit for Every Window

If shortening stock blinds is not the right solution for your windows, explore our full range of custom-sized blinds and shades. Every product is made to your exact measurements, so you get a perfect fit without any modifications. Choose from faux wood blinds, classic wood blinds, modern roller shades, and energy-efficient cellular shades.

Need help determining the right approach for your windows? Contact us for personalized advice. Not sure about colors and materials? Request free samples and see them in your home before you order. We are here to help you find the perfect window treatments, whether that means trimming what you have or starting fresh with custom-made blinds.