How do you shrink crochet?

You shrink crochet mainly by felting, which works on animal fibers like wool. Washing the piece in hot water with agitation makes the fibers lock together and shrink into a denser, smaller fabric. Acrylic and cotton do not felt, so they shrink very little.

Can you shrink crochet that is too big?

Only to a limited degree, and only with the right fiber. Wool can be shrunk by felting, but acrylic and cotton resist shrinking. If a project came out too big, felting a wool piece can tighten it, but for other fibers you usually need to redo or adjust it.

Which yarn shrinks in crochet?

Animal fibers like wool, alpaca, and other untreated animal fibers shrink and felt with heat and agitation. Superwash wool, acrylic, cotton, and most synthetics are treated or made not to shrink, so they hold their size.

How do you felt crochet?

Felt crochet by washing a wool piece in hot water with some agitation, such as in a washing machine on a hot cycle, often with a little soap. The heat, moisture, and friction make the wool fibers mat together, shrinking and thickening the fabric into felt.

Does acrylic crochet shrink?

No, acrylic does not shrink or felt in normal washing, which is one reason it is so easy to care for. Very high heat can damage or distort acrylic, but it will not shrink it in a useful, controlled way.

How do I stop my crochet from shrinking?

Follow the yarn's care instructions, wash animal fibers gently in cool water by hand, and avoid hot water and hot dryers, which cause felting and shrinking in wool. Superwash wool and acrylic are safe from accidental shrinking.

Crochet Techniques

How to Shrink Crochet (Felting and Fixing Loose Fabric)

Published June 14, 2026

Shrinking crochet is something you might want to do on purpose, to felt a wool bag into dense, sturdy fabric, or something you are trying to avoid, when a project comes out too big or a wool piece shrinks by accident. Either way, it helps to understand how and why crochet shrinks, which comes down to the fiber. This guide explains how to shrink crochet through felting, which fibers shrink, and how to control it. It is part of the essential crochet techniques.

How Crochet Shrinks: Felting

The main way crochet shrinks is through felting, which happens to animal fibers like wool when they meet heat, moisture, and agitation together. The tiny scales on wool fibers lock into each other and mat together permanently, so the fabric shrinks and thickens into dense felt. This is why a wool sweater can shrink dramatically in a hot wash. Felting is the technique behind sturdy felted bags, bowls, and slippers, where crocheters shrink wool on purpose to create a firm, solid fabric that holds its shape.

Which Fibers Shrink

Fiber decides whether crochet will shrink. Untreated animal fibers, especially wool and alpaca, shrink and felt readily with heat and agitation. Superwash wool is specially treated so it does not felt, which is why it is machine washable. Cotton and plant fibers do not felt, though cotton can shrink slightly in high heat. Acrylic and most synthetics do not shrink or felt at all, which is part of why they are so easy to care for. So if you want to shrink crochet, you need wool, and if you want to avoid shrinking, choose superwash wool or acrylic. There is more on this in the wool yarn guide.

How to Felt Crochet on Purpose

To shrink wool crochet by felting, wash the finished piece in hot water with some agitation and a little soap, which you can do in a washing machine on a hot cycle or by hand in a basin, rubbing the fabric. Check the piece regularly, because felting is permanent and continues as long as you agitate, so you stop when it reaches the size and density you want. Felting shrinks the fabric and hides the individual stitches, turning it into solid felt. Make felted projects larger than the finished size you want, since they will shrink noticeably.

Can You Shrink a Project That Is Too Big?

If a project came out too big, whether you can shrink it depends on the fiber. A wool piece can be tightened by careful felting, though this also thickens the fabric and hides the stitches, so it changes the look. Acrylic and cotton resist shrinking, so a too big project in those fibers usually cannot be shrunk in a useful way, and you may need to adjust or redo it. To avoid this, always check your gauge before starting, as explained in crochet gauge problems, so projects come out the right size in the first place.

How to Avoid Accidental Shrinking

To keep crochet from shrinking by accident, match your washing to the fiber. Wash untreated wool and delicate animal fibers gently by hand in cool water, and never put them in a hot wash or a hot dryer, since heat and agitation cause felting. Superwash wool and acrylic are safe from accidental shrinking and can usually be machine washed. Always keep the care details from the yarn label so you know how to treat the finished piece, as covered in yarn care and washing. Good care keeps your projects the size you made them.

Common Mistakes

The most common mistake is expecting acrylic or cotton to shrink, when only animal fibers felt meaningfully. Another is felting too far, since the process is permanent and continues with agitation, so check often and stop in time. Accidentally felting a treasured wool piece in a hot wash is a sad but common mishap, which gentle cool washing prevents. And forgetting to make a felted project oversized leads to a finished piece that is too small. Understanding your fiber, from the types of yarn fiber guide, prevents most of these.

Shrinking With Control

Shrinking crochet is really about felting, which works on wool and other animal fibers through heat, moisture, and agitation, and barely affects acrylic and cotton. Felt wool on purpose for dense, sturdy bags and bowls, make felted projects oversized, and wash animal fibers gently to avoid shrinking by accident. For firming up decorative pieces without felting, see how to stiffen crochet, and explore more finishing skills in the essential crochet techniques guide.