How to Sign "In" in American Sign Language

This guide covers the sign language sign for the word "in," not logging in to an account or app. It describes American Sign Language (ASL), the sign language most widely used in the US. Other sign languages, such as British Sign Language, are separate languages with their own vocabulary, so this description should not be assumed to carry over to them.

The short answer

In ASL, "in" is signed by placing the fingertips of your dominant hand down into an opening formed by your other hand, as if putting something inside a container. Your non-dominant hand is the container, and your dominant hand is what goes in.

Step-by-step: signing "in"

• 1. Choose your dominant hand. This is usually the hand you write with. It makes the movement. Your other hand stays mostly still.
• 2. Form the container with your non-dominant hand. Curve the fingers and thumb into a loose C or O shape so there is an opening at the top. Hold it in front of your chest with the opening facing up or angled toward your dominant hand.
• 3. Shape your dominant hand. Bring all the fingertips together so they touch the thumb. This is called a flat-O handshape, and it looks a little like a closed beak.
• 4. Point the dominant fingertips downward, directly above the opening.
• 5. Move the dominant hand down so the fingertips go into the opening of the container hand. Make one smooth, deliberate movement, then stop.

How to check that you are signing it correctly

• The non-dominant hand clearly shows an opening that something could fit into, not a closed fist.
• The dominant hand's fingertips are gathered together and pointing down before they move.
• The fingertips actually enter the opening rather than tapping the outside of the other hand.
• The movement is a single insertion, not a wave or a circle.
• Watching yourself in a mirror or a phone's front camera lets you compare your hands against this checklist. Keep in mind that a mirror or front camera may show a reversed image, so focus on shape and movement rather than which side of the image each hand appears on.

Self-checking confirms that your handshapes and movement match the description. It cannot confirm natural rhythm, regional preferences or whether a signer would read it the way you intend. Feedback from a fluent signer, a Deaf community member or a qualified ASL instructor fills that gap.

"In" versus "inside"

The sign for "inside" uses the same two handshapes and is closely related. Many signers show "inside" with a repeated dipping movement into the container hand, while "in" is often a single movement. Usage varies between signers and regions. If the difference matters for what you want to say, check a reputable ASL dictionary that shows video, or ask a fluent signer.

When ASL may not use a separate sign for "in"

ASL is not a word-for-word version of English. Location is often shown through space and hand placement. For example, to describe a cat in a box, a signer may set up the box in signing space and then show the cat's position relative to it, without a standalone "in" sign. Signing each English word in order can produce phrasing that looks unnatural to fluent signers. This is worth knowing if you plan to go beyond individual vocabulary.

Limits of this guide

No source materials, video references or regional usage data were supplied for this article. The description reflects the commonly taught ASL form and general principles of the language. A written description cannot fully capture movement and facial expression, so confirming the sign with a video dictionary or a fluent signer is the most reliable next step.