Does my avatar need all 102 keys?

No. VRChat says that not every tracking key needs a blendshape and that most avatars support only a part of them. Keys without a blendshape simply do nothing.

Do capital letters matter?

Yes. VRChat matches blendshapes by exact name. "jawopen" is not "JawOpen". FaceKeys Check points out names that are almost right.

Is MouthSmileLeft one of the keys?

No. The 102 keys are base shapes. A smile is MouthCornerPull plus MouthCornerSlant on each side. The ARKit shape mouthSmileLeft covers both.

The character's own left. On screen, facing the avatar, that is your right.

Are the visemes part of the 102?

No. The 15 visemes (vrc.v_aa and so on) are separate. VRChat can route them through the same Face Tracking section when LipSync Mode is set to Viseme Blend Shape Face Tracking.

What do I need to be tracked?

VRChat names two sources: Selfie Expression, which uses a webcam on a desktop PC or the camera of an Android phone or tablet, and external apps that send data over OSC.

Yes, freely, for anything. The key names are VRChat's. The descriptions are ours and you may reuse them.

Meshwright guides › VRChat face tracking shape keys: all 102 names

VRChat face tracking shape keys: all 102 names

VRChat's built-in face tracking moves an avatar's face from 102 tracking keys. They are the base shapes of Unified Expressions. This page lists all 102 in VRChat's order, says in plain words what each one does, and shows the ARKit (Perfect Sync) shape it belongs to. Names and order were checked against VRChat's documentation on 13 November 2026.

Download the CSV Check my avatar (free add-on)

How VRChat uses these names

Face tracking is set up in the Face Tracking section of the VRC Avatar Descriptor.
Use All Tracking Keys exposes the full set of keys and marks the avatar as supporting full face tracking.
Auto-Fill Blendshapes maps blendshapes whose names match common face tracking standards to the tracking keys. You can also pick a blendshape for any key by hand.
VRChat matches blendshapes by exact name, on up to 16 meshes. Spelling and capital letters count.
Not every key needs a blendshape, and several keys can share one. Most avatars support only a part of the 102.
Tracking data comes from Selfie Expression (a webcam on a desktop PC, or the camera of an Android phone or tablet) or from an external app over OSC.
Basic face tracking needs no custom synced parameters.

Source: VRChat Creator Docs, Face Tracking and OSC Face Tracking (page dated 29 Oct 2026).

The 102 tracking keys

Order as in VRChat's documentation. Left and Right mean the character's own left and right. The short descriptions are ours. The names are VRChat's.

No.	Tracking key	What it does	ARKit shape (Perfect Sync)	FaceKeys 2.1
1	`EyeLookOutRight`Eyes	right eye looks outward, away from the nose	`eyeLookOutRight` same shape	✓ made
2	`EyeLookInRight`Eyes	right eye looks inward, toward the nose	`eyeLookInRight` same shape	✓ made
3	`EyeLookUpRight`Eyes	right eye looks up	`eyeLookUpRight` same shape	✓ made
4	`EyeLookDownRight`Eyes	right eye looks down	`eyeLookDownRight` same shape	✓ made
5	`EyeLookOutLeft`Eyes	left eye looks outward, away from the nose	`eyeLookOutLeft` same shape	✓ made
6	`EyeLookInLeft`Eyes	left eye looks inward, toward the nose	`eyeLookInLeft` same shape	✓ made
7	`EyeLookUpLeft`Eyes	left eye looks up	`eyeLookUpLeft` same shape	✓ made
8	`EyeLookDownLeft`Eyes	left eye looks down	`eyeLookDownLeft` same shape	✓ made
9	`EyeClosedRight`Eyes	right eyelids close	`eyeBlinkRight` same shape	✓ made
10	`EyeClosedLeft`Eyes	left eyelids close	`eyeBlinkLeft` same shape	✓ made
11	`EyeDilationRight`Eyes	right pupil gets larger		not made
12	`EyeDilationLeft`Eyes	left pupil gets larger		not made
13	`EyeConstrictRight`Eyes	right pupil gets smaller		not made
14	`EyeConstrictLeft`Eyes	left pupil gets smaller		not made
15	`EyeSquintRight`Eyes	right eye squints: the lower lid and cheek tighten	`eyeSquintRight` same shape	✓ made
16	`EyeSquintLeft`Eyes	left eye squints: the lower lid and cheek tighten	`eyeSquintLeft` same shape	✓ made
17	`EyeWideRight`Eyes	right upper lid opens wider than normal	`eyeWideRight` same shape	✓ made
18	`EyeWideLeft`Eyes	left upper lid opens wider than normal	`eyeWideLeft` same shape	✓ made
19	`BrowPinchRight`Brows	right brow pulls inward, toward the middle	part of `browDownRight`	✓ made
20	`BrowPinchLeft`Brows	left brow pulls inward, toward the middle	part of `browDownLeft`	✓ made
21	`BrowLowererRight`Brows	right brow moves down	part of `browDownRight`	✓ made
22	`BrowLowererLeft`Brows	left brow moves down	part of `browDownLeft`	✓ made
23	`BrowInnerUpRight`Brows	inner end of the right brow rises	part of `browInnerUp`	✓ made
24	`BrowInnerUpLeft`Brows	inner end of the left brow rises	part of `browInnerUp`	✓ made
25	`BrowOuterUpRight`Brows	outer end of the right brow rises	`browOuterUpRight` same shape	✓ made
26	`BrowOuterUpLeft`Brows	outer end of the left brow rises	`browOuterUpLeft` same shape	✓ made
27	`NasalDilationRight`Nose and cheeks	right nostril flares		not made
28	`NasalDilationLeft`Nose and cheeks	left nostril flares		not made
29	`NasalConstrictRight`Nose and cheeks	right nostril narrows		not made
30	`NasalConstrictLeft`Nose and cheeks	left nostril narrows		not made
31	`CheekSquintRight`Nose and cheeks	right cheek rises toward the eye	`cheekSquintRight` same shape	✓ made
32	`CheekSquintLeft`Nose and cheeks	left cheek rises toward the eye	`cheekSquintLeft` same shape	✓ made
33	`CheekPuffRight`Nose and cheeks	right cheek puffs out with air	part of `cheekPuff`	✓ made
34	`CheekPuffLeft`Nose and cheeks	left cheek puffs out with air	part of `cheekPuff`	✓ made
35	`CheekSuckRight`Nose and cheeks	right cheek sucks in		✓ made
36	`CheekSuckLeft`Nose and cheeks	left cheek sucks in		✓ made
37	`JawOpen`Jaw	jaw opens	`jawOpen` same shape	✓ made
38	`JawRight`Jaw	jaw shifts to the right	`jawRight` same shape	✓ made
39	`JawLeft`Jaw	jaw shifts to the left	`jawLeft` same shape	✓ made
40	`JawForward`Jaw	jaw pushes forward	`jawForward` same shape	✓ made
41	`JawBackward`Jaw	jaw pulls back		✓ made
42	`JawClench`Jaw	jaw clenches, the teeth press together		not made
43	`JawMandibleRaise`Jaw	lower jaw pushes up with the mouth closed		not made
44	`MouthClosed`Mouth and lips	lips stay together while the jaw is open	`mouthClose` same shape	✓ made
45	`LipSuckUpperRight`Mouth and lips	right half of the upper lip rolls inward over the teeth	part of `mouthRollUpper`	✓ made
46	`LipSuckUpperLeft`Mouth and lips	left half of the upper lip rolls inward over the teeth	part of `mouthRollUpper`	✓ made
47	`LipSuckLowerRight`Mouth and lips	right half of the lower lip rolls inward over the teeth	part of `mouthRollLower`	✓ made
48	`LipSuckLowerLeft`Mouth and lips	left half of the lower lip rolls inward over the teeth	part of `mouthRollLower`	✓ made
49	`LipSuckCornerRight`Mouth and lips	right mouth corner tucks inward		not made
50	`LipSuckCornerLeft`Mouth and lips	left mouth corner tucks inward		not made
51	`LipFunnelUpperRight`Mouth and lips	right half of the upper lip flares outward, as in an "O"	part of `mouthFunnel`	✓ made
52	`LipFunnelUpperLeft`Mouth and lips	left half of the upper lip flares outward, as in an "O"	part of `mouthFunnel`	✓ made
53	`LipFunnelLowerRight`Mouth and lips	right half of the lower lip flares outward, as in an "O"	part of `mouthFunnel`	✓ made
54	`LipFunnelLowerLeft`Mouth and lips	left half of the lower lip flares outward, as in an "O"	part of `mouthFunnel`	✓ made
55	`LipPuckerUpperRight`Mouth and lips	right half of the upper lip narrows and pushes forward, as in a kiss	part of `mouthPucker`	✓ made
56	`LipPuckerUpperLeft`Mouth and lips	left half of the upper lip narrows and pushes forward, as in a kiss	part of `mouthPucker`	✓ made
57	`LipPuckerLowerRight`Mouth and lips	right half of the lower lip narrows and pushes forward, as in a kiss	part of `mouthPucker`	✓ made
58	`LipPuckerLowerLeft`Mouth and lips	left half of the lower lip narrows and pushes forward, as in a kiss	part of `mouthPucker`	✓ made
59	`MouthUpperUpRight`Mouth and lips	right half of the upper lip rises and shows the upper teeth	`mouthUpperUpRight` same shape	✓ made
60	`MouthUpperUpLeft`Mouth and lips	left half of the upper lip rises and shows the upper teeth	`mouthUpperUpLeft` same shape	✓ made
61	`MouthUpperDeepenRight`Mouth and lips	the fold from the nose to the right mouth corner deepens as the upper lip rises		not made
62	`MouthUpperDeepenLeft`Mouth and lips	the fold from the nose to the left mouth corner deepens as the upper lip rises		not made
63	`NoseSneerRight`Nose and cheeks	right side of the nose wrinkles upward	`noseSneerRight` same shape	✓ made
64	`NoseSneerLeft`Nose and cheeks	left side of the nose wrinkles upward	`noseSneerLeft` same shape	✓ made
65	`MouthLowerDownRight`Mouth and lips	right half of the lower lip moves down and shows the lower teeth	`mouthLowerDownRight` same shape	✓ made
66	`MouthLowerDownLeft`Mouth and lips	left half of the lower lip moves down and shows the lower teeth	`mouthLowerDownLeft` same shape	✓ made
67	`MouthUpperRight`Mouth and lips	upper lip shifts to the right	part of `mouthRight`	✓ made
68	`MouthUpperLeft`Mouth and lips	upper lip shifts to the left	part of `mouthLeft`	✓ made
69	`MouthLowerRight`Mouth and lips	lower lip shifts to the right	part of `mouthRight`	✓ made
70	`MouthLowerLeft`Mouth and lips	lower lip shifts to the left	part of `mouthLeft`	✓ made
71	`MouthCornerPullRight`Mouth and lips	right mouth corner pulls back and up (the pull of a smile)	part of `mouthSmileRight`	✓ made
72	`MouthCornerPullLeft`Mouth and lips	left mouth corner pulls back and up (the pull of a smile)	part of `mouthSmileLeft`	✓ made
73	`MouthCornerSlantRight`Mouth and lips	right mouth corner tilts upward (the lift of a smile)	part of `mouthSmileRight`	✓ made
74	`MouthCornerSlantLeft`Mouth and lips	left mouth corner tilts upward (the lift of a smile)	part of `mouthSmileLeft`	✓ made
75	`MouthFrownRight`Mouth and lips	right mouth corner pulls down	`mouthFrownRight` same shape	✓ made
76	`MouthFrownLeft`Mouth and lips	left mouth corner pulls down	`mouthFrownLeft` same shape	✓ made
77	`MouthStretchRight`Mouth and lips	right mouth corner stretches sideways and down	`mouthStretchRight` same shape	✓ made
78	`MouthStretchLeft`Mouth and lips	left mouth corner stretches sideways and down	`mouthStretchLeft` same shape	✓ made
79	`MouthDimpleRight`Mouth and lips	right mouth corner pulls straight back and makes a dimple	`mouthDimpleRight` same shape	✓ made
80	`MouthDimpleLeft`Mouth and lips	left mouth corner pulls straight back and makes a dimple	`mouthDimpleLeft` same shape	✓ made
81	`MouthRaiserUpper`Mouth and lips	upper lip is pushed up by the lower lip	`mouthShrugUpper` same shape	✓ made
82	`MouthRaiserLower`Mouth and lips	lower lip pushes up, the chin tightens	`mouthShrugLower` same shape	✓ made
83	`MouthPressRight`Mouth and lips	right half of the lips presses together	`mouthPressRight` same shape	✓ made
84	`MouthPressLeft`Mouth and lips	left half of the lips presses together	`mouthPressLeft` same shape	✓ made
85	`MouthTightenerRight`Mouth and lips	right half of the lips tightens and narrows		not made
86	`MouthTightenerLeft`Mouth and lips	left half of the lips tightens and narrows		not made
87	`TongueOut`Tongue	tongue sticks out	`tongueOut` same shape	✓ made
88	`TongueUp`Tongue	tongue points up		✓ made
89	`TongueDown`Tongue	tongue points down		✓ made
90	`TongueRight`Tongue	tongue points to the right		✓ made
91	`TongueLeft`Tongue	tongue points to the left		✓ made
92	`TongueRoll`Tongue	tongue rolls into a tube		not made
93	`TongueBendDown`Tongue	tongue tip bends down		not made
94	`TongueCurlUp`Tongue	tongue tip curls up		not made
95	`TongueSquish`Tongue	tongue becomes narrow and thick		not made
96	`TongueFlat`Tongue	tongue becomes wide and flat		not made
97	`TongueTwistRight`Tongue	tongue twists to the right		not made
98	`TongueTwistLeft`Tongue	tongue twists to the left		not made
99	`SoftPalateClose`Throat and neck	soft palate closes (at the back of the roof of the mouth)		not made
100	`ThroatSwallow`Throat and neck	throat moves as in swallowing		not made
101	`NeckFlexRight`Throat and neck	neck muscle on the right side tightens		not made
102	`NeckFlexLeft`Throat and neck	neck muscle on the left side tightens		not made

ARKit (Perfect Sync) to VRChat

An avatar with the 52 ARKit shapes already holds most of the motion. 40 ARKit shapes are one tracking key under another name. 12 are blends: one ARKit shape covers 2 or 4 tracking keys. Blended names such as MouthSmileLeft or LipFunnel are not among the 102 keys.

ARKit shape	VRChat tracking key or keys
`eyeBlinkLeft`	`EyeClosedLeft`
`eyeLookDownLeft`	`EyeLookDownLeft`
`eyeLookInLeft`	`EyeLookInLeft`
`eyeLookOutLeft`	`EyeLookOutLeft`
`eyeLookUpLeft`	`EyeLookUpLeft`
`eyeSquintLeft`	`EyeSquintLeft`
`eyeWideLeft`	`EyeWideLeft`
`eyeBlinkRight`	`EyeClosedRight`
`eyeLookDownRight`	`EyeLookDownRight`
`eyeLookInRight`	`EyeLookInRight`
`eyeLookOutRight`	`EyeLookOutRight`
`eyeLookUpRight`	`EyeLookUpRight`
`eyeSquintRight`	`EyeSquintRight`
`eyeWideRight`	`EyeWideRight`
`jawForward`	`JawForward`
`jawLeft`	`JawLeft`
`jawRight`	`JawRight`
`jawOpen`	`JawOpen`
`mouthClose`	`MouthClosed`
`mouthFunnel`	`LipFunnelUpperRight` `LipFunnelUpperLeft` `LipFunnelLowerRight` `LipFunnelLowerLeft`
`mouthPucker`	`LipPuckerUpperRight` `LipPuckerUpperLeft` `LipPuckerLowerRight` `LipPuckerLowerLeft`
`mouthLeft`	`MouthUpperLeft` `MouthLowerLeft`
`mouthRight`	`MouthUpperRight` `MouthLowerRight`
`mouthSmileLeft`	`MouthCornerPullLeft` `MouthCornerSlantLeft`
`mouthSmileRight`	`MouthCornerPullRight` `MouthCornerSlantRight`
`mouthFrownLeft`	`MouthFrownLeft`
`mouthFrownRight`	`MouthFrownRight`
`mouthDimpleLeft`	`MouthDimpleLeft`
`mouthDimpleRight`	`MouthDimpleRight`
`mouthStretchLeft`	`MouthStretchLeft`
`mouthStretchRight`	`MouthStretchRight`
`mouthRollLower`	`LipSuckLowerRight` `LipSuckLowerLeft`
`mouthRollUpper`	`LipSuckUpperRight` `LipSuckUpperLeft`
`mouthShrugLower`	`MouthRaiserLower`
`mouthShrugUpper`	`MouthRaiserUpper`
`mouthPressLeft`	`MouthPressLeft`
`mouthPressRight`	`MouthPressRight`
`mouthLowerDownLeft`	`MouthLowerDownLeft`
`mouthLowerDownRight`	`MouthLowerDownRight`
`mouthUpperUpLeft`	`MouthUpperUpLeft`
`mouthUpperUpRight`	`MouthUpperUpRight`
`browDownLeft`	`BrowPinchLeft` `BrowLowererLeft`
`browDownRight`	`BrowPinchRight` `BrowLowererRight`
`browInnerUp`	`BrowInnerUpRight` `BrowInnerUpLeft`
`browOuterUpLeft`	`BrowOuterUpLeft`
`browOuterUpRight`	`BrowOuterUpRight`
`cheekPuff`	`CheekPuffRight` `CheekPuffLeft`
`cheekSquintLeft`	`CheekSquintLeft`
`cheekSquintRight`	`CheekSquintRight`
`noseSneerLeft`	`NoseSneerLeft`
`noseSneerRight`	`NoseSneerRight`
`tongueOut`	`TongueOut`

The pairs follow the ARKit table of the VRCFaceTracking documentation.

Check your avatar in Blender, free

FaceKeys Check is a free Blender add-on. It reads the shape key names of the face mesh and shows how many of the 102 tracking keys, the 52 ARKit shapes and the 15 visemes the avatar has.

It lists the missing keys by group and names that are almost right, for example a wrong capital letter. It changes nothing in the file.

Get FaceKeys Check (free, Gumroad) BOOTH

Make the missing keys

FaceKeys is our paid Blender add-on for avatars that have no face tracking shape keys. Version 2.1 makes 75 of the 102 keys with VRChat's exact names: the 52 ARKit shapes, split into their tracking keys where one shape covers several, plus CheekSuck, JawBackward and the tongue pointing up, down, left and right.

The other 27 keys are marked "not made" in the table: pupils, nostrils, jaw clench, lip corners, upper lip deepen, lip tightener, the finer tongue shapes, throat and neck.

FaceKeys on Superhive BOOTH

Questions

Does my avatar need all 102 keys?: No. VRChat says that not every tracking key needs a blendshape and that most avatars support only a part of them. Keys without a blendshape simply do nothing.
Do capital letters matter?: Yes. VRChat matches blendshapes by exact name. "jawopen" is not "JawOpen". FaceKeys Check points out names that are almost right.
Is MouthSmileLeft one of the keys?: No. The 102 keys are base shapes. A smile is MouthCornerPull plus MouthCornerSlant on each side. The ARKit shape mouthSmileLeft covers both.
Which side is Left?: The character's own left. On screen, facing the avatar, that is your right.
Are the visemes part of the 102?: No. The 15 visemes (vrc.v_aa and so on) are separate. VRChat can route them through the same Face Tracking section when LipSync Mode is set to Viseme Blend Shape Face Tracking.
What do I need to be tracked?: VRChat names two sources: Selfie Expression, which uses a webcam on a desktop PC or the camera of an Android phone or tablet, and external apps that send data over OSC.
May I use the CSV?: Yes, freely, for anything. The key names are VRChat's. The descriptions are ours and you may reuse them.