How To Use seedRandom Expression in After Effects

Description

**This tutorial will show you how to use the seedRandom Expression with the wiggle expression in Adobe After Effects CC 2025.

wiggle(3,50);
Frequency (3): It wiggles 3 times per second.
Amplitude (50): It moves up to 50 pixels away from its original spot.

• seedRandom(seed,true):
  ‘Seed’ is just an identifier: The seed (whether a number like 1 or index or a slider value) is like a label that tells After Effects, “Hey, use this random pattern.” It doesn’t change the size or speed—just picks which wiggle you get.
• “index is the layer’s number—1, 2, 3—so each layer gets a unique seed.
• ‘true’ keeps it consistent: Spot on. Setting seedRandom(seed, true) makes the randomness “timeless”—the wiggle pattern stays the same throughout the animation and every time you play it.
• ‘false’ makes it unpredictable: If you use seedRandom(seed, false), the randomness becomes “time-based”—the wiggle pattern changes every frame, making it unpredictable.

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Chapters:
00:00 Intro: About The Tutorial
00:30 Add Wiggle Expression to Position
00:50 Wiggle Expression Values
01:17 Copy + Paste Wiggle
01:44 Seed Number
02:14 Seed Random Expression
02:33 seedRandom + True/False
03:23 Control Wiggle (Seed Number)
04:31 Seed Random + Index
04:54 Index Column in Layers Panel
05:29 Duplicating Layers w/Seed Numbers
05:57 Change Seed Number to Index
06:30 Advantage of Using Index
06:57 Change Index to Seed Number

**Software Used:
**Adobe After Effects CC 2025 (Click To Try or Buy)

How To Use seedRandom Expression (Seed Number**)**

1. Add Logo, Text or Footage Layer
2. Select Footage Layer
3. Tap ‘P’ for Position Property
4. Enter seedRandom(1, true);
   wiggle(3,50)
5. Duplicate footage layer (as many times as you want)
6. Tap Spacebar to Preview
7. Animations will wiggle the same because Seed Number is the same.
8. Change the seed number (first number in seedRandom) to add variety of wiggle

How To Use seedRandom Expression (Index)

1. Add Logo, Text or Footage Layer
2. Select Footage Layer
3. Tap ‘P’ for Position Property
4. Enter seedRandom(index,true);
   wiggle(3,50)
5. Duplicate footage layer (as many times as you want)
6. Tap Spacebar to Preview
7. Animations will wiggle differently because Seed Number Index assigns random seed to each layer