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Online EMDR Tool

Free EMDR-style visual bilateral stimulation: moving target with speed and size controls. Visual aid only—not a substitute for therapy.

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How to use

Follow these steps for a clear answer.

1

Set speed and size

Choose how fast the target moves and how large it appears.

2

Start and follow

Press Start and track the moving dot with your eyes only.

3

Stop when done

Stop or Reset anytime. This is a visual aid—not therapy by itself.

Online EMDR tool specification

Version 2.0.0 · Last reviewed 2026-07-28

Definition
Bilateral visual stimulation moves a target left and right so the eyes track horizontally while the head stays still.
What it calculates
Horizontal target position from a sine wave over time, scaled to stage width.
Inputs
  • Speed 1–10
  • Dot size (small / medium / large)
  • Optional soft click
  • Start / Stop / Reset
Outputs
  • Animated target on a dark stage
  • Running / paused status
Formula
x = (sin(2π · t / period) + 1) / 2 · (stageWidth − size); period decreases as speed increases

The Online EMDR Tool shows a moving target for eye-tracking practice. Set speed and size, optionally enable a soft side click, then Start and follow with your eyes only.

Disclaimer: This is a visual aid, not therapy. Use only as directed by a qualified professional. Review the site Terms of Use. If you feel distressed, stop and seek appropriate help.

Assumptions
  • Uses requestAnimationFrame for motion.
  • Visual aid only; not clinical protocol software.
Units
  • Speed: ordinal 1–10; size: pixels
Boundary conditions
  • Narrow stages clamp travel distance.
  • Audio may be blocked until a user gesture.
Example
Speed 5 · Medium → Start → follow the white dot
Validation cases
  • Stop → Animation pauses
  • Reset → Defaults restored
Sources
  • Common bilateral visual tracking practice (non-clinical aid)
Last reviewed
2026-07-28
Calculation version
2.0.0
→ Countdown Timer › → Stopwatch › → Text to speech › → Current Time ›

Frequently asked questions

Key distinctions behind the tool.

Is this a full EMDR therapy session?

No. It only provides a moving visual target. EMDR therapy should be led by a trained clinician.

Can I change the speed?

Yes. Use the Speed slider before or during a run.

What does the soft click sound do?

When enabled, a quiet click plays near each side extremum as an optional bilateral cue.

Is session data recorded?

No. Animation runs locally; nothing is stored or uploaded.

What if I feel distressed?

Stop immediately and contact your therapist or local emergency mental health services.