Projector Keystone & Geometry Alignment Grid

Free fullscreen alignment grid for projector setup. Adjustable spacing (10–200 px), variable line thickness, optional edge markers and corner L-shapes for precise alignment with screen borders. Use this with physical projector tilt, lens shift, and geometry correction — but avoid digital keystone where possible since it shrinks the usable resolution.

How to align keystone

1
Position the projector first

Move the projector physically until the image is roughly square on the screen. Lens shift handles small offsets best — keystone is a last resort.

2
Open the grid fullscreen

With edge markers ON, the corner L-marks should sit exactly on the screen corners. If they overshoot or undershoot, the projector is too far or too close.

3
Use lens shift, then keystone

Vertical or horizontal lens shift moves the image without distorting it — use this first. Only use digital keystone if you cannot fix it physically.

4
Verify with dense grid

Drop spacing to ~20 px and verify lines stay parallel to the screen border across the full image.

Customisable fullscreen grid for trapezoid and geometry calibration

White on black
Use this for keystone, lens shift and geometry alignment — NOT for sharpness (use the Focus Test for that). Adjust the projector position physically, then use lens shift; only resort to digital keystone if absolutely necessary, since it reduces effective resolution.

Features

Adjustable spacing Edge markers Custom colour Live preview
Who is this tool for?
📽️ Projector Owners

FAQ

Why avoid digital keystone correction?

Digital keystone resamples the image — a 1080p projector with -5° vertical keystone may only display ~1700×950 effective pixels. The unused projector pixels are wasted, you lose sharpness, and text becomes fuzzy. Always prefer physical positioning or lens shift.

What is lens shift and why is it better?

Lens shift physically moves the lens horizontally or vertically inside the projector body, offsetting the image without changing its shape or size. No pixels are wasted, no resolution is lost. Only mid-range and high-end projectors offer it.

How do I align the projector to a fixed screen?

Turn on edge markers, project the grid, and physically nudge the projector until the corner L-marks sit exactly on the screen corners. Then fine-tune with lens shift. Verify centre with the cross at the middle.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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