CSS Neon Glow Generator

Create glowing neon text or box effects. Adjust color, intensity, and layers, then copy the CSS.

Target Mode: Text GlowGlow Color: #00FFFFIntensity Factor: 2xLayers Count: 3

Presets:

Glow Parameters

Glow Color

Glow Target

Intensity: 2x

Shadow Layers: 3

Preview Text

Realtime Preview

NEON

Generated CSS

.neon-glow {
  color: #00ffff;
  background: transparent;
  text-shadow: 0 0 4px rgba(0,255,255,1),
    0 0 8px rgba(0,255,255,0.9),
    0 0 16px rgba(0,255,255,0.7);
}

CSS neon glow generator

Neon glow effects in CSS are created with layered text-shadow (for text) or box-shadow (for elements). Multiple layers at increasing spread radii build the characteristic bright-core-with-halo look. Adjust Intensity (multiplies each spread) and Layers (number of shadow layers) to dial in from subtle to blazing. The generated class is .neon-glow — just paste it into your stylesheet and apply the class.

Built and maintained by Meet Shah · Last updated 19 July 2026

What this tool is used for

Producing a glowing text or box effect for a dark-themed design.
Getting the layered shadow values a neon effect needs.
Tuning glow spread against a live preview.
Producing an effect for a game or an entertainment interface.
Comparing a text-shadow glow against a box-shadow one.

Frequently Asked Questions

How is a neon glow built?: By stacking several `text-shadow` layers at increasing blur radii and decreasing opacity — a tight bright core, then progressively wider, fainter halos. A single large shadow reads as a smear; the layering is what produces the falloff a real gas tube has.
Why do the layers have to go from tight to wide?: Because shadows paint in order and the eye reads the innermost as the light source. Listing a wide faint halo first and a tight core last still works visually, but the tight core must remain the most opaque or the whole thing looks like a blur rather than a glow.
What makes a neon effect look convincing?: A dark background and a saturated hue. Real neon is emitted light, so it has nothing to read against on white — the glow simply washes out. Colours near the sRGB gamut edge (cyan, magenta, lime) look most like gas discharge because those are the hues real tubes produce.
Is a text-shadow stack expensive?: Moderately — each layer is a separate blur, and blurs are among the more costly paint operations. Six layers on a heading is fine; six layers on a paragraph of body text, animated, is where a low-end device starts dropping frames.
Can the same technique glow a box rather than text?: Yes — `box-shadow` takes the same stacked layers, and adding a matching `inset` shadow simulates the tube's interior brightness. The one difference is that `box-shadow` follows the border radius, so a glowing rounded rectangle needs no extra work.

Common errors and gotchas

Relying on the glow for contrast, which usually fails an accessibility ratio.
Stacking many shadow layers, which is expensive to paint on large elements.
Using it on body text, where the glow reduces legibility rather than adding to it.
Assuming it reads on a light background, when the effect needs darkness to work.
Animating the glow without respecting reduced-motion preferences.