NUMBERPLATER3D gel vs 4D number plates: what's the difference?
Both are raised-character plates, both are road-legal when made to BS AU 145e — and they look distinctly different. 3D gel characters are domed, glossy gel resin; 4D characters are laser-cut from thicker solid acrylic with crisp, flat tops. This guide shows both finishes on real plates we've made, explains how each is manufactured, and settles the legality question — so the only decision left is which look you prefer.
How each is made
A 3D gel plate uses characters formed from black gel resin, cured into a smooth dome and applied to the reflective plate face. The dome gives each finished character a rounded, glossy profile that catches the light.
A 4D plate takes a different route: each character is laser-cut from solid acrylic and fixed to the reflective plate face. The characters are thicker, with flat tops and sharp, vertical edges — no dome, no gloss curve, just a bold block of black standing off the plate.
“3D” and “4D” are trade names, not legal categories. In the eyes of the rules, both are simply number plates with raised characters.
The look, up close
The clearest difference is in the character profile. Gel is soft and reflective — the dome gives every stroke a highlight. Acrylic is sharp and matte-edged — the flat top and square sides make the character read bolder from a distance and more sculpted up close.
- 3D gel: domed, glossy, softer — depth you notice in the light.
- 4D: flat-topped, sharper, bolder — depth you notice from across the street.
Legality: a dead heat
Neither finish is “more legal” than the other. GOV.UK's display rules state plates can have 3D (raised) characters — which covers both — and every plate fitted since 1 September 2021 must meet BS AU 145e. What decides legality is the same for both: characters in a single shade of black, the mandatory font and sizes, a plain reflective background (white front, yellow rear), and the BS AU 145e + supplier markings on the plate. Break any of those and the plate is illegal whatever its finish — with a fine of up to £1,000 and an MOT failure as the consequence. The full breakdown is in are 4D plates legal? and are 3D gel plates legal?
Durability and price
Both finishes are made to BS AU 145e, which sets durability and visibility requirements, and both of ours carry the same 12-month manufacturing warranty. We won't claim one outlasts the other, because we don't have the evidence to — the honest position is that both are built to the same standard and backed the same way.
On price, 4D sits above 3D gel as our premium line. Our current prices:
- 3D Gel: £34.99 for a front & rear pair, £20.99 for a single plate.
- 4D Gel: £49.99 for a front & rear pair, £30.99 for a single plate.
Which suits what
- Choose 3D gel if you want depth with a subtler, glossier character — it upgrades the plate without shouting, and suits cars where you want the finish noticed second, not first.
- Choose 4D if you want the boldest look you can legally run — the sharp, flat-topped characters suit modern and modified cars where the plate is part of the styling.
- Either way, the legal bits are identical — same font, same sizes, same markings, same document check before we make it. You're choosing a look, not a legal risk.
Quick answers
Is 3D or 4D more legal?
Neither — it's a false question. GOV.UK's rules allow raised characters, so both 3D gel and 4D plates are equally road-legal when they meet BS AU 145e, and equally illegal when they don't. Legality comes from the colour, font, sizes, background and markings, not the character depth.
What's the visual difference between 3D gel and 4D?
3D gel characters are domed and glossy — a smooth, rounded profile formed from gel resin. 4D characters are laser-cut from thicker solid acrylic with flat tops and sharp edges, giving a bolder, more architectural look. Side by side, 4D reads as crisper; 3D reads as softer and glossier.
Do 3D or 4D plates last longer?
Both are made to BS AU 145e, which sets durability requirements, and both of ours carry the same 12-month manufacturing warranty. We don't claim one finish outlasts the other.
Which is more expensive?
4D is our premium line and sits above 3D gel on price. Current prices for both are shown live on this page and in the builder.
Need a plate that's actually legal?
Build yours in our configurator — legal font, sizes and spacing are applied automatically, and every order is entitlement-verified before you're charged. If a combination isn't road-legal, it won't let you build it.
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Reviewed 2026-07-02 · Written by Numberplater Ltd, a DVLA-registered number plate supplier (RNPS No. 75456). This guide is general information, not legal advice — the rules summarised here are set out in full in DVLA guidance (leaflet INF104 and GOV.UK).