3D Gel vs 4D Number Plates: What Is the Difference?

3D gel characters are a gel resin domed over printed characters. 4D characters are cut from sheet acrylic with a laser and bonded onto the plate. Everything underneath is the same: both sit on a reflective plate built to the British Standard, BS AU 145e, with the same Charles Wright characters at the same size and spacing. What changes is how the characters are made, how far they stand off the plate, and how they catch the light.

In short: gel is the softer, glossier look and the cheapest of the raised styles; 4D is sharper and stands out further; and 4D with gel puts a dome on top of a laser-cut character for people who want both. All three are road legal when the finished plate meets the standard.

Everything the law cares about is identical on both. The plate is the same reflective white at the front and yellow at the rear, the characters are the same mandatory font at the same height and spacing, and the same supplier name, postcode and BS AU number are printed along the bottom. Nothing about choosing gel or 4D changes what a camera or an MOT tester sees.

3D gel plates

3D gel number plates are typically the cheapest raised style available. The characters are printed onto the plate, then a polyurethane gel resin is formed over each one in the Charles Wright font and cured hard. The result is a domed character with a curved top that catches the light along its whole surface.

The finish is subtler than 4D. From straight on, a gel plate reads as a normal plate with depth and gloss; from an angle the dome picks up highlights. It is the style most people choose when they want the plate to look finished rather than to announce itself.

4D laser cut plates

A 4D character is cut from black acrylic with a laser, then bonded to the plate. The cut leaves a flat top and square edges, so the character has a hard outline and a shadow that moves as you walk past. It is the boldest of the raised styles and the reason people notice a 4D plate from across a car park. Our 4D laser cut plates are made this way in County Durham.

Depth is the choice within 4D. A 3mm character is the everyday option and sits close enough to the plate to look tidy on any car. A 5mm character stands proud of the plate and throws a deeper shadow, which suits a larger vehicle or a plate meant to be seen. Both use the same material and the same fixing method; the only difference is how far they come off the plate.

The characters are bonded to the plate rather than screwed or clipped on, so there is no gap behind them for water to sit in and nothing to work loose over time. That matters more than it sounds: a raised character that is poorly bonded is the one thing that will let a 4D plate down, and it is the reason the bonding is done under controlled conditions rather than in the car park.

The name is an industry one rather than a DVLA term. These characters are three-dimensional, not four-dimensional: 4D was coined to distinguish laser-cut acrylic from 3D gel, and it stuck. Our 4D number plates page compares the whole range, including the Outline, Hover, Shadow and Retro styles that are built the same way.

4D with gel

This style combines the two: a laser-cut acrylic character with a gel dome formed over the top. You get the sharp outline and depth of 4D with the glossy curve of gel, which is the usual answer for anyone who likes both and cannot choose between them.

How durable are they

Both are made from acrylic, which is reasonably resilient but not unbreakable: the plate itself can crack if it is dropped or bent. Gel characters are flexible and take knocks well, though they can be scratched or gouged. Laser-cut 4D characters are more brittle, so do not bend them, and do not drill through the characters on either style. Damage caused by mishandling is not covered for replacement.

Day to day, both wash the same way as the rest of the car, by hand, with the usual care around the edges of raised characters. Our guide to cleaning 3D and 4D plates covers what to avoid, including holding a pressure washer close to the characters.

Are both road legal?

3D gel and 4D plates are legal when the finished plate meets the British Standard, BS AU 145e, and every plate we make is built to it. That covers the plate material, the reflectivity, the character font, size and spacing, and the supplier details printed along the bottom. A raised character is not what makes a plate legal or illegal; the plate meeting the standard is.

A proposed amendment to that standard has been under consideration for some time, and it would affect raised characters if it were adopted. Our guide to 3D and 4D number plate legality sets out where that has actually got to, with sources, rather than the version that circulates on social media.

Which should you choose?

Choose 3D gel if you want the look without the shout, or if price is the deciding factor. Choose 4D if you want the plate to be the first thing anyone notices, and 5mm over 3mm if the car is big enough to carry it. Choose 4D with gel if you have been going back and forth between the two, because it is genuinely both rather than a compromise between them.

Whichever you pick, the fitting is identical, and our fitting guide covers taking the old pair off and putting the new pair on.

Common questions

Do 4D plates cost more than 3D gel? Yes, in general. Gel is the cheapest of the raised styles and the laser-cut styles sit above it, with 5mm above 3mm.

Will a raised plate fail an MOT? Not if the finished plate meets BS AU 145e and is displayed correctly. Plates fail for the things that always failed them: wrong spacing, wrong font, damage, dirt, or a plate that has faded or cracked.

Can I have 3D gel or 4D on a motorbike? Yes. A motorbike plate is a different size and only goes on the rear, but the character styles are the same.

Can a car wash pull the characters off? Not a working plate in normal use. The risk with any raised character is a pressure washer held close and square to the edge of a character, which is worth avoiding on gel and 4D alike.

Can I have one style on the front and another on the back? You can, and some people do put 5mm on the rear and 3mm on the front where the front plate sits closer to a bumper. Both plates still have to meet the standard in their own right.

Which one lasts longer? In normal use, both outlast the car they are on. The difference shows in how they fail: gel scratches and gouges, laser-cut acrylic chips if it is struck hard enough.