3D vs 4D Number Plates

3D vs 4D Number Plates: What’s the Difference?

3D and 4D number plates are both raised-character alternatives to standard flat printed plates — but they’re made differently, look different up close, and suit different budgets. Here’s how they compare.

3D Gel Number Plates

3D number plates are created by applying a gel resin over a printed acrylic base, then curing it into raised, glossy characters. This gives them:

✔ A smooth, rounded, high-gloss finish
✔ Slightly more flexibility — less prone to cracking on impact
✔ A lower price point than 4D plates
✔ Full compliance with BS AU 145e when correctly manufactured

4D Acrylic Number Plates

4D number plates are laser-cut from solid acrylic and bonded directly onto the plate, rather than moulded from gel. This produces:

✔ Sharp, precise 90° edges and deeper visual dimension
✔ A more premium, “engraved” appearance
✔ Around a 30% price premium over 3D gel plates
✔ Full compliance with BS AU 145e when correctly manufactured

Because the characters are solid acrylic rather than gel, 4D plates can be more prone to chipping on hard impact than 3D gel plates, though both are considerably more durable than flat printed plates.

Are Both Styles Road Legal?

Yes. Neither style is inherently illegal — what matters is whether the finished plate meets BS AU 145e: solid black characters in the correct Charles Wright font, correct sizing and spacing, and a compliant reflective background with supplier details. Read our full guide to 4D plate legality for the detailed requirements.

Which Should You Choose?

If you want a noticeably deeper, more dramatic finish and don’t mind paying more, 4D is the better choice. If you prefer a smoother gloss look at a lower price with slightly more resilience to knocks, 3D gel is a great option. Both are made to the same legal standard at PlateBoss, so the decision comes down to look and budget rather than legality.