Measure from the inside of the A-pillars and allow about two inches of clearance on each side. That number is your banner width. Height depends on where the banner sits and your state's eyeline requirements, but 4 to 6 inches is the standard range for a visor-area strip.
Order smaller than you measured. You can trim a banner that's slightly too wide. You cannot add vinyl back.
Where Windshield Banners Go
Most car scene banners run across the top of the windshield in what's called the sun visor area — the strip between the top of the glass and the shade the factory shade band covers. That's where JDM builds, drift cars, and car club installs live.
Some builds run a full-width strip lower on the glass, either across the middle or just above the dash. These are less common and more visibility-dependent — they look aggressive but the legal line on driver sightlines is tighter.
A third placement is the rear window, usually centered or full-width across the top. Fewer restrictions on the back glass, and it reads to traffic behind you instead of alongside you.
How to Measure Your Windshield
You need three measurements:
- Width: Inside edge of the left A-pillar to the inside edge of the right A-pillar, measured at the position where you want the banner to sit. The glass narrows slightly at the top corners — measure where the banner will actually be, not at the widest point.
- Height: How tall the banner needs to be. Standard is 4 to 6 inches. Going taller than 6 inches in the visor area starts to eat into sightlines depending on the car's rake.
- Arc or flat: Most windshields are curved. A flat banner applied to curved glass will lift at the edges. Banners cut to the arc of your specific windshield hug the glass edge to edge and don't lift.
For a vehicle-specific banner, bring the year, make, and model to your order. At Beaver Slaps, custom windshield banners are cut to the dimensions you provide — the more specific, the cleaner the fitment.
Legal Sizing
Most states regulate how much of the windshield can be covered and at what height. The common requirement is that nothing can obstruct the driver's line of sight — the area directly in front of the driver between the top of the steering wheel and the top of the windshield frame.
In practice, a 4-to-6-inch visor-area banner on most cars clears this without issue. A banner that drops below the shade band or wraps far into the driver's direct sightline is where you'll get flagged.
Check your state's vehicle code if you're building for shows that do safety inspections. For street builds and car meets, visor height is the safe zone on virtually every car.
Standard Sizes vs Custom Cut
Some shops sell banners in fixed widths — 48 inches, 50 inches, 60 inches — and you trim them yourself. That works for generic builds but doesn't account for the windshield arc or exact A-pillar placement.
A custom die cut banner is sized to your car. It arrives ready to apply with no trimming, no guessing, no excess vinyl bunching at the edges. For a build where the details matter, that's the only approach that holds up.
Applying a Windshield Banner
Clean the glass with isopropyl alcohol before application. Any contamination — water spots, wax residue, bug film — creates a bond failure point at the edge and the banner will start lifting there first.
Use the wet method for long banners: mist the glass with soapy water, position the banner before it locks, then squeegee from center out toward each edge. This gives you time to realign before the adhesive sets. Dry application on a 50-inch banner with no repositioning window is a straight line to a crooked install.
Shop These Slaps
- Custom Windshield Banner — Cut to your specs, die cut to the arc of your glass. Provide your width, height, and design and we cut it ready to install.
- Car Club Decals — If your build is part of a club or crew, coordinate your glass with the rest of the group. Priced for runs.
