Short answer
- 20% tint lets about 20% of visible light through the glass. It looks dark from outside and gives strong daytime privacy.
- It is not a standard legal shade for the front side windows in Illinois. Illinois allows 35% or 50% VLT beside the driver, depending on your rear glass.
- 20% is a popular choice for rear windows, because it closely matches factory privacy glass on most SUVs and trucks.
- Darkness does not equal heat rejection. A light ceramic film can beat a dark dyed film on heat every time.
- If you drive a lot on unlit roads, 35% is the safer starting point.
If you want your car windows noticeably darker without going all the way to a limo-style 5% tint, 20% window tint is one of the most popular shades to consider.
A 20% tint gives your car a dark, clean look and good privacy during the day. It is also dark enough to affect visibility at night, and there are Illinois window tint rules to work through before you choose it.
If you are looking at 20% car window tinting in Highland Park or elsewhere on Chicago's North Shore, here is what to know first.
What Does 20% Window Tint Mean?
The percentage on window tint refers to Visible Light Transmission, usually shortened to VLT.
A 20% window tint allows about 20% of visible light through the window. It blocks most of the visible light coming through the glass and gives the window a fairly dark appearance.
The lower the percentage, the darker the tint.
| Tint level | Appearance | Privacy | Night visibility |
|---|---|---|---|
| 50% | Light | Low | Excellent |
| 35% | Medium | Moderate | Very good |
| 20% | Dark | High | Moderate |
| 15% | Very dark | Very high | Reduced |
| 5% | Limo dark | Maximum | Poor |
For most people, 20% sits between a normal medium tint and the much darker limo tint look. If you want the opposite end of the scale, read our guide to 70% window tint.
What Does 20% Tint Look Like?
From outside the car, 20% tint looks noticeably dark.
In normal daylight it is hard to see clearly into the vehicle from a distance. If the sun is shining directly through the glass, you may still see silhouettes, seats, or parts of the interior.
From inside the vehicle the difference is much smaller during the day. You can still see out clearly, but bright sunlight and glare are reduced. At night the difference becomes more noticeable.
Daytime: how each shade reads from outside
After dark: how much comes through from inside
Illustration only. Screen brightness, your glass, and your interior color all change the real result. Swipe to compare on mobile.
Your car also affects how dark 20% tint looks. A vehicle with a black interior can look much darker than the same film on a car with beige or white seats. Window size and angle matter too.
How Much Privacy Does 20% Window Tint Give You?
Privacy is one of the main reasons drivers choose 20% tint.
During the day, someone standing outside usually cannot see clearly into the vehicle unless they are close to the glass or strong sunlight is passing through the cabin. It makes items inside less visible and gives the car a more private feel.
20% tint is not total privacy. At night, with your interior lights on, people can still see in. Strong sunlight can also make the interior more visible during the day.
If maximum privacy is the goal, 5% or 15% is darker. Those shades also cut visibility much more. For many drivers 20% is the balance point between privacy and everyday usability, especially on rear windows.
Can You See Through 20% Tint at Night?
Yes, but this is the biggest thing to weigh before choosing 20%.
In areas with streetlights, headlights, and storefronts, most drivers are comfortable with 20% tint. On very dark roads, visibility through 20% is noticeably lower than through 35% or 50% glass.
You will notice it most when:
- Turning onto a poorly lit street
- Checking for pedestrians or cyclists
- Looking through your side windows
- Backing into a dark driveway
- Parking at night
- Driving in rain after dark
This matters on the North Shore because your driving mixes brightly lit stretches with quiet residential roads around Highland Park, Lake Forest, Deerfield, and Winnetka. If you regularly drive at night on darker roads, 35% is the better choice.
20% vs. 35% Window Tint
This is the most common decision drivers face. Drag the handle to see the same vehicle in both shades.
![[Vehicle] side profile with 35% window tint on the side windows](data:image/svg+xml;base64,PHN2ZyB2aWV3Qm94PSIwIDAgMTY3MiA5NDEiIHdpZHRoPSIxNjcyIiBoZWlnaHQ9Ijk0MSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48L3N2Zz4=)
35% tint 20% tint 20% tint
- More privacy. Much harder to see inside.
- Darker look. A stronger blacked-out finish.
- More glare reduction. Less visible light enters the cabin.
- Reduced night visibility. You notice the film when looking out after dark.
35% tint
- Lighter, subtler look. Clearly tinted without being extreme.
- Better night visibility. Easier to spot pedestrians and curbs.
- Less privacy. People can see in more easily in daylight.
- Standard legal option for front side windows on most Illinois cars.
If you value appearance and privacy, 20% is usually more appealing. If you value nighttime visibility and a factory-style look, 35% is usually better. For a full side-by-side breakdown, read our dedicated guide to 35% vs 20% window tint.
Does 20% Tint Block More Heat Than 35%?
Not necessarily. This is the biggest misconception about window tint.
Tint darkness and heat rejection are not the same thing. A cheap, very dark film can perform worse against heat than a much lighter premium ceramic film.
Ceramic window tint is built to reduce infrared energy without relying on darkness. That means you can pick the shade for the look and visibility you want, then pick the film technology for heat rejection.
At Unlimited Auto Style we install XPEL ceramic window tint, including XPEL PRIME XR and XR Plus. XPEL lists XR Black 20 at roughly [20% VLT and up to 99% UV rejection: confirm against current XPEL spec sheet].
If your main goal is a cooler car, do not assume you need the darkest film available. Compare carbon and ceramic film, or read the difference between XPEL XR and XR Plus.
Does 20% Tint Block UV Rays?
With a high-quality ceramic film, yes. Premium ceramic window films can block up to [99]% of harmful UV rays.
UV protection helps reduce long-term sun exposure inside the vehicle and protects materials such as:
- Leather seats
- Dashboards
- Door panels
- Trim
- Upholstery
This matters most for vehicles parked outside all day. Remember that UV protection comes from the film technology, not from how dark it looks.
Is 20% Window Tint Legal in Illinois?
This is where choosing a shade gets more complicated.
20% tint is not a standard legal option for the front side windows in Illinois.
Illinois regulates the windows immediately beside the driver partly based on how much light passes through the rear windows. Under the Illinois Vehicle Code (625 ILCS 5/12-503), qualifying configurations allow nonreflective tint of at least 35% VLT or at least 50% VLT on the windows beside the driver. Vehicles with manufacturer-installed smoked or tinted rear glass fall under separate rules.
Because 20% transmits less light than either limit, it should not be treated as a legal front-side-window option in Illinois without a qualifying exemption.
Illinois also prohibits tint across the full front windshield. A nonreflective strip up to six inches from the top of the windshield is permitted.
Your exact legal setup depends on the vehicle, the factory glass, the rear window tint, and where the film is installed. It is better to have your glass checked before choosing percentages than to assume one number works on every window. Our full breakdown is here: Illinois window tint law.
This is general information, not legal advice. Confirm current requirements with the Illinois Secretary of State before booking any shade.
Can I Put 20% Tint on the Rear Windows?
Rear windows give you more flexibility, but they still affect the legal configuration for the rest of the vehicle.
This matters most on SUVs, trucks, and crossovers that already have factory privacy glass on the rear doors and cargo area.
Factory privacy glass and aftermarket window film are not the same thing. Factory privacy glass is darkened during manufacturing. It provides privacy, but it does not necessarily provide the same heat rejection as ceramic window film.
Adding ceramic film over factory privacy glass improves heat and UV protection, and it also changes the final amount of visible light passing through the window. That is why an installer should look at your actual glass instead of choosing a setup from a number alone.
Is 20% Ceramic Tint Worth It?
If 20% suits the windows you want tinted, ceramic film is usually worth the upgrade. Compared with basic dyed tint, quality ceramic film gives you:
- Better heat rejection. It cuts more of the solar energy that heats the cabin.
- UV protection. Premium films block up to [99]% of UV rays.
- Reduced glare. Useful in bright mornings, evening sun, and highway driving.
- No metallic signal interference. Non-metallic ceramic films do not interfere with GPS, cellular, or radio signals.
- Long-term appearance. Quality films resist fading, bubbling, and discoloration.
The key point: 20% describes how dark the tint is. Ceramic describes the technology inside the film. They are two separate decisions.
Will 20% Tint Look the Same on Every Car?
No, and this surprises a lot of customers. The finished result depends on:
- The vehicle's factory glass
- Interior color
- Window size and angle
- Windshield size
- Existing factory privacy glass
- Amount of sunlight
- Type of tint film
For example, 20% on a sedan with a black interior can look considerably darker than 20% on a car with a light interior and a large panoramic glass roof.
The film also combines with the glass already in your car, so the final measured VLT may not match the number printed on the film. That is why looking at real vehicles, or using a window tint simulator, beats comparing film samples alone. We tint Teslas, BMWs, Porsches, and Rivians every week, so we can show you the shade on a car like yours.
Is 20% Tint Too Dark?
For some drivers, yes. For others it is exactly the look they want. Pick the statement that sounds most like you.
I mainly want privacy and a blacked-out look
20% is a strong fit for your rear windows. It closely matches factory privacy glass on most SUVs and trucks, so the car reads as one consistent shade. Plan on 35% or 50% for the front side windows to stay within Illinois limits.
I drive at night, often on unlit roads
Start at 35%. You keep a clearly tinted look with far better visibility when you are checking for pedestrians, curbs, and cyclists in low light. If you still want heat control, put the budget into ceramic film rather than into a darker shade.
I care most about heat, not darkness
Choose the film technology first. A ceramic film at 35% or even 50% can reject more infrared energy than a cheap dyed 20% film. Shade and heat rejection are separate specifications, so do not buy darkness expecting cooling.
I want the darkest legal setup possible
In Illinois that usually means the lightest legal shade in front, paired with a much darker shade behind the driver. The exact combination depends on your rear glass, so bring the car in and we will measure it before quoting.
I have never had tinted windows before
35% is the safer first step. It is the standard legal shade for front side windows on most Illinois passenger cars, and it gives you a clear sense of how film changes the car before you go darker on a future vehicle.
If you are torn between the two, 35% is the safer starting point for visibility and 20% gives you noticeably more privacy.
Frequently Asked Questions About 20% Window Tint
Is 20% tint very dark?
20% is considered a dark window tint. It is considerably darker than 35% or 50%, but it is not as dark as 5% limo tint.
Can people see inside a car with 20% tint?
In normal daylight it is difficult to see clearly inside from a distance. Up close, in direct sunlight, or with interior lights on, the cabin can still be visible.
Is 20% tint darker than 35%?
Yes. A 20% tint allows about 20% of visible light through the window, while 35% allows about 35%. Lower VLT numbers mean darker glass.
Is 20% tint good for night driving?
It depends on the driver and the lighting. Visibility is noticeably reduced compared with 35% tint, especially on dark roads or when parking at night.
Does 20% tint keep a car cooler?
It can, but tint percentage alone does not determine heat rejection. A premium ceramic 35% film can reject more heat than a cheap 20% dyed film.
Is 20% tint legal on front windows in Illinois?
20% does not meet the standard VLT requirements for the windows immediately beside the driver in Illinois. Your legal configuration depends on the vehicle and on the tint or factory glass on the rear windows. Confirm with the Illinois Secretary of State.
Is 20% tint good for an SUV?
20% works well on rear SUV windows, but many SUVs already have factory privacy glass. Adding film changes the final VLT, so the existing glass should be measured before choosing a shade.
See What 20% Tint Looks Like on Your Car
Choosing between 20%, 35%, and 50% is much easier when you can compare shades before installation. At Unlimited Auto Style in Highland Park, IL, we install XPEL ceramic window tint on cars, SUVs, trucks, Teslas, BMWs, Porsches, and Rivians. We are a Certified XPEL Installer with 10+ years on Chicago's North Shore, serving Highland Park, Highwood, Deerfield, Lake Forest, Winnetka, and the wider North Shore.
Tell us what you drive and the look you want. We will measure your glass, confirm a legal configuration, and show you the options.
Keep reading
Vehicle brand names are used for identification only. Unlimited Auto Style is an independent installer and is not affiliated with, authorized by, or endorsed by any vehicle manufacturer. Tint law information is general guidance and not legal advice.
