How to Use a Green Screen in OBS Studio

Learn how to use a green screen in OBS, add a Chroma Key, remove green spill, improve edges and place yourself over images and video backgrounds.

A green screen gives you much cleaner background control in OBS. Here’s how to remove the green, improve the edges and put images or video behind you.

If you've followed the OBS series this far, you've already learned how to add images and overlays and play video directly inside OBS.

Now those layers become much more useful.

Why?

Because once OBS removes your real background, your camera doesn't have to remain a big rectangle.

You become another layer.

That means you can put a background behind yourself, graphics in front of yourself and even animated video behind you.

This is where a green screen really earns its place.

Quick answer: How to Use a Green Screen in OBS Studio explains how to use a green screen in OBS, add a Chroma Key, remove green spill, improve edges and place yourself over images and video backgrounds.

Do You Need a Green Screen for OBS?

No.

I've said this throughout the series because I don't want you thinking you can't use OBS properly without one.

You can use your real office.

You can add a logo.

You can share screens.

You can play videos.

You can record and stream.

All without a green screen.

But if you want clean background replacement and more control over layering, a physical green screen can make a big difference.

The problem with automatic virtual background removal is that it can struggle with the edges.

Move your fingers and bits disappear.

Move your head and your hair starts flickering.

A chair suddenly becomes part of your body and then disappears again.

You've probably seen it.

A properly set up green screen gives the software a much easier job because you're deliberately giving it one colour to remove.

What Does Chroma Key Mean in OBS?

A Chroma Key removes a selected colour from your video.

For a normal green screen setup, that colour is green.

OBS looks for the green background and makes those areas transparent.

Once the green has gone, anything underneath your camera source in the OBS stack can show through.

So instead of this:

You + green wall

you can have:

You + virtual office

or:

You + animated background

or:

You + presentation graphics

That's the basic idea.

Start With a Smooth Green Screen

In the workshop, I'm using a pull-up green screen.

It sits on the floor and extends upwards.

One reason I like that type is that the material stays relatively smooth.

You can also buy curtain-style green screens, of course, but lots of folds and creases can make getting a clean key more difficult.

Think about what OBS is trying to do.

It wants to identify one consistent colour.

If half the green screen is brightly lit, another area is dark and a big crease creates a shadow, you're giving OBS several different shades to deal with.

You can still work with it.

It just makes the job harder.

Light the Green Screen as Evenly as You Can

You don't need to turn your room into a Hollywood studio.

But you do want reasonably even light across the green background.

That's important.

During the workshop, one side of my green screen is darker than I'd like.

That makes the key less clean.

I adjust the light coming into the room and the result immediately improves.

That's a useful lesson.

Before spending 20 minutes moving Chroma Key sliders, look at the actual green screen.

Is one side much darker?

Is there a heavy shadow?

Can you move the screen?

Can you improve the lighting?

Sometimes the best OBS setting isn't inside OBS at all.

Keep Some Distance Between You and the Green Screen

Where possible, avoid sitting hard against the green screen.

Giving yourself and the screen some separation can make the setup easier to control.

It also helps reduce problems caused by shadows.

Again, the workshop example shows that changing the physical setup can improve the result before you start applying more filters.

Don't assume every problem needs another software effect.

Sometimes moving something a little is the better fix.

How to Crop Your Camera in OBS

Before applying the Chroma Key, you may not need the entire camera frame.

Perhaps the edge of your green screen only covers part of what your camera can see.

OBS lets you crop the camera source.

Select your camera.

Hold the Alt key and drag the edge of the source.

Instead of simply resizing the image, you're cropping part of it away.

You can crop unnecessary areas from the left or right until the frame mainly contains the section you actually need.

There is one obvious limitation.

If you later move your arm into an area you've cropped out, OBS can't show it.

You've cut it off.

So don't crop so tightly that you can't move naturally.

Give yourself some room.

Add Your New Background First

Before removing the green, add the image you want behind yourself.

Go to:

Sources → + → Image

Then choose your background from your organised OBS project folder.

If you've been following the series, this should already make sense from How to Add Images and Overlays in OBS.

Resize the background so it fills the canvas.

Then move the background below your camera in the Sources list.

At first you probably won't see it.

That's because your camera is still showing the green screen.

Turn the camera off temporarily and you'll see the background underneath.

Turn it back on and the green returns.

Now we're ready to remove it.

How to Add a Chroma Key in OBS

Select your camera source.

Open:

Filters

Under the effect filters, click:

+ → Chroma Key

Add the filter.

OBS may immediately remove a large part of the green.

Don't expect the default result to be perfect.

The aim now is to adjust the key until the background disappears without removing parts of you.

Start With Green as the Key Colour

For a normal green screen, use green as the key colour type.

If you were using a blue screen, you could key blue instead.

Simple.

The more interesting part is deciding exactly how aggressively OBS should remove that colour.

This is where the similarity, smoothness and spill controls start to matter.

What Does Similarity Do in OBS Chroma Key?

Similarity controls how much of the colour range OBS treats as part of the key.

Increase it and OBS removes a broader range around your selected green.

That can help remove remaining patches of background.

Push it too far and OBS can begin removing things you want to keep.

Parts of your face.

Clothing.

Objects.

Edges.

So move it gradually.

Watch yourself as you adjust it.

The goal isn't:

Remove absolutely everything possible.

The goal is:

Remove the background while keeping you looking natural.

There is a difference.

Use a Custom Green Colour if It Gives You a Better Key

The workshop also demonstrates choosing a custom colour.

Instead of relying only on the default green, you can use the colour picker and sample the actual green from your screen.

I normally wouldn't sample the brightest or darkest part.

Pick a representative mid-green area.

Then adjust the Chroma Key from there.

That gives OBS a closer match to the colour you're actually using.

This can be particularly useful when the physical green doesn't exactly match what the default key expects.

What Does Smoothness Do?

Smoothness affects the transition around the keyed edge.

Increasing it can soften the boundary between you and the removed background.

But again, more isn't always better.

Push it too far and the effect can start eating into your edges.

Hair and fine details may become less clean.

In the workshop setup, I keep this very low because that works better for the particular scene.

Your setup may differ.

That's why I keep saying:

Look at the picture.

Don't copy a slider number simply because somebody else used it.

Lighting, camera, clothing and screen colour all affect the result.

What Is Green Spill?

Green spill is the green tint that can remain around your edges even after the main background has been removed.

You might notice it around:

shoulders
hair
hands
clothing edges

OBS includes a spill reduction control.

Increasing it can help neutralise some of that remaining green.

But if you push it too far, it can start affecting your own colour too.

You don't want to solve a green edge by making yourself look grey.

Use enough to clean the edge.

Then stop.

Test the Key With Your Hands and Head

Don't judge your Chroma Key while sitting perfectly still.

Move.

Wave your hands.

Spread your fingers.

Move your head from side to side.

Those are the areas where a bad background removal normally reveals itself.

In the workshop, I deliberately move my hands and head so you can see how much cleaner the physical green screen can look once it's keyed properly.

That's the test.

Not whether one frozen frame looks good.

You're going to be teaching, presenting and gesturing.

Make sure the key survives normal movement.

You Can Add More Than One Key Filter

OBS lets you stack filters.

In the workshop, I demonstrate adding another colour-related key to deal with an area that still isn't quite right.

You can use another Chroma Key or a Color Key depending on what you're trying to clean up.

But be careful here.

Adding another filter isn't automatically an improvement.

Every extra filter is another adjustment that can affect your image.

Use it when you've got a specific remaining problem.

Don't pile five filters onto the camera and assume you're being more professional.

A better physical green screen setup may solve the problem more cleanly.

Fix the Room Before Overcorrecting in OBS

This happened during the workshop.

One part of the green screen is darker.

I could keep adding filters and aggressively keying it out.

Or I can improve the light.

I change the lighting.

The darker patch improves.

Suddenly I need less filtering.

That's a useful principle for all video work.

Fix what you can before the signal reaches OBS.

Then use OBS to fine-tune it.

Don't ask software to rescue something that could have been sorted with a simple physical adjustment.

Why Green Screen Changes OBS Stack Order

Before the green screen, your camera includes your entire background.

You can put a logo over your camera, but you can't put that logo behind your head because your camera is one complete rectangle.

Once the green has been removed, that's different.

Your camera becomes transparent around you.

Now the source stack really starts working like layers.

Imagine your Sources list contains:

Logo

Camera

Background

If the logo is above the camera, it can appear in front of you.

Move the logo below the camera and your keyed body can appear in front of the logo.

That's much more flexible.

You're no longer stuck with every graphic sitting on top of a rectangular webcam picture.

Put Yourself Over a Static Background

You've already added the background beneath your camera.

Once the green has been keyed out, that background becomes visible around you.

Now resize and position yourself.

You might sit centrally.

You might put yourself slightly to one side so presentation graphics have room on the other side.

You have control over the layout.

And because everything is inside OBS, the finished composition can be sent into Zoom using the setup from How to Set Up OBS Studio for Online Teaching & Zoom.

Use an Animated Video as Your OBS Background

Remember the looping video we added in How to Add Video to OBS Studio and Control Playback?

Now it makes more sense.

Add the looping video as a Media Source.

Move it below your keyed camera.

Resize it.

Now the video becomes your moving background.

Your source stack might look something like:

Foreground logo

Camera with Chroma Key

Animated background video

That's a completely different presentation from a basic webcam.

And you haven't had to rebuild the entire setup in a video editor.

It's happening live inside OBS.

Add Other Graphics Around Yourself

Once your background is transparent, you can start combining everything you've learned.

You can add:

a logo
a microphone graphic
text elements
background images
looping media
foreground designs

Then use stacking order to decide what is in front and what is behind.

You can also turn sources on and off using the eye icons.

So one camera scene can contain several possible visual setups.

This is where OBS starts feeling less like a webcam utility and more like a little production environment.

You Can Remove Green From Video Graphics Too

Here's another useful trick from the workshop.

A Chroma Key doesn't only work on your camera.

Imagine you've created an animated logo video, but the animation has been rendered over a green background.

Add that animation to OBS as a Media Source.

Then select the media source itself and add:

Filters → Chroma Key

Remove the green.

Now the animated logo can sit over your camera or other background without the green rectangle around it.

That's a clever way to create moving overlay graphics.

You don't personally need to be standing in front of a green screen for this trick.

The media is what's being keyed.

Chroma Key Works on Sources, Not Just People

This is worth understanding.

When you apply a Chroma Key filter in OBS, you're applying it to a source.

That source could be:

your camera
a video
an animated graphic

You're telling OBS:

Remove this colour from this source.

Once you understand it that way, you can start thinking creatively about where the technique might be useful.

Green Screen Versus Automatic Background Removal

Automatic background removal is convenient.

No argument there.

You don't have to put anything behind you.

But convenience doesn't always mean the cleanest result.

The workshop repeatedly shows the problem with automatic cut-outs: the popping and strange edges around moving areas.

If you're running an occasional meeting, that may not bother you.

If you're regularly recording courses, presenting workshops or creating branded content, you may want something cleaner.

That's where a physical green screen can be worth the extra setup.

Think again before assuming software removal is always the simpler option.

If you spend every session fighting bad edges, the green screen may actually save you time.

What Makes a Good OBS Green Screen Setup?

Based on the workshop process, concentrate on the practical basics:

use a reasonably smooth green background
keep the lighting as even as you can
avoid a heavily shadowed corner
crop unnecessary areas from the camera frame
sample a useful green when needed
adjust similarity carefully
use spill reduction only as much as needed
test with normal movement
fix physical lighting problems before piling on filters

You don't need perfection.

You need a key that stays clean enough while you actually present.

Common OBS Green Screen Problems

Parts of the green screen are still visible

Check whether the lighting is uneven. Then adjust your Chroma Key similarity carefully or sample a more representative custom green.

OBS is removing parts of me

Your key may be too aggressive. Reduce the similarity or other settings and check whether your clothing contains colours close to the background.

I have green around my shoulders or hair

Use the spill reduction control carefully. Also check whether the screen is reflecting green light onto you.

One side keys properly but the other doesn't

Look at the physical screen. Uneven light or shadows can create different shades of green across it.

My hand disappears when I move

Test your key settings and make sure the automatic or chroma-key removal isn't cutting too aggressively into your edges.

My background is covering me

Check your source stack order. The background needs to sit below your keyed camera.

My logo always appears in front of me

Move the logo below the keyed camera if you want yourself to appear in front of it.

My cropped camera cuts off my arm

You've cropped too tightly. Hold Alt and open the crop back up enough to allow normal movement.

OBS Green Screen Checklist

Before moving into screen sharing, make sure you can:

put up and reasonably light your green screen
crop unnecessary areas from your camera
add an image background
move the background below the camera source
add a Chroma Key filter to your camera
choose green or sample a custom colour
adjust the key without removing parts of yourself
control green spill around the edges
test the result while moving your hands and head
understand how stack order changes once you're keyed out
place a static image behind yourself
place looping video behind yourself
chroma-key a green-screen animation or logo if you want to experiment

Don't worry if your first attempt needs some tweaking.

Green screening is one of those things where moving the light or screen by a small amount can make a surprisingly big difference.

Learn OBS With Me in the Free Workshop

Green screen is much easier to understand when you can actually watch the green disappear while the key settings are adjusted.

That's exactly what we work through in the free Learn OBS Workshop.

You'll see how the background, camera, overlays, video and stack order come together inside a real OBS scene.

Learn OBS Workshop | Present, Stream & Record Better

You can also return to the complete Learn OBS beginner's guide at any point to see how this tutorial fits into the full series.

FAQ About Using a Green Screen in OBS

How do I remove a green screen in OBS?

Select your camera source, open Filters, add a Chroma Key and choose green as the key colour. Adjust the settings until the green is removed without cutting into your face, clothing or hands.

What is the best Chroma Key setting in OBS?

There isn't one setting that works for every room. Your screen colour, lighting and camera all affect the result. Start with the green key and adjust the similarity, smoothness and spill controls while watching the actual image.

Why isn't my OBS green screen removing evenly?

Uneven lighting is a common cause. If one area of the screen is darker or heavily shadowed, OBS may not treat it as the same colour as the rest of the green background.

How do I put an image behind me in OBS?

Add the image as a source, resize it to fill the canvas and move it below your camera in the Sources list. Once your camera's green background has been removed, the image will show through behind you.

Can I use a video as a green screen background in OBS?

Yes. Add a video as a Media Source, set it to loop if appropriate and place it beneath your keyed camera source. The video will then play behind you.

What is green spill in OBS?

Green spill is the green tint that may remain around the edges of your subject after keying. The Chroma Key settings include spill reduction to help neutralise it, but too much can affect your own colours.

Can I crop my camera in OBS before using Chroma Key?

Yes. Hold the Alt key while dragging the edges of the camera source to crop unwanted areas. Leave enough room for normal hand and body movement.

Can OBS Chroma Key remove green from a video?

Yes. Chroma Key can be applied to a Media Source as well as a camera. The workshop demonstrates using this to remove the green background from an animated logo video.

Is a green screen better than an automatic virtual background?

A physical green screen can give you a cleaner and more predictable edge, particularly around hands, hair and movement. Automatic removal is more convenient, but the result depends heavily on the software and computer doing the processing.

Do I need an expensive green screen?

The workshop doesn't require an expensive studio installation. The priority is having a usable green surface that stays reasonably smooth and evenly lit.

What To Do Next

You can now put yourself over a completely different background.

More importantly, you're no longer trapped inside a rectangular camera box.

That becomes really useful in the next part.

Continue with How to Screen Share and Use Masks in OBS.

We'll look at sharing an entire monitor, capturing a specific window, adding your microphone to the screen-sharing scene and putting your camera into the corner — either with a circular mask or as a clean green-screen cut-out.

That's where all the pieces we've built so far start working together.

Join the free Learn OBS Workshop and follow the full setup with me.

FAQ

Who is How to Use a Green Screen in OBS Studio for?

How to Use a Green Screen in OBS Studio is for course creators, coaches and educators who want a clearer OBS setup for recording lessons, streaming sessions or creating better video content for their online business.

How does this OBS workflow connect with New Zenler?

Creators can use OBS to improve video and live-session production, then use New Zenler to host courses, deliver memberships, run live sessions, build funnels and manage learners in one platform.

What should creators check before recording or streaming with OBS?

Check the scene layout, microphone input, audio filters, camera framing, recording settings, internet connection and where the finished lesson or live replay will be delivered in New Zenler.

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