What Is OBS? A Complete Guide to Open Broadcaster Software

OBS, short for Open Broadcaster Software, is a free, open-source application used for live streaming and video recording. OBS Studio is Available on Windows, macOS, and Linux, OBS Studio lets you capture video from your screen, webcam, or game, mix audio from multiple sources, and broadcast everything to platforms like Twitch, YouTube, and Facebook Live. Since its release in 2012, OBS has grown into one of the most widely used streaming tools in the world, trusted by gamers, educators, businesses, and content creators of all kinds.

In this guide, you’ll learn what OBS stands for, how the software works under the hood, what features it offers, who uses it, and how to get started. We’ll also cover system requirements, recommended settings, how OBS compares to alternatives like Streamlabs and XSplit, and how to pair OBS with a multistreaming platform like Castr to broadcast to multiple destinations at once.

What Does OBS Stand For?

OBS stands for Open Broadcaster Software. The terms “OBS,” “OBS Studio,” and “Open Broadcaster Software” all refer to the same application.

The project was created by Hugh “Jim” Bailey (who also goes by Lain Bailey, the name used on the official OBS Project Patreon page). The original version, later called OBS Classic, was first announced in late August 2012 and was a simpler tool built for Windows only. In 2013, development began on a rewritten version called OBS Multiplatform, which was later renamed OBS Studio. This new version added support for macOS and Linux, introduced a more powerful plugin API, and brought a much broader feature set.

OBS Classic was officially discontinued on October 14, 2016, and OBS Studio became the sole active version. The OBS Project is funded through community donations on Open Collective and Patreon, along with sponsorships from companies in the streaming industry, and the software is distributed under the GPLv2 open-source license.

How Does OBS Work?

At its core, OBS works like a virtual TV production studio running on your computer. It follows a simple input-to-output pipeline:

Capture inputs. OBS grabs video and audio from sources you choose: your screen, a specific application window, a webcam, a game, a microphone, or even a browser window.

Arrange into scenes. You organize those inputs into “scenes,” which are preset layouts. Each scene can contain multiple “sources” layered on top of each other.

Mix audio. The built-in audio mixer lets you control volume levels, mute individual sources, and apply filters like noise suppression or gain adjustment.

Encode in real time. OBS compresses the combined video and audio output using an encoder (software-based like x264, or hardware-based like NVIDIA NVENC).

Send to a destination. The encoded stream is either sent to a live streaming platform using a protocol like RTMP or SRT (via a server URL and stream key), or saved as a local recording on your hard drive.

This entire process happens in real time. You press “Start Streaming” or “Start Recording,” and OBS handles the rest. If you’re streaming, you’ll paste a stream key and server URL from your chosen platform (or from a service like Castr) into OBS’s settings, and the software pushes your broadcast to that destination.

Key Features of OBS Studio

OBS Studio has earned its reputation as the industry standard because of a deep feature set that rivals paid alternatives. Here’s a breakdown of the most important capabilities.

Scenes and Sources

Scenes are the building blocks of any OBS setup. Each scene is a layout or preset that contains one or more “sources,” which are the individual media elements visible on screen.

Common source types include:

• Display Capture — records your entire monitor
• Window Capture — records a specific application window
• Game Capture — hooks directly into a game for optimized performance
• Video Capture Device — connects your webcam or capture card
• Browser Source — displays a web page (useful for overlays, alerts, and widgets)
• Image / Image Slideshow — adds static graphics or rotating images
• Text (GDI+/FreeType 2) — adds on-screen text
• Media Source — plays a video or audio file

You can create as many scenes as you need and switch between them during a stream using mouse clicks, hotkeys, or custom transitions. Most streamers set up at least a “Starting Soon” scene, a main streaming scene, and a “Be Right Back” scene.

Audio Mixer and Filters

OBS includes a per-source audio mixer that shows real-time volume levels for every active audio input. You can adjust volume using faders, mute individual sources with a single click, and route audio to different tracks for recording.

Built-in audio filters include:

• Noise Gate — cuts out background noise below a set threshold
• Noise Suppression — reduces constant background sounds like fans or air conditioning
• Gain — boosts or lowers the volume of a source
• Compressor — evens out volume spikes so loud moments don’t clip
• VST 2.x Plugin Support — lets you load third-party audio processing plugins for professional-grade sound control

These filters are applied per source, so you can treat your microphone differently from your desktop audio or game sound.

Studio Mode

Studio Mode splits the OBS preview window into two panels: an Edit view on the left and a Live (Program) view on the right. This lets you prepare and adjust your next scene without your audience seeing the changes. When you’re ready, you click “Transition” to push the edited scene live.

Studio Mode is a standard feature in professional broadcast workflows. It’s especially useful for live events, church services, and multi-camera productions where you need to preview content before it goes on air.

Virtual Camera

OBS can output your scene as a virtual webcam, which means any application that accepts a camera input (Zoom, Google Meet, Discord, Microsoft Teams) can use your OBS output as its video feed.

This feature became widely popular during the rise of remote work and virtual meetings. Instead of showing a plain webcam feed in a video call, you can use OBS to add branded overlays, screen shares, lower thirds, or picture-in-picture layouts, and then send that polished output into your meeting app.

To use it, click “Start Virtual Camera” in the OBS controls panel, then select “OBS Virtual Camera” as your video input in the other application.

Plugins and Extensibility

Because OBS is open source, it has one of the largest plugin ecosystems of any streaming tool. The software supports native C/C++ plugins as well as scripts written in Lua or Python.

Popular plugins include:

• NDI Plugin — enables network-based video transport using the NDI protocol
• StreamFX — adds advanced filters, sources, and transitions
• Advanced Scene Switcher — automates scene changes based on conditions you define
• Move Transition — creates smooth animated movements of sources between scenes
• Source Dock — lets you dock any source as a panel in the OBS interface

Plugins should only be downloaded from trusted sources like the OBS Forums plugin repository or the developer’s official GitHub page. Third-party plugins from unknown sites can introduce stability issues or security risks.

Who Uses OBS? Common Use Cases

OBS is not just for gamers. While gaming and Twitch streaming drove its early adoption, the software is now used across a wide range of industries and use cases:

• Gamers and Twitch streamers use OBS to broadcast gameplay, add webcam overlays, and interact with chat in real time.
• Content creators and YouTubers rely on OBS for recording tutorials, product reviews, and screen-based content with professional layouts.
• Educators and trainers use OBS to deliver virtual lessons, record lecture content, and share presentations with students.
• Businesses and enterprises stream corporate events, product launches, town halls, and webinars using OBS as their production tool.
• Churches and religious organizations broadcast live worship services, sermons, and community events to remote congregations.
• Podcasters and webinar hosts manage multiple audio and video sources in a single session, switching between speakers and screen shares.
• Event organizers produce live coverage of conferences, concerts, and sporting events with multi-camera setups.

Many of these users pair OBS with a multistreaming service to send their broadcast to several platforms at the same time. By default, OBS sends one outbound stream to a single destination, so a cloud-based distribution platform like Castr handles the job of pushing that single stream to YouTube, Facebook, Twitch, and other channels at once. (Recent OBS versions do support multiple RTMP outputs through advanced settings or plugins, but cloud multistreaming remains far more efficient on bandwidth and CPU.)

Is OBS Free? Pricing and Licensing Explained

Yes, OBS Studio is 100% free. There are no hidden costs, no premium tiers, no subscription fees, and no watermarks on your recordings or streams. Every feature in OBS is available to every user at no charge.

The software is licensed under the GNU General Public License v2 (GPLv2), which means the source code is publicly available on GitHub and anyone can use, modify, or distribute it.

While OBS itself is free, many users choose to pair it with paid services for additional capabilities like multistreaming, cloud recording, or CDN-powered delivery. These are separate tools that work alongside OBS, not costs associated with OBS itself.

OBS System Requirements

OBS Studio runs on most modern computers, but performance depends heavily on what you’re doing with it. A simple screen recording needs far less power than a 1080p 60fps game stream with multiple overlays.

Supported Operating Systems (per the official OBS Project)

• Windows 10 or 11 (64-bit)
• macOS 11 (“Big Sur”) or newer (the current installer requires macOS 12.0+)
• Modern 64-bit Linux distributions with X window system or Wayland

Hardware Requirements

A Note on Encoders

Hardware encoding (NVIDIA NVENC, Intel Quick Sync, AMD VCE/AMF) offloads the video compression work from your CPU to your GPU’s dedicated encoding chip. This significantly reduces CPU load and is the recommended approach for most users, especially those who are gaming and streaming at the same time.

The Auto-Configuration Wizard in OBS tests your CPU, GPU, and internet upload speed on first launch and recommends the best encoder, bitrate, resolution, and frame rate based on your hardware.

How to Download and Set Up OBS Studio

Getting started with OBS takes just a few minutes:

1. Go to the official website. Visit obsproject.com and download the installer for your operating system. OBS is also available on Steam for Windows and macOS.
2. Install the application. Run the installer and follow the on-screen prompts. No special configuration is needed during installation.
3. Launch OBS and run the Auto-Configuration Wizard. On first launch, OBS will ask if you want to run the wizard. Select “Yes.”
4. Choose your primary use. The wizard will ask whether you want to optimize for streaming or recording. Pick the option that matches your goal.
5. Let the wizard test your system and apply its recommended settings.
6. Create a scene and add sources. Click the “+” button under Scenes to create a new scene, then click “+” under Sources to add your webcam, screen capture, or other inputs.

Important: Always download OBS from the official obsproject.com website or from Steam. Third-party download sites may bundle the installer with unwanted software or malware.

OBS vs. Streamlabs vs. XSplit: How Does OBS Compare?

OBS Studio is widely regarded as the standard for free streaming software, but it’s not the only option. Here’s how it stacks up against two other widely used tools.

OBS Studio is the best choice for users who want maximum control, flexibility, and performance without paying anything. Its open-source nature means it has the largest community of developers building plugins and extensions.

Streamlabs Desktop is built on top of OBS’s codebase and adds a beginner-friendly interface with pre-built overlays, alert widgets, and a theme store. It’s a good fit for new streamers who want to get up and running quickly, though it uses more system resources than standard OBS.

XSplit Broadcaster offers a polished, app-like experience with a clean interface and strong feature set, but it requires a paid subscription for full access and only runs on Windows.

If you want to broadcast to YouTube, Twitch, and Facebook at the same time from OBS, the simplest path is to connect OBS to a multistreaming service like Castr.

How to Use OBS With Castr for Multistreaming

Castr is a live video streaming platform that accepts your OBS stream and distributes it to 30+ platforms at once. Your computer only sends one stream (to Castr), and Castr’s multi-CDN infrastructure handles delivery to every destination you’ve configured. This approach saves bandwidth, reduces CPU load, and gives you a single dashboard to monitor all your destinations.

Here’s how to set it up:

1. Create a Castr account. Sign up at castr.com — a free trial is available with no credit card required.
2. Create a new live stream project. From the Castr dashboard, click to create a new stream and select the ingest location closest to you.
3. Copy the RTMP URL and Stream Key. Castr will generate a unique RTMP URL and stream key for your project. You’ll find these on the stream dashboard.
4. Open OBS and go to Settings → Stream. In the “Service” dropdown, select Custom. Paste Castr’s RTMP URL into the “Server” field and the stream key into the “Stream Key” field. Click “Apply.”
5. Add publish destinations in Castr. Back in the Castr dashboard, click “Add Publish Destination” and connect your YouTube, Twitch, Facebook, or other platform accounts. You can add as many as your subscription allows.
6. Toggle your destinations on. Make sure each platform you want to stream to is enabled in the Castr dashboard.
7. Click “Start Streaming” in OBS. OBS sends your stream to Castr, and Castr pushes it to all your connected platforms simultaneously.

That’s it. Your computer handles one outbound stream, and Castr does the heavy lifting of distributing it everywhere else.

Castr works with any encoder that supports custom RTMP, not just OBS. But since OBS is free and widely supported, it’s the encoder Castr recommends most often.

Start Streaming With OBS and Castr

OBS Studio is a powerful, flexible, open-source tool for live streaming and video recording — and it costs nothing. Whether you’re streaming gameplay on Twitch, recording tutorials for YouTube, or broadcasting a live event for your business, OBS gives you the production tools to create professional-quality content.

If you want to go beyond streaming to a single platform and reach audiences across multiple destinations from one broadcast, Castr makes it simple. Connect OBS to Castr, add your platforms, and go live everywhere at once.

Try Castr free today and start multistreaming with OBS.