To replay a moment that just happened in Streamlabs Desktop, enable Replay Buffer to capture recent footage, then add the separate Instant Replay source to the scene where you want the clip to appear. Assign a hotkey to save the replay, start the buffer, and test it before you go live.
Replay Buffer is the background capture; Instant Replay is the scene item that plays a saved segment. The distinction matters: enabling one does not automatically mean the other is visible to your audience. The steps below cover both, plus the choices that affect memory use and whether the clip is for live playback or later editing.
Replay Buffer and Instant Replay do different jobs
Replay Buffer continuously keeps the recent interval you choose in Output settings. It is not the same as a normal recording that saves an entire session from beginning to end. When you press the save-replay hotkey, Streamlabs uses the buffer to capture the recent segment. The length you configured determines how far back that segment reaches.
Instant Replay is a source you add to a scene. After a replay is saved, that source displays the clip, so viewers can see it while you are streaming. If your goal is only to keep a highlight for editing later, you may not need to show the Instant Replay source in your live scene. Streamlabs’ recording guide describes a separate Replay/Highlighter workflow for reviewing, trimming, arranging and exporting clips.
Think of these as two stages: capture and presentation. Replay Buffer supplies the recent footage; the hotkey saves it; Instant Replay presents it in the scene. A scene without the source can still have a working buffer, but pressing the hotkey will not add a visible replay item to that scene. Conversely, adding the source does not start background capture by itself.
This setup is useful for a live game, a music performance with a notable moment, a local event or a presenter who wants to repeat a short demonstration. It is less useful if your channel simply runs a prepared video loop and there is no moment you need to capture as it happens. For a channel built around continuous playback, compare that workflow with a 24/7 YouTube playlist setup before adding controls you will not use.
Enable Replay Buffer in Output settings
Open Streamlabs Desktop settings and select Output. Find the Replay Buffer control and enable it. The precise arrangement of settings can change between software versions, so if the labels differ, check Streamlabs’ current Instant Replay setup instructions.
Enabling the feature is not necessarily the same as starting it. You can start the buffer manually with Start Replay Buffer in the Streamlabs Desktop window. There is also an option in General settings to automatically start the replay buffer when streaming. Turn that on if you want it to begin with each stream; leave it off if you prefer to make a deliberate manual start.
Automatic start reduces the chance of going live and forgetting to activate capture. Manual start can make sense if you only need replays for a particular portion of a broadcast, or if you want to control when the buffer is active. Neither setting changes the buffer duration. You still need to choose an interval in Output settings, and the replay hotkey cannot save footage from before the buffer started.
A useful pre-stream habit is to check the buffer status in the Streamlabs window before relying on the hotkey. If the automatic setting is enabled, verify that the buffer has actually started after you begin streaming. If you are not live, start it manually when you want to test or capture a moment. Streamlabs’ recording guide also describes using Replay Buffer manually outside a live broadcast.
Choose a buffer length for the moment you need
Set the replay duration in the Replay Buffer section of Output settings. The setting is the amount of recent footage the buffer should retain, not a promise about how long the replay will remain on screen. When you save a replay, the selected interval is what you are asking Streamlabs to capture.
Streamlabs’ setup material uses 20 seconds and 30 seconds as examples. These are illustrations, not required settings or recommendations for every computer. A shorter interval uses less memory and may be enough for a brief reaction or a single action. A longer interval preserves more lead-in, which can help if you need the context before a moment, but longer buffers require more memory. Streamlabs does not provide a universal memory figure in the cited setup instructions, so avoid treating any duration as a guaranteed fit for every system.
| Choice | What it gives you | Trade-off to consider |
|---|---|---|
| Shorter buffer | A compact replay focused on the immediate moment | It may miss the lead-in if the key event takes time to develop |
| Longer buffer | More context before the moment | It uses more memory, and the amount depends on your system and capture settings |
| Automatic start | The buffer begins with streaming when the setting is enabled | You still need to confirm it started and test the save action |
| Manual start | You decide when capture begins | You can miss a moment if you forget to start it |
Choose based on what you want viewers to see. If you need to repeat a short point in a tutorial, a modest interval may capture enough context. If you are following a longer sequence in a live event, you may want more lead-in. Test the result rather than assuming that a particular duration is inherently right.
If your machine becomes less responsive after enabling a longer buffer, shorten the interval and test again. Do not infer from a successful test on one scene that every resolution, frame rate or workload will behave identically. The buffer is one part of the work your computer is doing, and the trade-off is worth checking on the actual setup you plan to use. For other capture-related choices, the video formats and decoding guide explains why media formats and processing can matter when preparing video.
Assign a hotkey to save a replay
Open Settings > Hotkeys and find the replay action for saving a replay. Assign a key combination that you can reach reliably without triggering it accidentally. Streamlabs’ hotkey guide recommends using a combination of at least two keys to reduce unintended activation; consult its hotkey setup guide if the controls have moved in your version.
Choose a combination that does not conflict with a game, presentation app or other software you use during the stream. If a key already performs an important action elsewhere, pressing it to save a replay could cause confusion or disrupt what viewers see. Practise the combination before going live, and keep a note of it near your controls until it becomes familiar.
You can also assign hotkeys to show or hide the Instant Replay source, or switch to a dedicated replay scene. Those are separate controls from saving the clip. Saving captures the interval; showing the source or changing scenes determines how it is presented. You do not need every possible hotkey, but it helps to decide in advance whether the clip should appear over your current scene or in a separate layout.
A Stream Deck is optional. If you have one, you can set a button to send the same keyboard shortcut assigned in Streamlabs Desktop. The hotkey remains the underlying action, so there is no need to buy a button controller to use Instant Replay. A keyboard shortcut is enough for the basic workflow.
Add Instant Replay to the scene
In the scene where you want the saved clip to appear, add a source and choose Instant Replay. Follow the prompts in Streamlabs Desktop to add it. If you plan to show replays in more than one scene, add and configure the source where it is needed rather than assuming that it will be present everywhere.
Place and resize the source as you would other scene items. Consider whether it should cover the full scene, sit in a smaller window, or appear in a dedicated replay layout. Check its position against your other sources: a replay that sits behind an opaque video or image will not be visible, even when the clip has been saved correctly.
Decide how viewers should encounter the replay. You can keep the source in the current scene and use its visibility controls, or use a separate scene designed for replay playback. The first is straightforward when you want a clip to appear over the live presentation; the second gives you more control over the layout, but requires a scene change. Assign show, hide or scene-switch hotkeys only if they fit your workflow, then test the sequence in the order you will use it live.
Keep the purpose of the clip in mind. If you are saving highlights for later, showing the source to viewers may be unnecessary. If the audience needs to see the replay immediately, check that the source is in the active scene and that its placement leaves important information visible. A lower-third, chat panel or event scoreboard can be obscured if the replay takes up too much of the canvas.
Save and test a replay before going live
Before a broadcast, start the Replay Buffer using Start Replay Buffer, unless you have confirmed that automatic start is enabled and working. Create a visible action or say a short phrase, wait briefly, and press the save-replay hotkey. The resulting segment should play in the Instant Replay source. Check both the playback and the audio if audio is part of what you are capturing.
The test verifies several separate pieces: the buffer is running, the hotkey reaches the save action, the clip is captured, and the source is visible in the scene. If the save action does nothing, first check that the buffer has started and that the shortcut is assigned. If a replay is saved but viewers cannot see it, check that Instant Replay is in the active scene, visible, and not hidden behind another source.
If the replay is shorter than expected, review the duration in Output settings and make another test. Remember that the buffer cannot include footage from before it began running. If it misses the lead-in, increase the interval and test again, while keeping the memory trade-off in mind. Do not wait until an important live moment to discover that the buffer was off or the hotkey conflicts with another action.
For a later editing workflow, use Streamlabs’ Replay/Highlighter tools to review and prepare a clip rather than treating the scene source as an archive. A source playing a saved replay and a clip retained for editing serve different purposes. Keep the original recording or another copy if you need material beyond the replay segment, and verify where Streamlabs saves or exports it in your version before relying on it.
This guide is about capturing and presenting a replay within Streamlabs Desktop. It is not a way to make a channel run unattended. If your wider problem is keeping a prepared broadcast online while your computer is off, the considerations in cloud streaming versus running a PC in India are more relevant than replay controls.
When you have confirmed the scene, hotkey and buffer behaviour, use the setup that fits whether you need live playback or an editing clip.
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FAQ
How do I set up Instant Replay in Streamlabs Desktop?
Enable Replay Buffer in Settings > Output, choose a duration, assign a save-replay hotkey in Settings > Hotkeys, and start the buffer. Add Instant Replay as a source to the scene where you want the clip to play. Test the whole sequence before going live.
How do I save the last 30 seconds?
Set the Replay Buffer duration to 30 seconds, start the buffer, then press the hotkey assigned to save a replay. Thirty seconds is an example duration in Streamlabs’ guidance, not a requirement; a longer buffer uses more memory, so test the setting on your system.
How do I replay a clip while streaming?
Add the Instant Replay source to the active scene, start Replay Buffer, and press the save-replay hotkey after the moment you want to capture. The saved segment should play through that source. If viewers do not see it, check the source’s visibility, position and scene.
Does Instant Replay save a clip for editing later?
The Instant Replay source is for playing the saved segment in a scene. For reviewing, trimming and exporting clips, Streamlabs documents a separate Replay/Highlighter workflow. Use that workflow when your aim is a later edit rather than immediate playback for viewers.