What Is B-Roll? A-Roll vs B-Roll, Explained With Examples

B-roll is any footage that cuts away from your main shot. If A-roll is you talking to camera, b-roll is everything else the viewer sees while you keep talking — graphics, animated text, charts, cutaways, product shots. It illustrates the point, hides your edits, and keeps the frame moving so attention doesn't drift.

The definition, precisely

B-roll is supplementary footage intercut with the main footage. The test is simple: if you closed your eyes and the video still made sense, what you were hearing is the A-roll. Everything you were seeing that wasn't the speaker is b-roll.

Note that "b-roll" describes a role in the edit, not a type of file. The same clip can be A-roll in one video and b-roll in another. A screen recording is A-roll in a software tutorial and b-roll in a video about productivity.

A-roll vs B-roll

Why it's called "b-roll"

It's a survival from physical film. Editors kept the primary take on one reel — the A reel — and duplicates or supplementary shots on a second reel, the B reel, so they could cut between them without cutting into the original negative. The reels disappeared decades ago. The word didn't.

The three jobs b-roll actually does

1. It shows the thing. You say "revenue tripled in two quarters." A chart appearing at that moment does more than the sentence can on its own.
2. It hides your cuts. Removing an "um" from a talking-head shot leaves a visible jump. Cut away for those two seconds and the jump disappears. This is why b-roll is often called the editor's safety net.
3. It resets attention. A static frame decays. Changing what's on screen buys back another stretch of attention — which is why retention graphs tend to dip during long uninterrupted talking-head sections.

Kinds of b-roll (footage is only one)

• Motion graphics. Animated text, numbers, charts, diagrams. The most useful kind for explainer, finance, tech and educational content, because it can be about the exact thing you said.
• Stock footage. Licensed clips. Fast to get, but generic — there's no stock clip for "our API latency dropped 40%."
• Self-shot cutaways. Your hands, your desk, your product. High trust, slow to produce.
• Screen recordings. The actual thing you're describing. Underrated and free.
• AI-generated video. Flexible, expensive per second, and still unreliable for text, numbers and precise concepts.

For knowledge content the ranking is usually: motion graphics > screen recording > self-shot > stock > AI video. Most creators reach for stock first because it's the most obvious, and it's the one that matches their words least.

B-roll shot types

"Kinds" is about where the footage comes from. Shot types are about what the camera is doing — the vocabulary editors actually use when they mark up a script. Each one answers a different question the viewer is silently asking.

• Establishing shot. Wide, at the top of a scene. Answers where are we. The exterior of the building before the interview starts.
• Cutaway. Anything that leaves the main subject for a moment. The workhorse — most b-roll is a cutaway.
• Insert. A tight shot of a specific detail inside the scene: the screen being tapped, the number on the invoice. Answers which thing exactly.
• Over-the-shoulder. Frames what someone is looking at from behind them. Puts the viewer in the subject's position.
• POV. What the subject sees. Stronger than over-the-shoulder, harder to shoot well.
• Detail / macro. Texture and craft — hands, materials, mechanisms. Buys warmth and time.
• Reaction shot. Someone listening rather than speaking. Cheap to capture in a two-camera interview, and the fastest way to hide a cut.
• Transition shot. A whip pan, a pass-by, a door closing. Its only job is to get you from one place to another without a hard jump.

For screen-based and explainer content, most of these have a motion-graphics equivalent that works better than filming anything: the establishing shot becomes a title card, the insert becomes a callout on the number you just said, the detail shot becomes an animated diagram. The grammar is the same; only the medium changes.

When to use b-roll, by format

The rule of thumb — cut away whenever the frame has stopped earning attention — plays out differently depending on what you're making.

• Documentary. B-roll carries the story between interview segments. It's usually shot deliberately against a shot list, and there's typically far more of it than A-roll. Here b-roll is the film; the interviews are the spine.
• Interview and news. Cutaways and reaction shots exist mainly to make edits invisible. When a 40-minute interview becomes a 4-minute segment, every join needs somewhere to hide. This is the origin of the "editor's safety net" description.
• Online explainer and talking head. The job shifts from storytelling to comprehension and retention. Viewers leave when the frame goes static, and they misread numbers that are only spoken. Motion graphics on the specific claim beat any stock clip.
• Product demo and tutorial. The screen recording is often the A-roll. B-roll becomes the annotation layer: zooms, highlights, callouts on the exact control being discussed.

If you're making the third or fourth kind, the practical question isn't "where do I find footage" — it's "how do I get a visual for every claim I made, at the second I made it." That's a different problem, and it's the one generating b-roll from your subtitles solves.

How much do you need?

Ignore ratios like "30% b-roll." Two practical rules do more work:

• A talking-head shot holds attention for roughly 10–20 seconds before the frame should change.
• Every concrete noun, number, or list in your script is a cutaway opportunity. Mark them in the script; that's your shot list.

Where to get it

The traditional route is a stock library: search, license, download, drag onto the timeline, then trim and slide each clip until it lines up with the right sentence. It works. It's also hours per video, and the result sits near your point rather than on it.

There's a faster route for narrated content specifically. Once you have subtitles for your narration, the .srt file already contains both what you said and exactly when you said it — which is the entire cut list. Ahacut reads that file and generates a full-length motion-graphics b-roll track cut to your timings, which you drop onto your existing timeline in CapCut, Premiere or Final Cut. Because the visuals are built from your timeline rather than fitted to it afterwards, there's nothing left to nudge.

Frequently asked questions

Related: How to add b-roll to videos automatically · How to write a video script · How to write a transcript of a video