AI b-roll generator: clips placed on the words you say

What is an AI b-roll generator?

• It reads the transcript of your video to see what you are talking about.
• It finds clips that match those words, from your own uploads or a stock library.
• It places each clip over the moment you say the matching words.
• Some tools make brand-new footage from a text prompt instead. Cutroom does not.

How Cutroom picks and places b-roll

• Cutroom puts clips on words it can show, like a product, a number, a place or a result.
• It leaves abstract words like 'therefore' alone, because a stock clip there shows nothing.
• Each clip starts on its words and stops at the end of the phrase. A shorter clip ends early, and you are back on screen.
• Clips are never slowed down or looped to fill a gap.
• A clip can fill the whole screen. It can also play in a small box, along the bottom or in a tilted box, so you stay visible while it plays.
• You can highlight any phrase yourself, and a clip plays over exactly those words.

Where the clips come from

• Your own uploads are used first, so your product, your shop and your people appear where the words fit.
• Stock clips come from Pexels and Pixabay, two free libraries with millions of clips.
• You can swap any clip for free, or search the stock clips yourself and pick one.

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How much of the video is b-roll

• Cutroom limits b-roll so you stay on screen for about half the video.
• Once the limit is reached, Cutroom adds no more clips. It keeps the ones that match your words best.
• Clips you add yourself by highlighting a phrase can go past the limit.
• On Flow, a 20-second video gets at most 9 seconds of b-roll.
• A 90-second video on Flow gets at most about 40 seconds of b-roll.
• One switch in the editor turns b-roll off for a video, so you are on screen the whole time.

Adding b-roll by hand vs with Cutroom

• In Cutroom each clip stays on its words, so moving a clip means highlighting the new words, not lining it up by hand.
• In both, you can choose every clip yourself. In Cutroom, swapping a clip is free.

What Cutroom's b-roll cannot do

• It only adds b-roll to a video it edits for you, up to 3 minutes long.
• It exports vertical 9:16 MP4s only, so it does not suit YouTube videos, podcasts or webinars.
• It always adds captions too, and shortens pauses on Punch and Native, so it cannot add only b-roll to a video you already finished elsewhere.
• It does not create new footage with AI. Runway does that.

What it costs

Which AI b-roll generator should you choose?

• Choose Runway if you need shots that do not exist yet, made from a photo or a text prompt.
• Choose Submagic if you caption lots of short clips and want b-roll and zooms added at the same time.
• Choose Jupitrr if you are a coach or consultant. It edits your video on upload and matches Getty and iStock clips to your script.
• Choose OpusClip if you cut long videos into short clips. Its Starter plan includes 3 AI b-roll clips a month, and Pro has more.
• Choose Cutroom if you make short vertical ads from one video of you talking, up to 3 minutes long, and want each clip on the exact words.