How to add B-roll to your video with ClipoStack
B-roll is supplementary footage layered over your main clip — city streets while you talk about travel, a coffee pour while you describe a morning routine. It keeps viewers watching on TikTok, Reels, and Shorts.
ClipoStack marks exact cutaway moments on your timeline after upload. You pick stock or library clips for each slot instead of hunting timestamps by hand.
Seven steps in the studio
- Upload your clip — drop an MP4, MOV, MKV, AVI, or WebM file into the studio. Transcription and edit-plan generation start automatically.
- Review B-roll slots on the timeline — orange blocks mark cutaway moments. Each slot shows AI-suggested stock keywords tied to what is being said at that beat.
Orange blocks on the timeline are B-roll slots suggested by the edit plan. - Open a slot — click a B-roll block on the timeline to open the B-roll & library drawer for that moment.
Click a timeline slot to open the B-roll & library panel for that moment. - Search and preview — results come from your saved library and Pexels stock. Hover thumbnails to preview; edit keywords if the search needs refinement.
Search merges your saved clips with Pexels stock; hover to preview. - Apply a clip — click Use this clip, then choose Fit (letterbox — full frame visible) or Fill (crop to cover the frame).
After you pick a clip, toggle Fit or Fill and adjust timing if needed. - Fine-tune (optional) — drag slot timing on the timeline, shift-select a range to Refresh B-roll suggestions, or delete and replace slots.
- Render — export an MP4 with burned-in captions and cutaways in one click — ready to post.
Tips for better cutaways
- Place B-roll on emotional beats. Storytelling peaks — pain points, aspiration, action — land better than covering every sentence.
- Build a reusable library. Stock clips you download stay in your asset folder and show up in future projects.
- Start from structure, add taste. The AI proposes slots and keywords; you choose clips and timing. Nothing is locked.
Common questions
Do I need to find B-roll timestamps myself?
No. After transcription, the edit plan marks cutaway slots on the timeline with search keywords for each moment.
Can I use my own clips?
Yes. Upload clips to your library or pick from stock search — both appear in the B-roll drawer.
What if I disagree with slot placement?
Drag slot timing, refresh suggestions for a range, delete slots, or replace clips — the plan is fully editable.
Want the full pipeline? See How it works for upload through export.