How to Make YouTube Shorts from Long Videos
YouTube Shorts are the fastest way to grow a YouTube channel — and the best Shorts come from your existing long-form content. Here is the full workflow.
Why Shorts from long-form content outperform original Shorts
Creating original Shorts from scratch requires a separate creative brief, filming session, and editing workflow for each one. Extracting Shorts from existing long-form content requires only clipping, cropping, and captioning — work that takes 15–20 minutes per Short instead of hours.
Beyond efficiency, extracted Shorts have a structural advantage: they contain proven content. Your long-form video already demonstrated that a topic resonates with your audience. Extracting the best moments gives you a Short built on material that has been through at least one round of validation.
Step 1: Transcribe the long-form video
The fastest way to find the best Short candidates in a 20-minute video is not to rewatch it — it is to read the transcript. Scanning text for sharp, standalone moments takes a fraction of the time that scrubbing through video requires.
Paste the YouTube URL into TranscribeVideo.ai and get the full transcript in under a minute. The transcript includes timestamps, which you will need to find the exact clip location in the video file.
Step 2: Identify hook moments in the transcript
A good Short candidate has a clear structure: a hook in the first 3 seconds, a complete standalone idea in 30–60 seconds, and a natural ending that does not feel cut off. In the transcript, look for passages with these characteristics:
- Sharp opinions: "Most creators get this completely wrong." Opinionated statements stop scrollers.
- Surprising statistics or claims: "85% of videos on YouTube have never been watched to completion." Surprising facts create a reason to keep watching.
- Numbered lists: "Three things I do every morning" — this format promises a complete payoff and performs consistently well in short-form.
- Before/after stories: Any passage that starts with a problem and ends with a resolution within 60 seconds.
- Quotable lines: Single sentences that are more memorable and shareable than anything around them.
Highlight 3–5 transcript passages that fit these criteria. These are your Short candidates for the week.
Step 3: Clip and crop for vertical format
YouTube Shorts must be in a 9:16 vertical aspect ratio (1080 x 1920 pixels) and no longer than 60 seconds. Most long-form YouTube content is filmed in 16:9 horizontal format, which means you need to crop or reframe the footage for vertical.
Using CapCut
CapCut is a free desktop and mobile editor with built-in vertical crop and auto-captions. Import your video clip, use the "smart crop" or "auto reframe" feature to track the speaker's face in vertical format, then add captions automatically. CapCut's auto-captions are reasonably accurate, but verifying them against your transcript takes 2 minutes and catches errors that could undermine the Short's professionalism.
Using Opus Clip
Opus Clip uses AI to automatically identify the strongest 30–60 second moments in a long video and generates cropped, captioned Shorts automatically. Upload your video or paste the YouTube URL. Opus Clip typically identifies 5–10 Short candidates per video within minutes. Review its selections against your transcript-identified candidates — the combination is more reliable than either method alone.
Step 4: Add accurate captions
Shorts watched without sound are an enormous portion of total views. Accurate captions are not optional. Both CapCut and Opus Clip generate auto-captions, but they will contain errors — especially for technical terms, names, and non-standard pronunciation.
Compare the auto-generated captions against the relevant section of your transcript and correct any errors before publishing. This takes 2–3 minutes per Short and noticeably improves retention for silent viewers.
Step 5: Write the Short title and description
Shorts appear in YouTube search, so title optimisation matters. Use the hook line from the Short as the basis for the title — it should make the value of the Short clear in 5–8 words. Add a description with a link back to the full video: "Watch the full video: [link]". This drives viewers who want more depth to your long-form content, converting Short viewers into long-form subscribers.
Publishing cadence for Shorts
Most recommendations suggest posting 1–3 Shorts per week as a consistent cadence. For a creator publishing one long-form video per week, a batch of 3–5 Shorts from that video's transcript is achievable within a single production session. Schedule them across the week to maintain consistent presence in the Shorts feed.
FAQ
Does YouTube penalise channels that post Shorts alongside long-form content?
No. YouTube has confirmed that Shorts and long-form content are separate surfaces with separate ranking systems. A Short that performs poorly does not hurt your long-form videos and vice versa. The subscriber gained from a Short may or may not watch your long-form content — that is a conversion challenge, not an algorithm penalty.
How long should a YouTube Short be?
YouTube Shorts can be up to 60 seconds (180 seconds if you have certain access, but 60 is the standard). Research consistently shows that 30–45 second Shorts have higher completion rates than 55–60 second Shorts. If your candidate clip is slightly over 60 seconds, tighten the edit rather than trying to stretch the limit.
Can I reuse the exact same clip on YouTube Shorts, TikTok, and Instagram Reels?
Yes, though each platform has slightly different caption formatting and trending audio expectations. The core clip is reusable — upload to all three. Remove the TikTok watermark if posting to YouTube Shorts or Reels, as both platforms suppress watermarked content in their algorithms.