How to Make YouTube Shorts from an Existing Video or Stream

To make a YouTube Short from footage you already have, pick one moment that makes sense on its own, cut it to 3 minutes or less, frame it vertically (9:16) so the action stays in view, check the audio and captions, and upload it. YouTube treats any square or vertical video up to 3 minutes as a Short, so the shape and length of your export decide most of the outcome.

How much work sits in front of that upload depends on your source. A 40-second clip you’ve already trimmed needs a reframe and a polish. A four-hour stream recording needs you to find the moment first, and that search is usually the slow part.

Choose the right workflow for your footage

The first row is an editing problem. The last two are search problems followed by an editing problem, and the tools for each are different.

How to make a Short from an existing video

Use this when you already know which moment you want, whether it’s a gameplay recording or a clip saved from a stream.

1. Pick a moment that stands alone. Viewers scrolling past have none of your video’s context. A clutch round, a funny reaction, or a clear tip works; a moment that needs the previous ten minutes doesn’t.
2. Set up a 9:16 canvas. Create a vertical project first, then place your footage in it. If you crop a 16:9 recording into 9:16, decide what the frame should follow: the crosshair, the player character, or your facecam.
3. Cut the dead time. Start as close to the action as you can and end right after the payoff. The first and last two seconds are where most clips drag.
4. Check audio, captions, and overlays. Balance game audio against your mic, add captions if you talk through the clip, and keep text away from the edges of the frame.
5. Export and upload. Keep the file at 3 minutes or less and in a square or vertical shape. YouTube’s help page says Shorts can be uploaded at a maximum resolution of 1080p, so a 1080 × 1920 export is a sensible target.

If the source is a long-form video that’s already public on your own channel, YouTube offers a shortcut. On the video’s watch page in the YouTube app, tap Remix, then Edit into a Short, and select up to 60 seconds. YouTube’s help page limits this to your own public long-form uploads. Private videos, unlisted videos, and videos with third-party copyright claims can’t be used, and the finished Short links back to the original.

How to make Shorts from a long video or stream

With a long recording, the editing is the easy half. Finding the 30 seconds worth posting in a three-hour stream is the real work.

• Scrub it yourself. Note timestamps, export each segment, and edit it as above. It’s slow, but it works for any source.
• Use YouTube Studio’s Clips and Shorts tool. If the long video is already on your channel, YouTube Studio lets you pick a segment by selecting text in the transcript or entering timestamps. YouTube says AI-suggested moments are available only in select countries and languages, so don’t count on them.
• Use a highlight-detection tool. These scan a recording for likely moments and hand you a list of clips to review.

For gaming streams, Eklipse turns long videos into short clips by scanning a VOD for in-game cues, mic volume spikes, and chat velocity. You can connect a Twitch, YouTube, Kick, or Facebook account so recordings are fetched after each stream, import a publicly accessible YouTube video by URL, or upload an MP4. Each route has its own limits:

• Twitch: streams from 15 minutes to 5 hours, broadcast in the last 14 days
• Manual upload: MP4 files from 15 minutes to 4 hours, under 10 GB
• YouTube link: the video has to be publicly accessible, and you choose a content type (Gaming, Podcast, IRL / Just Chatting, or Variety)

Most streams finish processing in minutes, though a four-hour VOD can take up to an hour. Treat the results as a shortlist. Eklipse’s own help docs call the AI selection a starting point, and you can adjust each clip’s start and end points in Eklipse Studio before exporting. Producing and exporting clips requires an Eklipse Premium plan.

Edit the clip for vertical viewing

Cropping a widescreen game into a tall frame throws away about two-thirds of the picture, so the crop has to be deliberate.

• Follow the action, not the center. In a shooter, keep the crosshair and the enemy in frame. In a platformer or racing game, keep the character and enough of the path ahead to read the moment.
• Watch the HUD. A kill feed, scoreboard, or minimap often sits in a corner that a center crop cuts off. If that element is the point of the clip, move the frame or place it in a separate panel.
• Split facecam and gameplay when it helps. A stacked layout with your camera on top and gameplay below keeps reactions in view without shrinking the game to nothing.
• Check it on a phone. Watch the full clip on a phone-sized screen before you upload. Text that’s readable on a monitor can be too small at that size.

If you already have the clip and want help with the vertical edit, Eklipse’s YouTube Shorts editing workflow covers it. Eklipse Studio offers vertical layout templates, a facecam and game feed layout, trimming, text, and auto-captions you can edit. AI Edit takes a Twitch or Kick clip URL, a clip from your AI Highlights library, or an MP4 upload under 1 GB, as long as the clip runs 15 seconds to 3 minutes, and reframes it vertically with captions. When you’re done, you can download the file or share it to a linked social account from Studio.

For a single clip and no account, the free Eklipse AI Reframe browser tool accepts a Twitch clip URL, a direct .mp4 or .webm link, or an MP4, WEBM, or MOV upload, and exports 9:16, 4:5, or 1:1. It can’t read YouTube links, so download your footage first if that’s where it lives.

Upload and check your Short

From a computer, sign in to YouTube Studio, click Create, then Upload videos, and select your file. Before you publish, run through this list.

• Length and shape: 3 minutes or less, square or vertical. A 16:9 file uploads as a regular video.
• Framing: the subject and any key HUD elements are visible in every second of the clip.
• No black bars: bars mean the footage and the canvas don’t match. Fix the canvas instead of uploading as-is.
• Readable text: captions and overlays are legible on a phone and clear of the edges.
• Clear audio: your voice isn’t buried under game sound, and nothing clips or peaks.
• Copyright: YouTube blocks Shorts longer than one minute that carry an active copyright claim, including Content ID claims. If a clip uses music or footage you don’t own, clear it or keep the Short under a minute.
• Title and description: both describe what actually happens in the clip.

Frequently asked questions

Can I make a YouTube Short from a long video?

Yes. Cut a segment of 3 minutes or less, frame it square or vertical, and upload it. If the long video is public on your own channel, YouTube’s Edit into a Short option lets you select up to 60 seconds of it directly in the app, and the Short links back to the original.

Can I make Shorts from a livestream recording?

Yes, as long as you have the recording as a file or a supported VOD. Cut each highlight to 3 minutes or less and reframe it vertically. YouTube’s help pages for Edit into a Short and Studio clips don’t say whether past live streams are supported, so exporting the recording and editing it yourself is the reliable route.

Should I crop a video to 9:16 before uploading?

Yes, if you want it to fill the phone screen. YouTube accepts square video as a Short, but only 9:16 fills a vertical player. Crop it yourself so you choose what stays in frame.

What is the difference between turning a long video into clips and editing a clip for Shorts?

Turning a long video into clips means finding moments worth posting. Editing a clip for Shorts starts once a moment is chosen and covers the vertical crop, trim, captions, and export. Long recordings need both steps; a clip you’ve already cut needs only the second.