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Paste a YouTube, Twitch or Zoom URL instead of downloading. Klap (9 sources), OpusClip (20+), Vizard (13), Katto (6). ClipForge and Submagic: upload only.
An AI video clipper takes a long video, works out which moments will stand alone as shorts, cuts them, reframes them to vertical, adds captions and hands you a batch to post. This guide explains what's happening inside one, which features matter, how to get good output from any of them, what they still get wrong, and how to choose. It links to full reviews of every major tool.
An AI video clipper is software that reads a long video, decides which segments would work as standalone short-form clips, and produces them: cut, reframed to 9:16, captioned, often titled and scored. The judgement is the product. An editor cuts where you tell it; an auto-cutter splits at fixed intervals; an AI clipper picks the 40 seconds out of two hours that a human editor might have picked.
Under the hood, most clippers are the same eight-stage pipeline wrapped in different interfaces and pricing. Some run in a browser (OpusClip, Klap, Vizard), some on your own machine (SupoClip), and some are driven by an AI agent through an API or MCP server (Katto, OpusClip, SupoClip). This guide covers the pipeline first, because once you understand it, every tool's strengths and failures make sense.
Every tool reviewed on this site runs some version of these eight stages. Where they differ is noted.
The tool fetches the file or pulls it from a link (YouTube, Twitch, Zoom, Drive; the list is a key differentiator), transcodes it to a working format and extracts the audio. This is where length caps and upload limits apply, and where credits are usually charged.
Speech-to-text with a timestamp on every word (AssemblyAI, Whisper-class models), plus speaker labels. Word-level timing is what makes word-synced captions and clean cut points possible. Accuracy drops on accents, jargon and crosstalk; a custom dictionary helps where offered.
The transcript is split into candidate windows at sentence and topic boundaries, within your chosen length band (say 30–60 s). Some tools add visual cues (scene changes, chat spikes, reactions) so that gameplay and vlogs without much dialogue still produce candidates; OpusClip's ClipAnything is the clearest example.
A language model reads each candidate and scores it on hook strength, emotional peak, self-containment and fit with your brief or niche, rolled up into a "virality score" (0–100, or 0–99 on OpusClip). It's a ranking, not a prediction: the top five are usually right, the tail isn't. Tools that state a reason per pick (ClipForge, SupoClip) are easier to overrule.
In and out points snap to word boundaries with a little padding so sentences aren't chopped. This is where most clippers are "roughly right": the in-point often lands 3–5 seconds before the actual hook. The fix is a text-based editor where deleting words moves the cut (Vizard, OpusClip, Katto).
A face or subject detector crops 16:9 to 9:16 and follows the active speaker. The better tools classify zones (webcam, screen share, gameplay, second speaker) and compose split-screen or picture-in-picture layouts (Klap's Reframe 2, Katto). Centre-crop-only tools (ClipForge) need a manual nudge on off-centre speakers.
Word-synced captions from the stage-2 timestamps, styled from a template (fonts, colours, emoji, keyword highlight). Then an AI-written hook title, optional stock or AI B-roll, auto-zooms and sound effects. Submagic is the specialist here; most clippers do a good-enough version.
Render to platform presets, schedule through a built-in poster, or return structured results (clip URLs, scores, transcript) to an agent via webhook, API or MCP. Whether this stage exists, and on which plan, is the biggest practical difference between tools.
Paste a YouTube, Twitch or Zoom URL instead of downloading. Klap (9 sources), OpusClip (20+), Vizard (13), Katto (6). ClipForge and Submagic: upload only.
Uses visuals and audio, not just transcript, so gaming and vlogs work. OpusClip ClipAnything; StreamClipping for streams.
A reason per pick, so you can overrule. ClipForge, SupoClip; OpusClip and Klap give a number only.
Delete words to move the cut. Vizard, OpusClip, Katto, Descript.
Split-screen, PiP, gameplay + cam. Klap Reframe 2, Katto; StreamClipping Director Tracking on Elite.
Word-synced, styled, accurate on names. Submagic leads; Vizard translates into 128 languages; Katto 99; OpusClip 20+.
Post without leaving. OpusClip (6, Pro), Katto (7, Creator), Vizard (6), Quso (7), Klap (3). ClipForge, SupoClip: none yet.
API and MCP. Katto (all plans), OpusClip (Pro+), SupoClip (self-hosted), Klap (API only), Vizard (API only).
Credits per minute (OpusClip, Vizard), minutes in (Klap), videos (Katto, Submagic), projects (ClipForge), none (SupoClip). Decides what long sources cost.
Clip new uploads automatically. OpusClip Auto Import; others via API + a scheduled task.
No watermark on free output: SupoClip, CapCut, ClipForge, Klap's one test. See free AI clippers.
Footage stays local: SupoClip with Ollama. Check terms on content licences (Vizard's grant ML use; Klap's opt-in is "in progress").
Where most people start. Nothing to install, a scheduler usually included, billed monthly in credits, minutes or videos. OpusClip, Klap, Vizard, Katto, ClipForge, Submagic, Quso, StreamClipping.
Open-source, Docker, your own API keys and LLM. No quotas, private, tunable. Costs you an evening of setup and API usage. SupoClip is the one to know.
Claude, Cursor or a custom loop creates jobs, polls, filters by score and hands you clips, through MCP servers and APIs. The clipper becomes a tool; the agent runs the brief.
Skip intros, ad reads and outros before processing. Fewer minutes means fewer credits and better picks, because the model isn't scoring filler.
Prompt-first tools (Katto, OpusClip ClipAnything) pick differently for "pricing objections, for founders" than for nothing. Say who the clip is for and what moment type you want.
Open the top five, drag the in-point to the strongest word. It's the single edit that lifts a 60% usable rate to 90%.
30–60 s produces more candidates and better completion than 60–90 s. Let the content earn a longer cut; don't default to it.
Auto reframe follows faces, not slides, demos or reactions. Scrub each clip at 2× before export; move the frame where it missed.
Log views per clip against its score. After a month you'll know which score threshold actually earns for your audience. Then raise the bar. Use the earnings calculator with real averages.
Consistent across tools in 2026, whatever the marketing says.
| If you… | Pick | Because |
|---|---|---|
| Want the most complete autopilot | OpusClip | ClipAnything, scheduler, Auto Import, API + MCP |
| Clip from YouTube links, or gaming/multi-host | Klap | 9 link sources; Reframe 2 layouts |
| Make podcast clips in many languages | Vizard | Text editing, 128-language subtitles, 1 credit = 1 min |
| Want the cheapest plan with agent access | Katto | €4.90/mo annual; MCP, CLI, API on every plan |
| Clip multi-hour sources | ClipForge | Per-project pricing, 4-hour uploads |
| Already have clips, want the best captions | Submagic | Caption styling, auto-editor |
| Stream on Twitch or Kick, or clip for campaigns | StreamClipping | Stream-trained picks, campaign marketplace |
| Need privacy or zero marginal cost | SupoClip | Self-hosted, local LLM, no quotas |
| Post to 7 platforms and want one bill | Quso.ai | Clipper + scheduler + analytics bundle |
| Just need to finish one clip by hand | CapCut | Free, precise, everywhere |
Full rankings: best AI clipping tools · best AI clipping agents · best free AI video clippers.
Good enough to beat random by a wide margin and to make the top five worth watching; not good enough to post blind. Reviewers across tools report 60–70% of candidates publishable with light edits, mostly in-point fixes.
Transcript-only tools can't. Multimodal ones (OpusClip ClipAnything) and stream-trained ones (StreamClipping) use visual and audio cues. Klap and Katto handle the gameplay + cam reframe once a moment is chosen.
Usually one minute of source video (OpusClip, Vizard). Some bill by uploaded minutes (Klap), by videos (Katto, Submagic) or by projects (ClipForge). The unit decides what a long source costs, so check it before the price.
No, but learn two things: moving an in-point and fixing a caption. Those two edits are most of the difference between AI output and a clip that performs.
It will make them faster and more consistent. Virality still comes from the source moment, the hook and the platform. The clipper's score orders candidates; your view data tells you which ones earned.