AI Clipper
ViralMint is a free AI clipper — also called an AI clipping tool, auto clipper or clip app — that turns long videos into viral 30-60 second short clips with one click. Paste a podcast, interview, lecture or livestream URL; the desktop app downloads it locally with yt-dlp, transcribes with Faster-Whisper on your own CPU, and an AI viral-clip picker scores every window for hook strength, narrative arc and shareability. The top picks export as 9:16 vertical mp4s with word-by-word captions burned in. No subscription, no watermark, no per-minute cloud fee — and the full pipeline is open-source on GitHub under AGPL-3.0.
How the AI Clipper scores a clip
{
"tool": "ViralMint AI Clipper",
"scoring_axes": ["hook_strength", "outlier_ratio", "vph", "engagement_rate"],
"outlier_tiers": {
"OUTLIER": "3x channel median",
"STRONG": "5x channel median",
"BREAKOUT": "10x channel median",
"MONSTER": "20x channel median (rare; viral template)"
},
"captions_engine": "faster-whisper int8 (local)",
"caption_style_presets": ["viral", "classic", "bold"],
"max_clip_duration_seconds": 60,
"watermark": false,
"subscription": false
}
Numbers verified against backend/services/outlier_detection_service.py
and the glossary.
What is an AI clipper?
An AI clipper is a tool that takes a long video — a podcast, interview, lecture, livestream replay or earnings call — and auto-detects the moments most likely to perform as short-form clips on TikTok, YouTube Shorts and Instagram Reels. The naïve way to clip long-form content is manually: scrub the video, find a good moment, mark in/out, export, caption. The AI way is one click: a model reads the transcript, scores every candidate 30-60 second window for "viral fit", and you pick from the ranked list. The good AI clippers — sometimes called auto clippers, clip apps or clipping tools — handle the transcription, scoring, cutting, reframing to 9:16, and word-by-word captioning in a single pipeline.
ViralMint's Clip Studio runs the heavy steps locally (yt-dlp download, Faster-Whisper transcription with word-level timestamps, FFmpeg cutting + 9:16 reframing, ASS caption rendering) and only routes the AI viral-clip picker to the cloud. That means a 90-minute podcast doesn't cost you the per-minute transcription fees Opus Clip and Submagic charge — it costs the same as a 5-minute one because the AI call is just over the transcript text, not the audio. Typical end-to-end cost on a 90-minute video is under 20 cents.
AI Clipper Comparison — ViralMint vs subscription tools
| Capability | ViralMint (open-source) | Opus Clip / Klap / Submagic |
|---|---|---|
| Pricing model | Free desktop + pay-per-use top-ups | $19 – $151 / mo subscription |
| Transcription cost | $0.00 — local Faster-Whisper int8 | Counted against monthly minute cap |
| Watermark on free tier | None — local FFmpeg renders clean | Yes on free tiers (Vizard 720p w/ logo) |
| Source video upload | On-device — no video leaves your computer | Server-side upload required |
| Source video duration cap | 2 hours per video, unlimited videos | Capped by plan (60 min / 500 min / etc.) |
| Open source | Yes — AGPL-3.0 on GitHub | No — closed-source SaaS |
| Agent automation (MCP) | Yes — Claude Code chains the full pipeline | Web UI only, no programmatic surface |
Pricing data verified as of May 2026. Competitor list prices change frequently — see each vendor's site for current rates.
How the AI clipper works
- Paste a URL or import a local file. The auto clipper accepts any URL its yt-dlp downloader supports (1,800+ sites including YouTube, TikTok, Douyin, Bilibili, X, Instagram, Reddit, Vimeo, Twitch) or any local mp4 / mov / mkv / webm file.
- Download locally. yt-dlp pulls the source video to your desktop. No upload to a cloud — your raw footage never leaves your machine.
- Whisper transcribes on-device. faster-whisper runs int8-quantized on your CPU. Word-level timestamps mean caption sync is exact, not the 2-second drift typical of cloud transcribers, and the long-video transcription cost is $0.
- AI viral-clip picker scores each window. The clipping tool reads the transcript and scores every 30-60 second window on hook strength, narrative arc, emotional peak density and shareability. Cloud AI call — typically a few cents per long video.
- Export the top picks. Top-scoring windows cut to standalone mp4s, reframed to 9:16 with face-tracking, captioned word-by-word with the viral / classic / bold preset of your choice. Bulk export of N clips as a ZIP with AI-drafted titles + tags is one click.
Why this AI clipping tool is different
No subscription, no watermark
The desktop pipeline (download, transcription, cutting, reframing, caption burn) runs locally — no monthly fee, no logo on output. The AI viral-clip picker is pay-per-use with a daily starter allowance.
Local Whisper transcription
faster-whisper int8 on your CPU. A 90-minute video costs the same to transcribe as a 5-minute one — no per-minute cloud fee, no audio upload.
Transparent virality scoring
Every clip shows hook score, narrative arc score, emotional peak score and shareability score so you can see why the auto clipper picked each moment. Override the AI picks if you have specific moments in mind.
Face-tracking 9:16 reframe
16:9 → 9:16 with OpenCV face detection + smooth tracking. Speaker stays centered even when they move across the frame. Manual frame fixup if needed.
Word-by-word captions
Whisper word-level timestamps drive ASS subtitle rendering. Three presets — viral (yellow highlight, Montserrat Bold 56pt), classic (Arial 42pt), bold (Impact 64pt green). Customizable per channel.
1,800+ video sources
yt-dlp handles YouTube, YouTube Shorts, TikTok, Douyin, Bilibili, X, Instagram, Reddit, Vimeo, Twitch, Dailymotion, Facebook, Rumble, Kick. Same auto-clip pipeline on every source.
AI clipper vs subscription clip apps
The best-known AI clipping tools — Opus Clip, Klap, Submagic and Vizard — all run their entire pipeline (download, transcription, AI scoring, captioning) in the cloud and charge monthly subscriptions with caps on minutes processed. Opus Clip's Starter is $19/mo for 60 minutes; Klap's Pro is $63/mo annual; Submagic's Pro is $23/mo. For high-volume users producing 50+ long videos a month, those subscriptions can be cost-effective. For everyone else — most creators, marketing teams running quarterly podcasts, or anyone evaluating an AI clipper before committing — the per-minute charge structure penalises occasional use.
ViralMint's hybrid local + cloud architecture inverts that economics. The download (yt-dlp), transcription (Whisper), cutting (FFmpeg), reframing and captioning all run locally with no per-minute cloud fee. Only the AI viral-clip picker is a cloud call, and it's cheap because it runs over the transcript text, not the audio. Typical end-to-end cost on a 90-minute podcast is under 20 cents at ViralMint; a comparable run on Opus Clip Starter consumes ~1.5× your monthly minute allotment. For per-vendor comparison detail, see /alternatives/opus-clip/, /alternatives/klap/, /alternatives/vizard/ and /alternatives/munch/.
Frequently asked
What is an AI clipper?
An AI clipper is a tool that takes a long video — a podcast, interview, lecture, livestream replay or earnings call — and auto-detects the 30 to 60 second moments most likely to perform as short-form clips on TikTok, YouTube Shorts and Instagram Reels. The AI reads a transcript of the video, scores each candidate segment for hook strength, narrative arc and standalone value, and cuts the top picks as vertical-formatted mp4s with captions burned in. The good AI clippers handle transcription, scoring, cutting, reframing to 9:16, and word-by-word captioning in a single one-click pipeline.
Is there a free AI clipper without a watermark?
Yes. ViralMint's Clip Studio is a free, open-source AI clipping tool that runs the heavy steps (download, Whisper transcription, FFmpeg cutting, 9:16 reframing, caption burn) locally on your desktop with no watermark and no per-minute cloud fee. The cloud AI viral-clip picker is billed per use via prepaid top-ups, with a daily starter allowance for new accounts. By comparison, Opus Clip costs $19/mo, Klap costs $23/mo annual and Vizard's free tier outputs at 720p with a Vizard watermark.
What's the difference between an AI clipper and an auto clipper?
The terms are used interchangeably. "AI clipper" emphasises the AI scoring model that picks viral moments; "auto clipper" emphasises the one-click automation (no manual in/out marking). In practice every modern AI clipper IS an auto clipper — the AI is what makes the automation possible. Tools sometimes called "clip apps" or "clipping tools" (Opus Clip, Klap, Submagic, Vizard, ViralMint) all do the same thing under different labels: transcribe a long video, AI-score 30-60s windows, export the top picks as captioned vertical mp4s.
How does an AI clipper score viral moments?
Most AI clippers score each candidate clip on four signals: hook strength (does the opening 2-3 seconds earn the scroll-stop?), narrative arc (does the segment have a clear setup → payoff structure that completes without prior context?), emotional peak density (laughter, surprise, vulnerability, contrarian takes), and shareability (would a viewer quote or screenshot this?). ViralMint exposes the sub-scores on every clip so you can see why a moment was picked. Different clippers weight these signals differently — head-to-head clip quality varies by source content.
What video formats and sources does the AI clipper support?
ViralMint accepts any common video file as a local import (mp4, mov, mkv, webm, m4v) or any URL its yt-dlp downloader supports — that's 1,800+ sites including YouTube, YouTube Shorts, TikTok, Douyin, Bilibili, X (Twitter), Instagram, Reddit, Vimeo, Twitch, Dailymotion, Facebook, Rumble, Kick and more. Source duration cap is 2 hours per video. Output is 9:16 vertical mp4 by default; multi-aspect bundle export emits 9:16 + 16:9 + 1:1 together if you cross-post.
Try the AI clipper free
The desktop app is open-source and runs the full pipeline locally — download, transcribe, score, cut, reframe and caption-burn. The browser portal covers the lightweight AI features (chat, image, voice, music) with a shared account. Sign up takes 30 seconds, no card.