Shorts Lab
Langes Video ablegen → KI erkennt den besten 30-Sekunden-Hook → crop to 9:16 vertical → burn TikTok-style subtitles → download MP4. Everything runs in your browser. Free alternative to OpusClip and Munch.
Video hierher ziehen
MP4, MOV, WebM — jedes Format das Ihr Browser abspielen kann
Beste Ergebnisse: 2–20 Minuten Talking-Head oder Interview-Inhalte
Whisper KI-Transkription
Transkription ermöglicht die Erkennung des besten Hooks und die Untertitelerzeugung. Überspringen wenn keine Untertitel benötigt.
Select the spoken language for accurate subtitles.
First-time download only · cached in browser afterwards
Transcript
↕ Drag on preview to reposition crop
✨ AI-Suggested Hooks
Click to jump to the best 30s windows detected by AI.
Hooks appear after transcription.
🎬 Frame & Crop
Or drag the preview above to fine-tune manually.
💬 Subtitle Style
📝 Edit Subtitles
Click any segment to fix transcription errors.
Transcript appears here after transcription.
Short exportieren
The free alternative to OpusClip and Munch
Tools like OpusClip and Munch charge $20–150/month to take a long video, find the best moments, reframe to 9:16 and add subtitles. They process everything on their servers with a monthly clip quota. Shorts Lab does the same workflow entirely in your browser, with no monthly limit and no server costs — because your CPU does all the work.
Der 4-Schritt-Workflow
- Upload — drop any video file. MP4, MOV, WebM — anything your browser can play.
- Transcribe — Whisper AI (same model used by OpenAI's API) transcribes the audio with word-level timestamps. Or skip this step if you just want the crop.
- Edit — the AI suggests the 3 most "hook-worthy" 30-second windows based on speech density. Pick one, or drag the timeline handles to any custom range. Preview with live subtitle rendering.
- Export — WebCodecs encodes a full-quality MP4 with subtitles burned in, ready to upload to TikTok, Instagram Reels or YouTube Shorts.
Hook-Erkennung
We use a sliding-window algorithm that scores each 30-second segment by the number of words spoken per second. High speech density correlates with high-energy moments — the parts where the speaker is most engaged, making their point, or delivering value. The top 3 windows are ranked and shown as clickable suggestions.
Untertitel
Subtitles are rendered directly onto the video frames during export using the Canvas API. Three styles are available: TikTok (bold text on a semi-transparent box, yellow accent — the most viral-looking style), Minimal (white text with a drop shadow, clean and readable), and Solid Box (colorful background, high contrast).
Datenschutz
Your video never leaves your device. All transcription, cropping and encoding happen locally using WebAssembly and WebCodecs. The only network requests are the one-time model downloads (Whisper model from HuggingFace, both cached by your browser after the first run).
Einschränkungen
- Export requires WebCodecs — Chrome/Edge 94+ or Safari 16.4+.
- Transcription requires a model download (75–145 MB) on first use.
- Encoding speed depends on your CPU — expect 1–3 minutes per 30-second clip.
- Very long videos (>60 min) may run out of browser memory during audio decoding.
Häufig gestellte Fragen
- Was ist Shorts Lab?
- Ein Tool zur Konvertierung von Querformat-Videos in das vertikale 9:16-Format für YouTube Shorts, TikTok und Instagram Reels.
- Fügt es Wasserzeichen zu meinen Videos hinzu?
- Nein, die Ausgabe ist sauber ohne Wasserzeichen oder Branding.
- Kann ich den Zuschnitt vor dem Export in der Vorschau sehen?
- Ja, sehen Sie eine Live-Vorschau, wie Ihr Video im Hochformat aussehen wird.
- Werden Videos auf einem Server verarbeitet?
- Nein, alles läuft lokal in Ihrem Browser für maximale Privatsphäre.
- Ist Shorts Lab kostenlos nutzbar?
- Ja, unbegrenzte Konvertierungen ohne Kosten oder Anmeldung.