How does the clipper pick viral moments?

Cutflux scores each segment using audio energy, cut density, and hook signals, then ranks the top moments and cuts them into vertical shorts.

What input formats work?

MP4, MOV, and WebM. Long-form podcasts, streams, and gameplay all work best when clearly voiced.

Is the output watermarked?

No. Exports up to 1080p vertical are watermark-free.

Do I need to install anything?

No. The clipper runs entirely in your browser using ffmpeg.wasm and Web Audio.

Long-form Clipper, Cutflux

Drop a video or click to upload

MP4, MOV, WEBM · up to ~30 min recommended

100% in-browser · nothing uploads to a server

Clips

Length

Format

Finding the moments

Scanning the audio for laughter, emphasis and energy spikes…

Loading engine

Extracting audio

Analyzing energy & onsets

Scoring viral moments

Rendering clips

Analysis complete

Your top clips

Caption style — auto-transcribes on upload · toggle per clip below

Hype · 87Each pill is a hype score — we rank every second by energy, onsets, and voice, then bubble the top moments to the top.

DownloadPreviews are lightweight. Tap Download and we render that clip at full HD 9:16 for TikTok/Reels/Shorts.

How it ranks: per-frame audio energy, onset density, dynamic range, and voice activity, the same signal stack our beat-sync engine uses, retuned for hype detection.

100% in-browser: your video never leaves your machine. Web Audio analyses the soundtrack, ffmpeg renders the crops. No upload, no servers.

Tip: 10-30 minute videos finish in 30-90 sec on a recent laptop. Long videos work, just take proportionally longer to render the chosen clips.

Long-form → viral shorts

Drop a video or click to upload

Finding the moments

Your top clips