The free video editor with an actual beat detector.
Most "beat sync" features in free editors are a metronome at one estimated BPM. Cutflux runs onset detection on the song and snaps every cut to a real percussive event. Songs drift; static grids don't follow. Cutflux does.
What "beat sync" actually means
Three levels of beat sync, ranked from worst to best
1. Static BPM grid. The editor tags one BPM (often wrong by ±2) and lays a metronome under the song. Every cut snaps to that grid. Most "free beat sync editors" stop here. The grid drifts off the real song within 30 seconds.
2. Tap tempo. You tap along, the editor averages your taps. Better than static, but your taps inherit your own latency, and tempo changes in the song break it.
3. Onset-detection beat tracking. The editor analyses the song's audio for percussive events (the actual hits), then a dynamic-programming step picks the most musically plausible beat sequence. Beats are anchored to real audio events, not estimated time. This is what Cutflux does.
Why this matters for short-form
Drops actually land
If your beat detector is off by 80ms, every drop in your video feels late. Onset-locked beats put cuts on the actual hit, not near it.
Tempo changes survive
Songs with builds, breakdowns, or live drumming change tempo. A static grid can't follow; onset tracking does.
The first beat is right
Most BPM detectors lock onto the second downbeat. The first cut is always slightly off. Onset tracking finds the real first hit.
Edits read as musical
The single biggest signal viewers use to decide "this is a good edit" is whether the cuts land on hits. Beat-locked edits feel intentional; off-beat edits feel sloppy.
Cutflux vs other "beat sync" features
| Editor | Beat-sync method | Locked to real onsets | Handles tempo drift | Cost |
|---|---|---|---|---|
| Cutflux | DP beat tracker on onset envelope | yes | yes | free |
| CapCut "Auto-cut to beat" | BPM grid (Pro tier) | no | no | $19.99/mo Pro |
| Premiere Pro | Manual markers (audio waveform visible) | You decide | You decide | $22.99/mo |
| BeatEdit for Premiere | Onset detection plugin | yes | partial | ~$70 one-time |
| Veed.io "Beat Sync" | BPM grid | no | no | Pro tier |
| Resolve "Markers from audio" | Energy peaks, manual | partial | You decide | free |
What you can build with beat-locked cuts
Dance edits
Every move lands on a snare. Choreography reads as crisp.
AMVs
Action beats line up with anime frames. The genre that invented this.
Music videos
Cuts on the bar, not "near the bar". Watch any pro MV, every change is on a beat.
Workout / hype
Reps cut to the kick. Energy follows the song's energy instead of fighting it.
Gaming highlights
Kill-cam impacts on the drop. Frags carry the song.
Podcast clips
Quote cuts under a beat, the same trick news shows use for cold opens.
Photo montage
One photo per beat. Instant rhythm out of stills.
Product reels
Each angle lands on a hit. Looks like a brand video without a brand budget.
How to make a beat-synced video in Cutflux
Step 1. Open the Beat Timeline editor. No login, no install.
Step 2. Drop your video clips into the timeline. Any length, any order.
Step 3. Drop your song. Cutflux runs onset detection and shows the detected beats as markers on the timeline.
Step 4. Click "Snap to beat". Every cut moves to the nearest detected beat. Drag any cut to override.
Step 5. Export 1080p. No watermark, no preroll, no upsell.
Frequently asked
What is beat sync in video editing?
Beat sync means every cut in your edit lines up with a beat in the underlying music. Done well, the edit feels musical and the energy lifts on each drop. Done poorly (a BPM grid that drifts off the actual song), every cut feels a beat early or late.
How does Cutflux's beat tracker work?
Cutflux runs an onset-detection function over the song's spectral flux, then a dynamic-programming step finds the most likely beat sequence given those onsets. The result is a beat list anchored to real percussive events in the audio, not an estimated constant BPM.
Why do other editors' beat sync features fail?
Most free editors estimate one BPM for the whole song and lay down a metronome. Real songs drift, tempo wobbles in live recordings, drops change feel, intros are slower. A static BPM grid stays static; the song doesn't.
Can I override the detected beats?
Yes. The Beat Timeline editor lets you drag any detected beat, add manual markers, or skip beats. The tracker gives you a starting point that's usually 90% right.
Does Cutflux work on any song?
It works best on music with clear percussion. Ambient music, classical, and a-cappella vocals are harder, onset detection has less to lock onto. For most short-form music (pop, hip-hop, EDM, indie), it works very well.
Is the beat tracker free?
Yes. Free, browser-based, no login, no watermark on 1080p exports. No paywalled tier.
Does Cutflux upload my song to a server?
No. Onset detection runs in the browser using the Web Audio API. Your song never leaves your machine.