Beat Detector — Markers for After Effects & Premiere
Drop a song and get its tempo and a marker on every beat, spaced to suit a fast or a slow edit. Export markers for After Effects and Premiere Pro, or generate a black video with a white flash on each beat and drop it straight onto your timeline.
Your files stay on your device: they are processed in this browser tab’s memory and never uploaded.
How it works
The song is decoded in your browser, its rhythm is analysed and a steady beat grid is fitted to the whole track. Choose an edit pace and the markers are placed across the entire song: every half beat for a very fast edit, down to one marker every two bars for a slow one.
Flash video instead of scripts
Generate an MP4 that is pure black, with pure white frames on each marker, in your project’s size and frame rate. Put it on the top track, cut wherever it flashes, then delete it. The music can be included so it lines up by itself.
FAQ
How do I import markers into After Effects?
Open your composition, then choose File > Scripts > Run Script File and pick the downloaded .jsx. The markers are added to the active composition.
How do I import markers into Premiere Pro?
Choose File > Import and pick the downloaded .xml. Premiere creates a new sequence that holds the markers; add your music and footage to it.
What if the detected BPM is half or double?
Dance music is often felt at two speeds. Use the ÷2 and ×2 buttons to switch, and the markers follow.
Is my music uploaded?
No. The song is analysed and the video is made inside this browser tab.
What can you do with a beat detector?
Editors cut music videos, travel montages and Reels exactly on the beat without tapping markers by hand; motion designers drive animations from a marker on every kick; DJs and producers check the tempo of a track; and anyone who would rather not touch a script can lay the black-and-white flash video above their footage and cut wherever it flashes.