Free Online Drum Machine: Build Beats in Your Browser
No download, no login, no latency. Here's how to use a browser-based step sequencer to sketch drum patterns — and some practical beat-building tips to get you started.
The quickest way to test a rhythm idea is to hear it immediately. Opening a DAW, loading a drum plugin, and routing everything through a mixer takes five minutes before you've played a single note. A browser-based drum machine gets you to the beat in about ten seconds.
MusoKit's drum machine is a 16-step sequencer with multiple drum kits and adjustable BPM. It runs entirely in your browser using the Web Audio API — no plugins, no Flash, no app to install. Open it, click some pads, press play.
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How a step sequencer works
A 16-step sequencer divides a bar of 4/4 music into 16 equal steps — one per sixteenth note. Each row represents an instrument (kick, snare, hi-hat, etc.). Click a step to toggle it on; the sequencer fires that instrument when it reaches that step on playback.
The sequencer loops continuously, so after 16 steps it starts again from step 1. This looping is what creates a repeating groove. Change the BPM to speed up or slow down the playback without changing the pattern.
The basic 4/4 drum pattern
Every genre starts from some variation of the foundational 4/4 pattern. Here's the standard rock beat on a 16-step grid:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kick | · | · | · | · | · | · | · | · | · | · | · | · | · | · | · | · |
| Snare | · | · | · | · | · | · | · | · | · | · | · | · | · | · | · | · |
| Hi-hat | · | · | · | · | · | · | · | · | · | · | · | · | · | · | · | · |
Steps 1, 5, 9, and 13 are quarter-note beats 1, 2, 3, and 4. Snare on beats 2 and 4 (steps 5 and 13) is the backbeat. Hi-hats on every other step (every eighth note) drives the groove forward.
Genre-specific starting points
Hip-hop / boom-bap (85–95 BPM)
Kick on steps 1 and 9, snare on steps 5 and 13. Leave space — boom-bap breathes. Add a slightly swung feel by shifting every other hi-hat step one position later. The swing is key to the genre's relaxed, head-nodding feel.
Trap (130–170 BPM)
Place the kick drum in unexpected positions and add a hi-hat roll by enabling 3 or 4 consecutive steps near the end of the bar. The open hi-hat (if available in the kit) on beat 3 or the and of 2 is classic trap. The snare typically only hits on beat 3 (step 9) for the half-time feel.
House / techno (120–130 BPM)
Four-on-the-floor: kick on every quarter note (steps 1, 5, 9, 13). Clap or snare on beats 2 and 4. Closed hi-hats on every 16th note (every step). This is the engine of dance music — deceptively simple, hypnotically effective.
Reggae (70–90 BPM)
The "one drop" rhythm: kick is deliberately absent on beat 1. Kick on beat 3 (step 9), or sometimes just the and of beat 4. Snare on beat 3. This creates the floating, syncopated feel characteristic of roots reggae.
Tips for making patterns feel alive
Patterns built on a perfect grid can feel mechanical. A few techniques push back against that:
- Vary the hi-hat: Instead of every eighth note, try every 16th on the second half of the bar and every eighth on the first. Asymmetry = groove.
- Double the kick: Add a second kick hit one step before beat 3 (step 8) for a rolling, driving feel common in dance music.
- Ghost the snare: If your machine supports velocity, add quiet snare hits on the 16th notes around the main backbeat. They add texture without dominating.
- Use the swing control: A small amount of swing (10–20%) makes a straight pattern feel human without making it sound sloppy.
Frequently asked questions
A step sequencer divides a bar into equal steps — 16 for a bar of 4/4 at sixteenth-note resolution. Each step can be toggled on or off per instrument. The sequencer fires active steps in order, creating a repeating rhythm. This is how classic machines like the TR-808 worked.
Classic boom-bap: 85–95 BPM. Modern trap: 130–170 BPM (though the groove often feels half that). Lo-fi hip-hop: 70–90 BPM. Start in the middle of the range and adjust based on how the pattern feels.
Kick on steps 1, 5, 9, 13 (every beat). Snare on steps 5 and 13 (beats 2 and 4). Hi-hat on odd-numbered steps (every eighth note). That's the foundation — vary from there.
A drum machine is a focused tool for rhythm — fast to use with zero setup. A DAW is a full production environment with recording, mixing, and plugin support. For quickly testing a beat idea, a drum machine gets you there in seconds.
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