How do I read a step grid?

Each column is one step in time, moving left to right. Each row is one drum. A mark means that drum is hit on that step. Reading down a column tells you everything that happens at that instant.

How many steps are in a bar?

It depends on the time signature. 4/4 divided into sixteenth notes gives sixteen steps; 6/8 gives twelve; 7/8 gives fourteen. Assuming sixteen is the mistake most pattern grids make.

Can I use these patterns in music I release?

Yes. A drum pattern is a rhythm, and short rhythmic patterns are not protected by copyright. Nothing generated here carries any restriction from us.

Why is the hi-hat not randomised?

Because a randomly placed hi-hat reads as a mistake rather than a choice. Its job in most patterns is to state the subdivision steadily, so the tool keeps it regular and randomises the parts where variation actually sounds like a groove.

Random Drum Pattern Generator

Lays out a drum pattern on a step grid — the same way a drum machine or a DAW shows one — so you can read it, play it or program it. The pattern is generated bar by bar within the time signature you choose, so what comes out is always a complete bar rather than a loop that runs short.

Time signature

Bars

Between 1 and 16.

Difficulty

Seed (optional)

A word makes the exercise reproducible, so a whole class can be set the same bars.

Your drum pattern will appear here.

What this generator does

Produces a grid where each row is a drum and each column a step in the bar. Reading down a column tells you what is hit at that moment; reading across a row tells you what one drum is doing through the bar. It is generated within the time signature rather than as a fixed sixteen steps, which is why it works in 6/8 and 7/8 as well as 4/4 — a great many pattern generators assume four-four and silently break everywhere else.

How to use this tool

Choose a time signature and how many bars.
Choose the difficulty, which controls how busy the pattern gets.
Press Generate pattern.
Read it left to right — each column is one step, each row one drum.

Understanding the controls

Time signature: Sets how many steps a bar has and how they group. 4/4 gives sixteen sixteenth-note steps in four groups; 6/8 gives twelve in two groups of three, which is why the grid looks different.
Bars: How many bars in the pattern. Two bars lets a fill or a variation happen in the second, which is closer to how real parts are written.
Difficulty: Easy keeps the kick and snare on the strong beats with a steady hi-hat. Medium moves the kick off the beat. Hard adds syncopation across the kit and more open space, which is harder to play and usually more interesting.
Seed: Makes the pattern reproducible, so you can recover one you liked or hand the same one to a student.

Worked examples

4/4 easy: Kick on 1 and 3, snare on 2 and 4, hi-hat on every quaver — the pattern behind an enormous amount of popular music.
4/4 hard: Kick on 1, the 'and' of 2 and the 'a' of 3; snare on 2 and 4; hi-hat with gaps. Much harder to play and far more interesting.
6/8: Kick on the two dotted beats, hi-hat on all six quavers, snare on beat two — a compound-time feel rather than a straight one.

Common use cases

Practising reading a step grid, which is how most modern drum parts are written
Programming a beat when you want a starting point rather than a blank sequencer
Drummers working on independence between limbs
A producer looking for a pattern that is not the one they always reach for
Teaching how a groove is built from separate parts rather than one line

How this generator works

The bar is divided into subdivision steps by the time signature — sixteen in 4/4, twelve in 6/8 — and each drum is filled independently within that grid. The kick and snare are placed as a rhythm that must total the bar exactly, the same construction the rhythm generator uses, so a pattern is never short or over-full. The hi-hat is laid on a regular subdivision, because that is what a hi-hat almost always does and randomising it produces something that reads as a mistake rather than a groove.

Randomness and fairness

Kick and snare placement is drawn with the browser's cryptographic random number generator, constrained so the bar totals exactly. The hi-hat is not random — it follows a regular subdivision chosen by the difficulty. A seed switches to a reproducible generator so a pattern can be recovered from a word.

For how randomness is produced across the whole site, see how Generate Random works.

Limitations and good to know

There is no audio. The pattern is a grid to read or to enter into a sequencer, not something you can hear here.
Only kick, snare and hi-hat are generated. Toms, crashes, rides and fills are the parts that make a drum part personal, and they are left to you.
Nothing here knows whether a pattern is physically comfortable to play — a hard pattern may put the kick and hi-hat in a place that is awkward on a real kit.
Dynamics beyond a basic accent are not generated; ghost notes are a large part of what makes a groove feel alive and are not represented.
A generated pattern is a starting point. It has no sense of the song it belongs to, which is what should actually decide the part.

Common mistakes

Playing the grid without counting: Count the subdivision out loud while you play. A step grid is a map of where things fall in the count, and losing the count loses the pattern.
Playing every hit at the same volume: A pattern played flat sounds like a machine. The kick and snare carry the accent, and the hi-hat sits underneath.
Assuming a 4/4 grid works in 6/8: It does not — the number of steps and how they group are both different. Generate in the signature you are actually playing.

Practical tips

Play each row on its own first, then combine two, then all three. Independence is built one limb at a time.
Program the pattern into a sequencer at half speed and raise the tempo once it is even.
Generate two bars and treat the second as a variation rather than a repeat — that is how real parts avoid sounding looped.

Privacy and your data

Nothing is entered and nothing is stored. The pattern is generated in your browser, is not uploaded and is not written into the page address. Analytics records the time signature and difficulty, never a pattern.

Frequently asked questions

How do I read a step grid?: Each column is one step in time, moving left to right. Each row is one drum. A mark means that drum is hit on that step. Reading down a column tells you everything that happens at that instant.
How many steps are in a bar?: It depends on the time signature. 4/4 divided into sixteenth notes gives sixteen steps; 6/8 gives twelve; 7/8 gives fourteen. Assuming sixteen is the mistake most pattern grids make.
Can I use these patterns in music I release?: Yes. A drum pattern is a rhythm, and short rhythmic patterns are not protected by copyright. Nothing generated here carries any restriction from us.
Why is the hi-hat not randomised?: Because a randomly placed hi-hat reads as a mistake rather than a choice. Its job in most patterns is to state the subdivision steadily, so the tool keeps it regular and randomises the parts where variation actually sounds like a groove.