LED Matrix Editor

Design pixel patterns and animations for 8x8 / 16x16 LED matrices, MAX7219 strips and NeoPixel grids. Multi-frame, undo/redo, drawing tools, transforms, and Arduino / Python / MicroPython / JSON export. Click and drag the grid; everything runs in your browser.

Click a sample, then hit Play.

Frame 1 / 1

0 lit

Native

FPS4 fps

250 ms total

Frames

Click a thumbnail to switch frames. Drag to reorder. Double-click a thumbnail to set its delay.

Export

Import

Auto-detects JSON workspace vs raw bytes.

Shortcuts: P pencil · E eraser · F fill · L line · R rect · I invert · X clear · arrow keys shift the active frame · Cmd/Ctrl+Z undo / Cmd/Ctrl+Shift+Z redo. Pencil click toggles a cell, then drag paints with that resulting value. Bytes export uses bit 7 as column 0 (the convention used by LedControl, FastLED and the xantorohara editor).