BitBox is a tool for sketching and sharing chiptune melodies.
All song data is packaged into the URL at the top of your browser. When you make changes to the song, the URL is updated to reflect your changes. When you are satisfied with your song, just copy and paste the URL to save and share your song!
You can add or remove notes by clicking on the gray rows at the top. BitBox automatically plays the notes out loud for you. Try it!
Notes go into patterns, and you can edit one pattern at a time. Those numbered boxes at the bottom of the editor are the different patterns you can edit. Click the other boxes to move to a different part of the song, or click the arrows on the currently selected box to swap which pattern is played during that part of the song.
There are four rows of patterns that BitBox can play simultaneously, and each row has its own set of patterns. The first three rows can play melodies and the bottom row is for drums. You can also edit these to have up to eight rows of patterns (eight melodies max and four drums max), and increase the beats per bar (32 max), bars per song (256 max) patterns per channel (128 max), and add different instruments to have different chiptune notes (128 max). Multiples of 3 or 4 beats per bars and bars per song are recommended.
The purple loop underneath the numbered boxes controls which part of the song is currently repeating. Move the loop to listen to a different part of the song, or drag the ends to expand the loop to include the whole song.
When BitBox has focus (click on its interface above), you can use these keyboard shortcuts:
In the pattern editor, you can click and drag horizontally on a note to adjust its duration. You can also click above or below an existing note to enable a rapid arpeggio/trill effect, oscillating between two or more simultaneous notes.
ADVANCED: Drag vertically from an existing note to bend its pitch, or drag vertically from above or below the note to adjust its volume.
BitBox has many more features. Try playing with the buttons and menus on the right side to find out what it can do!
BitBox is a fork of Beepbox, which was originally developed by John Nesky. It was forked by ZM79-eng on January 7, 2025 from an offline copy of 2.2.2 originally created on February 6, 2018 and is geared towards those who miss the pre-FM era of BeepBox while also adding improvements. BitBox allows you to create 8-Bit music. It was released on github on October 17, 2025 and the site went live on January 27, 2026.
The project's YouTube Channel can be found here.
The project's source code can be downloaded here. BeepBox's original source code can be downloaded here.
Videos of the project can be found in this table archive here.
BitBox does not claim ownership over songs created with it, so original songs belong to their authors.
Neither ZM79-eng nor BitBox assume responsibility for any copyrighted material played on BitBox. No songs are ever received, recorded, or distributed by BitBox's servers. All song data is contained in the URL after the hash (#) mark, and BitBox running inside your browser converts that data into sound waves.