Multi-Track Audio Editor — Layer Tracks into One Mix, Online Free
Stack up to 8 files, balance each one, and export a single mix.
Drop two or more audio files to stack them
MP3, WAV, M4A, OGG, FLAC, and more
Processed locally — your files never leave this tab
Put a vocal on a beat, or a voiceover on music, and hear them together. Each file is its own track: level, pan, mute, solo, and where it starts. The mix is summed in your browser. Nothing is uploaded, and closing the tab ends the session.
Mixes this page is for
- Lay a voice memo under a music bed and slide it so the voice starts after the intro.
- Balance a few stems you already have — a vocal, drums, a guitar — and export one file.
- Solo one part to check it, then bring the others back, without installing a DAW.
How to use the Multi-Track Audio Editor
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Add the files
Drop two or more audio files, or click to choose them. Each file becomes one track. This page stops at 8.
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Place and balance
Drag a clip to set when it starts. Drag either edge to trim. Set level and pan on the row, or type the start and trim times. Mute and Solo are on the same row.
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Play, then export
Press Play mix and listen. Export MP3 or WAV. If the sum would clip, every sample is turned down by the same amount and the page says how many dB.
A small mixer, not a DAW
Each file is one clip on its own track. You set level, pan, mute, solo, and where that clip starts. Up to eight tracks play together and export as one file.
One clip per track. No MIDI, no instruments, no volume curve, and no automatic ducking of music under speech. Plugins and a project you reopen tomorrow belong in Audacity or a browser DAW.
What to use it for
It fits short stacks you would otherwise bounce in a larger program:
- A voice track over a music bed, with the voice louder.
- Two takes lined up by start time, one soloed while you compare.
- A stereo image nudged with pan, then one export.
The session ends with the tab
Nothing is uploaded, and there is no project file. If you close the tab before export, the mix is gone.
Files that should play one after another, not on top of each other, belong on the audio joiner. That page crossfades neighbours. This one stacks them.
Multi-Track Audio Editor FAQ
Does my audio get uploaded?
No. The browser decodes each file with decodeAudioData and adds the samples together in memory. After the page has loaded, the export does not need a server. Closing the tab throws the session away — there is no account and no saved project.
What happens to the sound?
Tracks are resampled to the highest sample rate among them, and at least 44.1 kHz, with linear interpolation. WAV export is 16-bit PCM of that stereo mix. MP3 export encodes once, at the bitrate you pick, up to 320 kbps. If the sum peaks above 0.98, the whole mix is scaled so the peak lands at 0.98. That is one gain change, not a compressor and not a second encode.
What can this not do?
It does not record MIDI, load instruments or samples, draw a volume curve, or duck music under speech by itself. One clip per track, eight tracks, and no project file. Plugins, automation, and a session you reopen tomorrow belong in Audacity or a browser DAW such as BandLab.
How is this different from the audio joiner?
The audio joiner places files end to end, so one finishes before the next starts, with an optional crossfade at the join. This page plays them at the same time. A playlist in one file is the joiner. A vocal on a beat is this page.
Does it work on a phone?
Yes. The timeline scrolls sideways. Level, pan, start, and trim are sliders and number fields, so you do not need a precise drag. Current Chrome, Edge, Firefox, and Safari decode the usual formats. A file the browser cannot decode is skipped and the others stay.
Why only 8 tracks?
Each track is decoded into memory before you press play. Eight stereo files is already a lot for a phone tab. A 16-track production with plugins is a different tool.
Related tools
Audio Joiner
Merge songs and audio files into one track — in any order, in seconds.
Open Audio Joiner
Voice Recorder
Record your microphone, trim the take, save it as MP3 — nothing leaves your device.
Audio Fade In / Fade Out
Smooth edges in seconds: set both fade lengths to a tenth of a second, preview, export — nothing leaves your device.