Audio Joiner & MP3 Merger

Combine multiple audio tracks and voice clips into one continuous MP3 file. Arrange track order, apply seamless crossfades, and add ID3 album tags directly on your computer.

Multi-Track Queue Crossfade Blending ID3 Tag Editor → Continuous MP3
Audio Engine Web Audio Resampler
MP3 Encoder LameJS (LGPL-3.0)
Output Quality Up to 320 kbps CBR
Privacy 100% In-Browser Execution
• merged runtime

Add audio files to merge

Select multiple files at once (MP3, WAV, M4A, FLAC, OGG, AAC)

Browse Audio Files

Track Queue & Sequence

Tracks will be merged in this exact order

Merge Configuration

Transition curves and output options

Crossfades blend overlapping track edges smoothly.

Client-Side Processing Guarantee

All audio concatenation, resample alignment, and crossfade synthesis are computed directly in your browser using the HTML5 Web Audio API and LameJS 1.2.1 (LGPL-3.0). Zero server uploads.

Concatenation Engine: W3C Web Audio API
MP3 Encoder: LameJS 1.2.1 (LGPL-3.0)
Data Privacy: 100% On-Device

How to Combine Audio Files into One MP3

Whether you are creating a seamless DJ playlist, stitching voice notes, or making continuous podcast episodes, our in-browser audio joiner allows you to sequence tracks with precision crossfading.

1

Upload Multiple Tracks

Drop two or more audio tracks into the queue from any format.

2

Arrange & Crossfade

Reorder the track list and set your desired crossfade overlap seconds.

3

Download Unified MP3

Download your complete continuous track at 320 kbps with ID3 tags.