Audio Joiner
Join MP3 & WAV Files
Arrange your tracks. Preview every transition.
Combine multiple audio files into one.Add gaps, crossfades, and loudness matching.Generate YouTube timestamps along with your audio.
Drop the audio files you want to join
or choose multiple files (up to 50)
MP3, WAV, M4A, AAC, OGG, FLAC, AIFF / Added in selection order
Analyzing duration, loudness, and silence. Decoded audio is not retained between files.
On a computer, drag rows to reorder tracks. Track names are used for timestamps; your original file names stay the same.
Transitions
0–10 seconds, in 0.1-second steps. Crossfades overlap adjacent tracks, so gaps are disabled while crossfading.
Advanced: Loudness, Silence & Output
Adjusts each track to the selected loudness. If that would cause clipping, gain is limited to keep peaks at or below -1 dBFS.
Briefly reduces loud peaks before applying gain to help quiet tracks reach the target (-1 dBFS peak ceiling, up to +24 dB gain). Heavy limiting can reduce dynamics and soften transients.
Treats audio below -50 dBFS as silence, keeping 0.05 second before and after the sound.
Files with different sample rates are converted without changing pitch or speed. Mono files become stereo with identical left and right channels.
Joined Audio Preview
Add at least two tracks to preview the full sequence and transitions
Transitions are enlarged; the middle of each track (≈) is compressed. Drag a purple handle left for a crossfade or right for a gap. Arrow keys adjust 0.1 second; Shift + arrow adjusts 1 second. Changes apply to all transitions.
Your joined audio is ready
How to merge audio files online
- Choose the tracks you want to combine. They are added in selection order.
- Drag rows to reorder tracks, or use the up and down buttons. Rename tracks for your chapter timestamps.
- Choose a gap or crossfade, then preview the transitions. The purple handle adjusts all joins together.
- Click Merge Audio and download the combined MP3 or WAV. Copy timestamps if you need a YouTube track list.
Make a continuous mix or medley
Use a crossfade to overlap the end of one track with the start of the next. A 2–5 second overlap is a useful starting point for a background-music mix; listen for overlapping vocals or clashing beats. Crossfades shorten the total duration because adjacent tracks overlap.
For tracks that should stay separate, use a silent gap instead. Audio files are joined sequentially; this tool does not layer multiple full-length tracks together.
Combine podcast segments and voice recordings
Put your intro, spoken segments, and outro in order. Use little or no crossfade to keep speech clear. Loudness matching can reduce distracting changes between recordings. Track names are used for timestamps without changing the original files.
Match loudness between tracks
Enable Match Loudness to target -8, -10, or -14 LUFS. Peaks are kept at or below -1 dBFS, so a quiet recording may fall short of the loudness target. The optional limiter reduces peaks before applying gain and can help reach the target, at the cost of some dynamics. Check the finished file with the LUFS Loudness Meter.
Join selected parts of songs
To make a chorus medley, trim each section first with the Audio Cutter. For precise fades on individual clips, use the Audio Fade Editor.
Frequently Asked Questions
Can I merge MP3 and WAV files together?
Yes. You can mix supported input formats, including MP3, WAV, and M4A. Tracks are decoded and converted to the selected sample rate before joining.
Can I add a crossfade between songs?
Yes. Set a crossfade from 0 to 10 seconds in 0.1-second steps. Adjacent tracks overlap, so silent gaps are disabled while crossfading.
What are the file and duration limits?
You can add up to 50 tracks. WAV output is limited to 60 minutes total. Other loading and export limits depend on device memory and the notices shown by the tool.
Can I download M4A?
This tool exports MP3 or WAV. M4A files can be used as input. To create M4A output, convert the joined file with the Audio Converter.
Does this combine audio without re-encoding?
No. Audio is decoded for transitions and loudness processing, then encoded as MP3 or WAV. Use WAV to avoid another lossy encoding step.
Are my audio files uploaded?
No. Audio analysis and joining happen in your browser. Your source files stay on your device.