How many files can I merge?

Up to 10 audio files per merge operation.

Can I mix different audio formats?

Yes. You can combine MP3, WAV, M4A, OGG, FLAC, AAC, and WEBM files in any combination. FFmpeg normalises them to a common sample rate before concatenation.

What does crossfade do?

Crossfade overlaps the end of one track with the start of the next, fading the volume between them for a smooth transition instead of an abrupt cut.

Is the total file size limited?

Each individual file can be up to 200 MB. For very large merged outputs, browser memory is the practical limit.

Are my files uploaded to a server?

No. FFmpeg WebAssembly runs entirely in your browser. No audio data leaves your device at any point.

What format should I choose for output?

MP3 is best for compatibility and small file size. WAV is best for lossless quality. OGG is a good open-source alternative to MP3.

Audio Merger

Join multiple MP3, WAV, and OGG files into one audio track — reorder, crossfade, and adjust volume, all in your browser.

Last updated: April 2026

Drag & drop audio files to merge here

or click to browse

MP3WAVM4AOGGFLACAAC·up to 200.0 MB

Audio merging runs entirely in your browser using FFmpeg WebAssembly. Files are never uploaded.

What it does

Up to 10 tracks

Add up to 10 audio files from any combination of MP3, WAV, M4A, OGG, FLAC, AAC, WEBM.

Drag-to-reorder

Rearrange the track order by dragging files up or down in the list before merging.

Silence gaps between tracks

Insert 0–5 seconds of silence between each track for natural pauses.

Crossfade transitions

Blend the end of one track into the start of the next with up to 3 seconds of crossfade.

Per-track volume

Adjust each track's volume from 50% to 150% to balance levels across different recordings.

Choice of output format

Export the merged result as MP3, WAV, or OGG.

How to use Audio Merger

1
Add your audio files
Drop or browse to add up to 10 audio files. Mix formats freely — MP3, WAV, M4A, OGG, FLAC, AAC, WEBM all work.
2
Reorder the tracks
Drag the handle on each file card to rearrange the merge order.
3
Set gap and crossfade options
Choose a silence gap (0–5 s) between tracks and optionally enable crossfade (0–3 s) for smooth blending.
4
Adjust per-track volume
Use the volume slider on each track to balance levels before merging.
5
Choose output format and merge
Select MP3, WAV, or OGG, then click Merge. FFmpeg joins the tracks in your browser and the file downloads automatically.

When to use this

Creating a seamless playlist or mix

Join several song segments with crossfade for a continuous music track.

Assembling a podcast episode

Combine intro jingle, interview recording, and outro music into a single MP3.

Building a sound effects compilation

Join multiple short audio clips with brief silence gaps between each one.

Combining voice recordings

Merge multiple takes of a narration into a single cohesive audio file.

Technical details

Processing engine	FFmpeg 6 via WebAssembly
Input formats	MP3, WAV, M4A, OGG, FLAC, AAC, WEBM
Output formats	MP3, WAV, OGG
Max files	10 per merge
Max file size	200 MB per file
Processing location	Entirely in your browser — nothing is uploaded

Frequently Asked Questions

How many files can I merge?: Up to 10 audio files per merge operation.
Can I mix different audio formats?: Yes. You can combine MP3, WAV, M4A, OGG, FLAC, AAC, and WEBM files in any combination. FFmpeg normalises them to a common sample rate before concatenation.
What does crossfade do?: Crossfade overlaps the end of one track with the start of the next, fading the volume between them for a smooth transition instead of an abrupt cut.
Is the total file size limited?: Each individual file can be up to 200 MB. For very large merged outputs, browser memory is the practical limit.
Are my files uploaded to a server?: No. FFmpeg WebAssembly runs entirely in your browser. No audio data leaves your device at any point.
What format should I choose for output?: MP3 is best for compatibility and small file size. WAV is best for lossless quality. OGG is a good open-source alternative to MP3.