How do I join MP3 files online for free?

Drop your MP3 files onto the audio joiner above, drag to reorder them, optionally set a silence gap or crossfade between tracks, choose MP3 as the output format and click Join. The combined MP3 downloads automatically. There is no signup and nothing is uploaded — FFmpeg runs in your browser.

How do I combine multiple audio files into one?

Add up to 10 audio files (MP3, WAV, M4A, OGG, FLAC, AAC or WEBM in any combination), reorder them by dragging, and click Join. FFmpeg normalises them to a common sample rate and concatenates them into a single file in MP3, WAV or OGG.

How do I join MP3 files without losing quality?

Choose WAV as the output format to keep the join lossless, or set the MP3 output to a high bitrate (320 kbps) to minimise re-encoding loss. Avoid crossfade if you need a bit-exact concatenation — crossfade fades the audio at the boundary by definition.

What audio formats can I join — MP3, WAV, M4A, OGG?

All of those, plus FLAC, AAC and WEBM. You can mix formats freely in a single join — for example, three MP3s plus a WAV — and FFmpeg normalises them before concatenation. The joined output can be MP3, WAV or OGG.

How many files can I join?

Up to 10 audio files per join operation.

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 joined 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.

Is an audio joiner the same as an audio merger?

Yes — 'audio joiner', 'audio merger', and 'audio combiner' all describe the same operation: stitching multiple audio files end-to-end into one track. Different sites and search terms use different names, but the underlying workflow is identical.

Audio Joiner

Free online audio joiner — combine MP3, WAV, M4A, OGG and FLAC files into one track. Reorder, crossfade, and adjust volume, all in your browser.

Last updated: May 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 joining.

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 joined result as MP3, WAV, or OGG.

How to use Audio Joiner

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 join 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 joining.
5
Choose output format and join
Select MP3, WAV, or OGG, then click Join. FFmpeg joins the tracks in your browser and the file downloads automatically.

When to use this

Joining songs into a single MP3

Combine multiple song MP3s into one continuous track with crossfade between them — no DAW required.

Combining podcast clips into an episode

Join intro jingle, interview recording and outro music into a single MP3 ready to upload.

Joining lecture recordings or voice notes

Merge several voice memos or split lecture recordings into one audio file with brief silence gaps.

Building a sound-effects compilation

Concatenate short SFX clips into a single WAV with controlled gaps for review and tagging.

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 join
Max file size	200 MB per file
Processing location	Entirely in your browser — nothing is uploaded

Audio joiner, MP3 merger, sound combiner — different names, same job

An audio joiner, audio merger, and audio combiner all do the same thing: stitch multiple audio files end-to-end into a single track. You'll see this tool called an MP3 joiner, MP3 merger, MP3 combiner, song joiner, song merger, sound merger, or audio concatenator across the web — and depending on what you searched for, you might know it as 'merge MP3 files online', 'combine audio files', or 'join audio together'. The terminology varies; the workflow doesn't. Drop your files, reorder, optionally crossfade or add silence gaps, and download the joined track.

Under the hood this is FFmpeg's concat operation running in WebAssembly, so it works for MP3, WAV, M4A, OGG, FLAC, AAC, and WEBM regardless of which name you came here looking for. Nothing uploads to a server — the join happens entirely in your browser.

Frequently Asked Questions

How do I join MP3 files online for free?: Drop your MP3 files onto the audio joiner above, drag to reorder them, optionally set a silence gap or crossfade between tracks, choose MP3 as the output format and click Join. The combined MP3 downloads automatically. There is no signup and nothing is uploaded — FFmpeg runs in your browser.
How do I combine multiple audio files into one?: Add up to 10 audio files (MP3, WAV, M4A, OGG, FLAC, AAC or WEBM in any combination), reorder them by dragging, and click Join. FFmpeg normalises them to a common sample rate and concatenates them into a single file in MP3, WAV or OGG.
How do I join MP3 files without losing quality?: Choose WAV as the output format to keep the join lossless, or set the MP3 output to a high bitrate (320 kbps) to minimise re-encoding loss. Avoid crossfade if you need a bit-exact concatenation — crossfade fades the audio at the boundary by definition.
What audio formats can I join — MP3, WAV, M4A, OGG?: All of those, plus FLAC, AAC and WEBM. You can mix formats freely in a single join — for example, three MP3s plus a WAV — and FFmpeg normalises them before concatenation. The joined output can be MP3, WAV or OGG.
How many files can I join?: Up to 10 audio files per join operation.
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 joined 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.
Is an audio joiner the same as an audio merger?: Yes — 'audio joiner', 'audio merger', and 'audio combiner' all describe the same operation: stitching multiple audio files end-to-end into one track. Different sites and search terms use different names, but the underlying workflow is identical.

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