Join audio files into one

A lecture that arrived in four voice memos, an interview split by a phone call, chapters of an audiobook rip — the fix is one file with the parts in the right order. Drop them here, drag them into order, and they come back as a single MP3 or WAV. Decoding and encoding run in your browser with the same audio pipeline as every converter on this site — your files are never uploaded.

  1. Your recordings

    Drop your recordings here

    MP3WAVM4AFLAC

    Your files are never uploaded.

  2. The order

  3. One file

How to join audio files

  1. Drop your recordings

    MP3, WAV, M4A, FLAC, OGG, Opus, AAC or AIFF — mixed freely in one list. Add stragglers later; they join the end.

  2. Drag them into order

    The list is the timeline: whatever is first plays first. The grip on each row drags, on phones too.

  3. Join and save

    One file comes back — MP3 at 320 kbps for players, or uncompressed WAV for editing — with a player so you can check the seams before saving.

What you get

Seams that are cuts, not fades

Parts are joined sample-exact: the first sample of part two follows the last sample of part one, nothing overlapped and nothing faded. A lecture in three parts comes back as one lecture — crossfading between songs is a DJ tool's job, and pretending otherwise would smear speech.

Mixed formats, one list

Every format the converters on this site read goes in the same queue — a WAV between two voice memos is fine. Everything is decoded to a common 44.1 kHz before the join, so mismatched sources cannot corrupt the seams.

Stereo survives, mono is centred

If any part is stereo the result is stereo, and mono parts sit identically in both channels. Your music keeps its sides; your voice memo does not force them away.

Joined where the files already are

Hours of audio decode to a lot of data, and all of it stays in this page's memory — your files are never uploaded, no matter how long the parts run.

Questions about joining audio

Can it crossfade between the parts?
No, and that is deliberate: this tool makes one continuous recording out of pieces, so the seams are exact cuts. A crossfade blends two seconds of both parts — right for a playlist, wrong for a lecture cut mid-sentence.
The parts have different sample rates and channels. Does that matter?
No. Everything is decoded to 44.1 kHz first — the browser's own resampler does the conversion — and channel layout is unified: stereo anywhere makes the output stereo, with mono parts centred.
MP3 or WAV — which should I pick?
MP3 at 320 kbps if the result is for listening: it opens everywhere and stays a reasonable size. WAV if you are editing afterwards — it is uncompressed, several times larger, and adds no second loss on top of lossy sources.
How much audio can I join?
Up to about three hours of output, the same cap as the converters here — decoded audio is big, and that is roughly where a browser tab's memory budget ends.
Is it free, and are my recordings uploaded?
Free, no account, no watermark. Decode, join and encode all run in your browser — your files are never uploaded.

One file in the wrong format? The audio converters read the same formats. Wrong speed once joined? Change speed & pitch. Or see all the audio tools.