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Audio Joiner

Put a recording that stopped and restarted back into one file. Add the parts, set the order, choose a straight join, a short gap or a crossfade, and save one MP3 or WAV. Free, no account, and the files are not uploaded.

Drop two or more audio files here or click to browse

2 to 20 files: MP3, M4A, AAC, WAV, OGG, OPUS, FLAC, WEBM or MP4, each up to 100 MB and 30 minutes, 60 minutes in total.

The files are processed in your browser and are not uploaded.

How to merge audio files

Three steps, and the total length shows before you save.

  1. 1

    Add the files

    Drop 2 to 20 audio files, or click to pick several at once. MP3, M4A, WAV and other formats can be mixed. Each file is read straight away, so a file your browser cannot open is flagged before you start.

  2. 2

    Put them in order

    Files join from top to bottom. Use the up and down arrows next to each file to move it (they work with the keyboard too), and the cross to take one out. Add more files at any time.

  3. 3

    Choose the join, then save

    Pick a straight join, a gap of silence or a crossfade, check the total length and size, choose MP3 or WAV and save. The joined file plays on the page before you download it.

Need to cut a part out first? Use the Audio Trimmer, then join the result here.

When a recording comes in parts

Most joins fix a recording that did not run in one go.

  • An interview in two parts

    The phone rang, the battery ran low or the app stopped at a time limit. Join the parts in order with a straight join and the conversation reads as one file again.

  • A meeting split by a call

    Someone paused the recording for a private call and started a new one. Join the before and after, with a one-second gap so the break stays audible.

  • Voice memo parts

    Notes recorded in several short memos after a site visit or a customer call become one file to send or to transcribe.

  • An intro and an outro

    Put a short intro before a podcast episode or a training recording, with a crossfade so the music runs into the voice.

Straight join, gap or crossfade

  • Straight join for one conversation

    Each file starts the moment the previous one ends. Best when the parts are one recording that was cut, such as an interview in two files.

  • A gap to mark a break

    Half a second to five seconds of silence between files. Use it when the parts are separate takes or when you want listeners to hear the break.

  • A crossfade for music and intros

    The end of one file fades out while the next fades in, over half a second to five seconds. Each crossfade is capped at half the shorter file, and it shortens the total by its length.

Mixed formats and sample rates

Files can differ: an M4A from an iPhone at 48 kHz and an MP3 at 44.1 kHz join fine. The joiner converts every file to one sample rate (44.1 kHz or 48 kHz; the default is the rate your browser decodes audio at) and one channel layout (stereo when any file is stereo, or mono if you choose it), then joins them.

Converting does not add quality. A file recorded at 16 kHz still sounds like 16 kHz after the join, and saving the result as an MP3 is a new lossy encode. For speech, mono at 128 kbps is plenty and keeps the file small.

Limits: 20 files, each up to 100 MB and 30 minutes, and 60 minutes in total, because every file is decoded on your device. Safari opens OGG and Opus files only from version 18.4; every other listed format opened in Chrome when we tested the page.

Sources

More on recording meetings and interviews: How to record a meeting on iPhone, How to transcribe an interview, Best interview recording app.

One recording, one transcript

Stitching a split recording back together is the job you do by hand. ParrotNotes records the whole conversation on your phone and gives you the transcript and a summary, free for 100 minutes a month.

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Related tools

Audio joiner FAQ