🎙️ Audio and video

Audio joiner (merge audio files)

Add audio files, put them in order and join them into one MP3 or WAV. It runs in your browser and nothing is uploaded.

Free · no signup Runs in your browser

Drop audio files hereor click to choose. Nothing is uploaded.
Your filesAdd two or more audio files

    How do I join audio files into one?

    Add the files, put them in the order you want with the arrows, choose a gap of silence between them if you like, pick MP3 or WAV and press Join. The files are decoded in your browser, laid end to end and saved as one file. Files with different sample rates are converted to match the first one, and nothing is uploaded.

    Putting recordings together

    Joining audio is the job of stitching voice memos into one recording, an intro onto an interview, tracks into a mix or a few short clips into a ringtone. A full editor can do it, but a joiner does the single thing you need in a few clicks.

    The tool decodes each file with your browser, so it joins whatever your browser can play: MP3, WAV, M4A, OGG and the sound of video files. They are placed one after another in the order shown, with an optional gap of silence between them. Files are matched to the sample rate of the first one so that nothing plays at the wrong speed, and mono files are copied to both sides if any file is stereo. The result is saved as MP3, which is small, or WAV, which loses nothing.

    It runs in your browser. Your files are never uploaded, and there is no watermark or sign-up. MP3 encoding uses LAME (lame.sourceforge.io), an open-source encoder, licensed under the LGPL.

    When to use it

    • Joining voice memos or interview parts into one recording
    • Adding an intro or an outro to a recording
    • Making one file from several short sounds
    • Combining tracks for a simple mix or a playlist file

    Mistakes it helps you avoid

    • Joining in the wrong order: check the list before you press Join.
    • Saving to MP3 repeatedly: each save loses a little quality, so keep your originals.
    • Expecting a smooth blend: the files are joined end to end with no crossfade.
    • Joining very long files on a phone, which holds all the sound in memory.

    How it works

    Your audio is decoded, changed and saved inside your browser.

    • 1. Each file is read on your device and decoded to samples by your browser.
    • 2. The files are placed one after another in the order shown, with the gap you set; other sample rates are converted to the first file's rate.
    • 3. The joined sound is written as WAV by hand or encoded as MP3 with LAME. Nothing is uploaded.

    Total length = sum of the lengths + gaps. Joined WAV size is the sample rate × 2 bytes × channels × seconds, about 10.6 MB a minute for CD quality stereo; MP3 at 192 kbit/s is about 1.4 MB a minute. There is no crossfade between files.

    Example: an intro and an interview

    You join a 10-second intro, a 12-minute interview and a 10-second outro with no gap.

    1. Length10 + 720 + 10 = 740 s, 12:20
    2. MP3 at 192 kbit/s192 ÷ 8 × 740 = 17,760 KB, about 17 MB

    One 12:20 MP3 of about 17 MB

    Choose WAV for no loss, but about seven times bigger.

    Terms on this page

    Sample rate
    How many samples of sound are stored each second.
    Crossfade
    A smooth blend from the end of one clip into the start of the next.

    Common questions

    Can I change the order of the files?

    Yes. Use the arrows next to each file before you press Join.

    Can I add silence between the files?

    Yes. Enter a gap in seconds.

    Why do I hear a click between files?

    The files are joined end to end with no crossfade. A click can come from a sound that was cut off abruptly in the file.

    Is my audio uploaded?

    No. Your browser reads and changes the sound on your own device. Nothing is sent over the network.

    What formats can I join?

    Any your browser can play, such as MP3, WAV, M4A, OGG and the sound of videos. The result is MP3 or WAV.

    What to work out next

    Where these numbers come from

    Last verified 2026-10-25 The method on this page is checked against the sources above at least once a year. Spotted something out of date? Tell us and we will fix it.

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