Merge Audio Files Into One

Stitching recordings together is usually a job for a full editor, or for a website that wants your files on its server first. This does it in the browser: drop in a batch, put them in the order you want, and get back one continuous file. If the total would be unwieldy, set a maximum length and the batch is split across several outputs instead — files are packed in order until the next one would overrun, so a four-hour batch becomes eight half-hour files with a shorter one at the end. Useful for joining chapters into an audiobook, assembling a DJ set or a lecture series, and turning a folder of voice memos into something you can listen to in one sitting.

How to Merge Audio Files Into One

  1. 1

    Add your files

    Drop in as many as you like. WAV, MP3, M4A, OGG and FLAC can be mixed freely in one batch — they do not need to share a sample rate or channel count.

  2. 2

    Put them in order

    Files play in the order shown. Move any file up or down, or press Sort by name — that sorts numerically, so track2 lands before track10 rather than after it.

  3. 3

    Set the length and the gap

    Choose how long an output runs before a new one starts, and how many milliseconds of silence to insert between files. Each row shows which output file it will end up in, updating as you type.

  4. 4

    Pick the output format

    WAV keeps the result uncompressed and lossless; MP3 makes it far smaller, which matters when each output runs half an hour. The estimated size updates as you choose.

  5. 5

    Merge and download

    Press Merge, then download each finished file or grab them all at once.

How it works

This is signal processing, not a model. Each file is decoded to raw samples, then scheduled onto an offline audio graph at its computed start time and rendered in one pass through the Web Audio API. Routing the files through that graph rather than copying samples by hand is what lets a mixed batch work: sources are resampled to a common rate and up- or down-mixed to a common channel count on the way through, so 44.1 kHz stereo and 48 kHz mono files merge without you having to convert anything first. Mono files in a batch that also contains stereo come out stereo. The output sample rate is whatever your browser decodes at, which is your sound hardware's rate — normally 44.1 or 48 kHz. Gaps between files are exactly that: silence of the length you asked for, to the sample.

Supported formats

WAV, MP3, M4A, AAC, OGG and FLAC. Files are decoded by your browser, so anything it can play will work here. Output is exported as WAV.

Frequently asked questions

Is my audio uploaded anywhere?
No. Everything runs inside your browser using the Web Audio API, so the file never leaves your device. You can prove it: load the page, turn off your Wi-Fi, and the tool still works.
Can I merge files with different formats or sample rates?
Yes. Mix MP3, WAV, M4A, OGG and FLAC in one batch, at any sample rate or channel count — they are converted to a common format as they are merged, so you do not need to convert anything first. If any file in the batch is stereo, the output is stereo and mono files are up-mixed to match. The output sample rate is the one your browser decodes at, which is your sound hardware's rate, normally 44.1 or 48 kHz.
What happens to a file longer than the length I set?
It gets an output to itself and runs over the limit. Files are never cut in half — the length setting decides where one output ends and the next begins, and splitting a recording down the middle is a different job. The tool flags any file this applies to before you start.
How do I control the order?
Files merge top to bottom in the list. Use the arrows to move any file, or Sort by name for a numeric sort that handles numbered filenames correctly.
Can I get the result as an MP3?
Yes. Choose MP3 as the output format and pick a bitrate. It makes a large difference here: 30 minutes of uncompressed WAV is around 300 MB, while the same audio at 192 kbps is closer to 43 MB. WAV is the default because merging is otherwise lossless, but MP3 is usually the practical choice for long outputs. The estimated size is shown before you press Merge.
Does this use AI?
No. Joining audio end to end is exact arithmetic on samples — traditional DSP does it perfectly, and a model could only make it worse. Audio Magic uses AI where rules genuinely fall short: Whisper for transcription and translation, and RNNoise or DeepFilterNet3 for pulling a voice out of background noise.
Do I need an account?
No. The free tools work straight away with no sign-up. Creating a free account raises your daily processing limit from 20 to 60 minutes.
Is it free?
Yes. Every tool on this page is free to use, with a daily limit on total audio processed. There is no watermark and no trial period.

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