Audio Merger

Sequential plays files one after another. Overlay mixes all files simultaneously, like combining multiple tracks.

Between 2 and 8 audio files per session.

No quality loss in sequential mode. Overlay mode mixes waveforms which can cause clipping if not normalized — use the normalize option.

Yes, the Audio Merger is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Audio Merger processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Audio Merger is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Audio Merger in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Audio Merger works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

You can add the common formats that browsers decode natively: MP3, WAV, OGG, and M4A. You can even mix formats in one session — for example, drop in an MP3 voiceover and a WAV music bed together, and they merge into a single track. The output is always an uncompressed 16-bit PCM WAV file named merged_audio.wav, regardless of what you put in. WAV is lossless and plays everywhere, but it is larger than MP3 — expect roughly 10 MB per minute of CD-quality stereo audio. If a file uses a codec the browser can't decode, it is skipped with a notice rather than failing the whole batch. Add at least two files, pick your mode, and download the merged WAV straight to your device.

It depends on the mode, and the tool shows the result live before you merge. In sequential mode, clips play back to back, so the output length is the sum of every clip's duration — three two-minute files become one six-minute file. In overlay mode, all clips start at zero and play at the same time, so the output length equals your single longest clip; shorter clips simply finish early while the longest keeps going. The file list displays each clip's individual duration, and a badge shows the running total for sequential or the longest-track length for overlay. This makes it easy to confirm the math before downloading. Add your files, switch between the two modes to preview each length, then merge once it matches what you expect.

Normalize applies peak normalization. After mixing, it scans the merged audio for the single loudest sample, then scales the entire signal up so that peak sits just below the maximum level without distorting. It does not compress or change dynamics — it simply raises overall loudness uniformly. This matters most in overlay mode, where summing several waveforms together can push the combined signal past the ceiling and cause clipping; normalization is the simplest safeguard against that. It also helps even out clips recorded at different volumes so one isn't much quieter than another. Leave it off when your levels are already balanced and you want the original loudness preserved exactly. Turn the switch on before merging if you've layered tracks or combined recordings from different sources, then download the cleaner result.

Yes. The merged output uses as many channels as your widest file, so if any clip in the set is stereo, the final WAV is stereo too; a mono clip placed alongside it is simply played through the available channels. The sample rate of the result is taken from your first clip in the list, and every other file is rendered into that same context. Because order can affect the output sample rate, drag your files into the sequence you want before merging — the clip in position one sets the rate. This keeps everything consistent in a single render rather than re-encoding clips separately. Arrange your files, confirm the first one has the sample rate you prefer, then merge and download the combined track in one step.

All decoding and mixing happen in memory using your browser's Web Audio API — nothing is uploaded or streamed to a server. To merge, the tool decodes every file into raw audio samples, renders them together through an offline audio context, and encodes the result as WAV, all held in RAM at once. Long files or many high-quality clips therefore use a meaningful amount of memory, which can slow things down on lower-spec devices or mobile. Because the result is uncompressed WAV, the output itself is also sizable — around 10 MB per minute of stereo audio. Trimming clips beforehand keeps the process fast and light. If you need a smaller final file, run the downloaded WAV through an audio converter afterward. Add two to eight files and merge whenever you're ready.