What is Audio Merger?

Audio Merger lets you combine multiple audio files into a single track. Upload WAV, MP3, or OGG files, arrange them in your preferred order, and merge them into one continuous audio file ready for download.

The merger accepts MP3, WAV, OGG, FLAC, AAC, M4A, and WebM in any combination. Tracks decode in the audio engine and join at 44.1 kHz with optional per-track volume (50%–150%), an equal-power crossfade up to 5 seconds, or a silence gap up to 3 seconds between tracks. Trim a start and end point on any track to cut an intro or outro before joining, and switch on Match volume to level every clip to the same loudness. You can also fade the whole mix in and out. Download the finished file as WAV, MP3 (128/192/320 kbps), FLAC, or OGG.

How to use

1. Upload two or more audio files by dragging them or clicking the upload area
2. Reorder the tracks by dragging them into your desired sequence
3. Click Merge and download the combined audio file

When to use

• Stitching a recorded intro, a remote interview, and a sign-off into one podcast episode.
• Joining short voice memos from a long meeting into one continuous recording.
• Combining individual chapter recordings of an audiobook into a single file for upload.

Result

A podcaster merges an intro jingle, the main interview recording, and an outro track into a single episode file for distribution.

FAQ

Will there be a click or pop between joined tracks?

Only if you join with a hard cut and the source samples don't meet at zero. Turn on Crossfade in the transition options to blend each pair smoothly with an equal-power curve, or add a short silence gap so the transitions land in silence. With None selected, samples concatenate directly, so any pop already in the source files carries through.

What happens when I mix files with different sample rates?

The Web Audio API upsamples everything to the highest sample rate found among your inputs, so a 22.05 kHz file in a 48 kHz batch gets resampled to 48 kHz. The result is one consistent rate. Audible artefacts only appear with very low source rates like 8 kHz phone calls.

Which formats can I download the merged file in?

Pick WAV, MP3, FLAC, or OGG right above the download button. WAV stays lossless, MP3 lets you choose 128, 192, or 320 kbps for smaller files, FLAC keeps full quality compressed, and OGG suits the web. Every format is encoded on your device, so nothing is ever uploaded.

How many tracks can I merge in one go?

There's no hard limit, but device memory typically caps out around 30 to 50 podcast-length tracks before the page slows down or crashes. For a full season, merge in batches of 20, then merge the batches.

Does merging preserve stereo and surround channels?

Stereo is preserved exactly. If you mix mono and stereo files, all tracks render as stereo with the mono signal duplicated to both channels. Surround formats like 5.1 are downmixed to stereo because the Web Audio API does not output multichannel WAV.

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