Merge Audio

Merge audio online in the order you choose

Put separate recordings into one downloadable track. This audio joiner combines files end to end: the second recording starts after the first, followed by the rest of your list. It is useful for joining spoken sections, collecting short music cues, or assembling a sequence you have already edited. It does not overlay voices, mix background music under speech, or create a multitrack project.

How to join MP3 and WAV files

1. Select two or more MP3 or uncompressed PCM WAV files. You can select several at once or add more after the first selection finishes.
2. Check the numbered list. Use Move up and Move down to set the playback order, or remove a recording you do not need.
3. Preview individual files using their audio controls. Check beginnings, endings and loudness before merging.
4. Choose MP3 and a bitrate, or 16-bit PCM WAV. Review the estimated size, then select Merge audio.
5. Play the joined result, seek to each transition and download the finished file. Keep the originals if you may need to revise the sequence.

What happens when formats differ?

You can combine MP3 and PCM WAV in the same list. Every source is decoded and converted to a common 44.1 kHz stereo format before joining. A mono source is copied to both output channels at the same level; stereo sources keep separate left and right channels. Recordings with another sample rate are resampled. The tool does not preserve each source's original encoding, bit depth or sample rate in separate sections of the output.

MP3 export applies one lossy encoding pass to the assembled audio. Choosing a higher bitrate cannot recover detail missing from an original MP3. WAV export stores 16-bit PCM and may take substantially more space. Neither format promises an unchanged byte-for-byte copy of the inputs. Output metadata is cleared rather than copying one recording's title to the entire sequence.

Listen carefully at each join

No intentional silence or crossfade is inserted between files. Silence already present at the end or beginning of a source remains, and some compressed recordings contain padding. A sharp change in waveform or recording level can produce an abrupt transition or a click. This tool does not automatically align beats, remove silence, match loudness or repair clicks.

Use Trim Audio to remove unwanted sections first. If one recording is noticeably louder, adjust it with Change Audio Volume and compare it at the same player volume. A fade-in or fade-out can soften an individual edge, but two separate fades are not an overlapping crossfade.

Audio merger questions

How many files can I combine?

Choose 2–8 files with a combined input size of at most 30 MiB and a total duration of at most ten minutes. Mono and stereo inputs are supported; surround audio is not. Browser memory can impose a lower practical limit. Try fewer or shorter recordings if processing fails.

Can I merge M4A phone recordings?

This page accepts MP3 and PCM WAV. For audio-only AAC or ALAC recordings, first use M4A to MP3. That additional MP3 conversion is lossy. Keep your original phone recordings and use an editor with native M4A support if avoiding that extra encoding matters.

Will the merged file be smaller?

Its size depends on the combined duration and export settings, not simply the number of input files. The estimate excludes headers and tags; the result shows actual bytes. Use the audio file size calculator to plan an output size and the bitrate guide to choose between storage and quality.

Are my recordings uploaded?

No. Your browser loads the audio engine and processes selected files on your device. Keep this tab open until the merge finishes, then save the download before closing it. The file list and result are not saved as a project for your next visit.

Read the step-by-step audio merging guide or browse all audio tools.