How many files can I merge at once?

There is no hard limit set by the tool. Practical limits are your device RAM and browser memory. A device with 4 GB RAM can typically handle dozens of files totalling several hundred MB of decoded audio.

Can I reorder files before merging?

Yes. After adding files, you can drag them to reorder or click the up/down arrows. The final merged file will follow the order shown in the list.

What happens if the files have different sample rates?

The merged file uses the sample rate of the first file. Files with a different sample rate are resampled to match during decoding by the browser's Web Audio API, so the output is always consistent.

Can I add a pause between clips?

Yes. The Gap field lets you specify silence in milliseconds between each clip. Set to 0 for a seamless join, or add 500–2000 ms for a natural pause.

Is anything uploaded to merge the files?

No. All files are decoded locally using the Web Audio API. The merge operation concatenates AudioBuffers in memory, then encodes the result as WAV — entirely on your device.

What formats can I merge?

Any format your browser can decode: MP3, WAV, OGG, FLAC, AAC/M4A, WebM. You can mix formats — for example, merge an MP3 with a WAV. Output is always WAV (16-bit PCM).

Can I merge a file with itself to loop it?

Yes. Add the same file multiple times. Each instance is decoded independently and concatenated, effectively looping the audio the specified number of times.

What is the maximum output file size?

WAV output is uncompressed. Each minute of stereo 44.1 kHz audio is approximately 10 MB. For very long merged files, consider using the Audio Converter to produce a smaller OGG file afterward.

Audio Merger

Combine multiple audio files into one. Add a configurable gap between clips. Output as WAV — 100% in your browser, no upload.

100% client-side · no upload

Add audio files

Gap between clips (ms):

Add at least 2 audio files to merge.

How to merge audio files

Click Add audio files and select two or more audio files (MP3, WAV, OGG, FLAC, M4A).
The files appear in a list. Drag to reorder if needed.
Set the Gap in milliseconds between clips (0 for seamless, 500+ for a pause).
Click Merge & Download WAV. All files are decoded and concatenated locally.
Preview the result and download the merged WAV.

Common use cases

Podcast assembly: Join intro music, main content, and outro into one file.
Audio book chapters: Combine chapter recordings into a single long-form audio file.
Music production: Assemble multiple recorded takes into a single WAV for import into a DAW.
Playlist creation: Build a continuous background music track from individual songs.
Interview joining: Combine separate interview segments recorded on different devices.

Related tools: Audio Trimmer · Audio Splitter · Audio Fade · Audio Converter

よくある質問

How many files can I merge at once?: There is no hard limit set by the tool. Practical limits are your device RAM and browser memory. A device with 4 GB RAM can typically handle dozens of files totalling several hundred MB of decoded audio.
Can I reorder files before merging?: Yes. After adding files, you can drag them to reorder or click the up/down arrows. The final merged file will follow the order shown in the list.
What happens if the files have different sample rates?: The merged file uses the sample rate of the first file. Files with a different sample rate are resampled to match during decoding by the browser's Web Audio API, so the output is always consistent.
Can I add a pause between clips?: Yes. The Gap field lets you specify silence in milliseconds between each clip. Set to 0 for a seamless join, or add 500–2000 ms for a natural pause.
Is anything uploaded to merge the files?: No. All files are decoded locally using the Web Audio API. The merge operation concatenates AudioBuffers in memory, then encodes the result as WAV — entirely on your device.
What formats can I merge?: Any format your browser can decode: MP3, WAV, OGG, FLAC, AAC/M4A, WebM. You can mix formats — for example, merge an MP3 with a WAV. Output is always WAV (16-bit PCM).
Can I merge a file with itself to loop it?: Yes. Add the same file multiple times. Each instance is decoded independently and concatenated, effectively looping the audio the specified number of times.
What is the maximum output file size?: WAV output is uncompressed. Each minute of stereo 44.1 kHz audio is approximately 10 MB. For very long merged files, consider using the Audio Converter to produce a smaller OGG file afterward.

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