Is my audio uploaded to a server for merging?

No. Merging is performed entirely within your browser using FFmpeg.wasm. All source files are read locally, combined in browser memory, and the merged output is downloaded directly to your device without any file content being transmitted to a server.

How does crossfade work and what duration should I use?

Crossfade gradually fades out the end of one audio segment while fading in the start of the next, creating a smooth blend rather than an abrupt cut. For music transitions, a crossfade of 1–3 seconds sounds natural. For speech or podcast content, a 0-second crossfade (clean cut) usually sounds better than a fade blend.

Does merging files reduce audio quality?

If all source files are in the same format and specification, merging requires minimal re-encoding and quality impact is negligible. If the tool needs to resample files to match a common sample rate, a small amount of quality change is introduced. Using WAV source files eliminates this concern entirely, as WAV is lossless.

Is there a limit on how many files I can merge?

There is no enforced file count limit, but available browser memory is the practical constraint. Merging many long audio files simultaneously may slow or crash the browser tab on low-memory devices. If you encounter issues, merge files in batches of 5–10 and then merge the resulting files in a second pass.

merge

FreeNo Upload

Audio Merger

Merge multiple audio files into one. Adjust order and download as WAV.

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audio_file

Drag & drop or click to upload

Drop your audio file here

How to Use

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Upload your audio files

Select two or more audio files to combine. Drag to reorder them in the sequence they should play. All files must be the same format.

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Arrange the sequence

Reorder files by dragging. Preview the total combined duration. Remove any file from the list before merging if needed.

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Merge and download

Click Merge to combine all files into a single audio track. Download the merged file — ideal for podcast episodes, mixtapes, or audio compilations.

What is Audio Merger?

Audio merge tool combines multiple audio files into a single sequential audio file, with an optional crossfade between segments for smooth transitions. It supports MP3, WAV, OGG, and FLAC source files and processes everything locally in the browser. Podcast producers, audiobook creators, and musicians use audio merging to assemble finished productions from separately recorded or edited segments.

Why use Audio Merger?

The built-in crossfade feature creates professional-sounding transitions between segments without requiring a full digital audio workstation or post-production engineer. Browser-based processing via FFmpeg.wasm keeps audio projects private and works offline once the tool is loaded, which is useful in studio environments with restricted internet access. Merging multiple short files into one simplifies media library management and playback.

lockComplete privacy — Your files never leave your device or browser.
boltInstant processing — No wait times, no server queues, no upload delays.
money_off100% free — No subscriptions, no credits, no hidden fees.
person_offNo registration — Start using immediately, no account needed.
devicesWorks everywhere — Any modern browser on desktop, tablet, or mobile.

How it works

A podcaster joins an intro jingle, main interview, and outro music file into a single finished episode ready for upload. An audiobook narrator combines chapter recordings into a complete book file after editing each chapter individually. A music producer assembles separately recorded instrument takes into a single demo track for a client to preview.

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Pro Tip

Set crossfade duration to 0.5–2 seconds for music transitions and 0 seconds for speech segments where a clean cut sounds more natural than a fade. All source files should have the same sample rate and channel count before merging — mismatched formats will be resampled automatically but a consistent source format guarantees the best quality.

Frequently Asked Questions

The tool supports merging MP3, WAV, OGG, and FLAC files. For the cleanest merge, all source files should share the same sample rate and channel count (mono or stereo). Files with mismatched specifications will be resampled automatically during the merge process.

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Tutorial