Audio Joiner & Concatenator
Merge multiple audio files into one track in your browser via Web Audio API. Crossfade support, no upload, free and private.
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What is Audio Joiner & Concatenator?
Audio Joiner & Concatenator merges multiple audio files into one track using the Web Audio API. Files are decoded locally, concatenated with optional crossfade, and exported as a downloadable WAV file - all in your browser with no upload.
Key Benefits
- Merge voice memos, podcast segments, and music tracks without software
- Crossfade smooths transitions between segments
- Files processed locally - recordings stay on your device
- No watermarks, time limits, or accounts
- Works on mobile and desktop browsers
Common Use Cases
- •Combining podcast episode segments into one file
- •Merging voice memos for a single recording
- •Creating DJ-style mixes with crossfade between songs
- •Concatenating audio clips for video production
How to Join Audio Files
- Add audio files: Select the audio files you want to join - they are decoded and added to the queue.
- Set crossfade: Optionally set a crossfade duration for smooth transitions between tracks.
- Join and download: Click join to merge the tracks, then download the combined WAV file.
Key Features
- Merges MP3, WAV, OGG, and WebM files into a single WAV track
- Adjustable crossfade duration for smooth transitions
- Reorder and remove tracks before joining
- Processes entirely via Web Audio API - no upload needed
- One-click WAV download after joining
- Works on any device with a modern browser
Frequently Asked Questions
What audio formats can I join?
Any format supported by the Web Audio API including MP3, WAV, OGG, and WebM. The output is always WAV.
What is crossfade?
Crossfade smoothly blends the end of one track into the start of the next by overlapping them, eliminating abrupt silence or clicks at the junction.
Is my audio uploaded to a server?
No. All processing happens via the Web Audio API in your browser - files never leave your device.
Is there a file size or duration limit?
The practical limit is your device memory. Very long recordings may slow down processing on mobile devices.