Audio Merger
Combine multiple audio files into one track
Audio Merger joins multiple audio files into one continuous track, decoding everything to raw PCM in your browser and stitching the buffers back to back.
Content reviewed: August 24, 2026
Encrypted with HTTPSProcessed in your browser
All processing runs locally in your browser. Your files and text are not sent to Tool-web's server.
Actions:
How to Use
- Upload multiple audio files
- Arrange them in the desired order
- Click "Merge" to combine
- Download the merged audio file
Features
- Multiple file merging
- Drag-and-drop reordering
- Crossfade option
- Supports multiple formats
- Preview before download
Tips for getting Audio Merger right
- Matching sample rates and channel counts across inputs avoids pitch/speed surprises
- Files join in list order — arrange before merging, there's no post-reorder
- Long inputs consume RAM proportionally; merging hours-long podcasts can exhaust browser memory
What actually happens
Each file is decoded via the Web Audio API to an AudioBuffer, buffers are concatenated sample-by-sample, and the result is encoded back to WAV. Decoding normalizes differing container formats — MP3 + WAV inputs merge fine as long as rates match.
Limitations worth knowing
- Output is WAV — large but universally compatible; convert to MP3 afterwards if size matters
- Crossfades aren't applied; joins are hard cuts
- Sample-rate mismatch gets handled by resampling, which slightly alters duration of the odd one out
Frequently Asked Questions
Can I merge files of different formats?
Yes. The tool automatically normalizes audio formats during the merge process.
Is there a file size limit?
The tool handles files up to 500MB each. Total merged length depends on browser memory.
Can I add transitions between tracks?
Yes. A crossfade option smoothly blends the end of one track into the beginning of the next.
Privacy & Security
Merging runs entirely in-browser via Web Audio. Audio never touches a server.
Tips & Best Practices
- Matching sample rates and channel counts across inputs avoids pitch/speed surprises
- Files join in list order — arrange before merging, there's no post-reorder
- Long inputs consume RAM proportionally; merging hours-long podcasts can exhaust browser memory
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