Audio Merger – Combine MP3 WAV Files Online (Free)
Free online audio merger. Combine multiple MP3, WAV, OGG, M4A, FLAC, AAC, Opus files into one. Drag-and-drop ordering, lossless concat when codecs match. Runs locally via FFmpeg WASM.
Example Output
One combined audio file with all sources concatenated in your chosen order.
merged.mp3 (40 min, single seamless file)
What is Audio Merger?
Combine multiple audio files into one — perfect for stitching podcast chapters, joining recorded segments, or building a long-form mix from short clips. The tool uses FFmpeg's concat demuxer for lossless merging when sources match codec/rate, and transparently transcodes when they differ.
Why use this tool?
- Works on desktop, tablet, and mobile in any modern browser
- Stable behavior across visits — no surprise version drift
- Your data stays private — all processing happens locally in the browser
How to use
- Add 2+ audio files (drag-drop or click)
- Reorder them with ↑/↓ to set the play order
- Pick output format
- Click Merge Audio and download
Examples
Audiobook chapters
12 chapter MP3s of an audiobook merge into one continuous file for easier listening on a single play queue.
Voice-memo log
Daily voice memos for a week merge into one weekly file for archiving.
Multi-segment recording
A long recording captured as 3 separate WAV files (battery / app interruptions) merges back into one seamless WAV.
Common use cases
- Audiobook chapter assembly
- Voice-memo archival
- Stitching split recordings
- Building long-form mixes from clips
- Conference panel assembly
Troubleshooting
- Audible click between merged segments
- Sources have different sample rates — re-encode all to 44.1 kHz first, or just trust the auto-transcode that happens when rates differ.
- Output is huge
- Pick a lossy output (MP3 / OGG / Opus) at a sensible bitrate. WAV / FLAC keep every source uncompressed and grow with total duration.
- One file refuses to merge
- It's probably a non-audio file or DRM-protected. Convert it to a plain MP3/WAV first, then re-merge.
Frequently Asked Questions
Yes — files are joined in the order you list them. Use the ↑ / ↓ buttons to reorder before merging.
Try these related tools
Explore more Audio Tools
Discover other free, privacy-first tools in Audio Tools.