Free Online Audio Joiner
Combine MP3, WAV, M4A, or video audio into one track. Free, no signup, no upload — everything runs in your browser.
What does this tool do?
Use the audio joiner and MP3 merger to combine multiple audio or video files into a single continuous track. Drop files in, reorder them, trim clips when needed, and download the result as MP3 or WAV. Great for podcast compilations, song mashups, and audiobook stitching.
Supports many formats
MP3, WAV, M4A, AAC, OGG, FLAC, plus MP4 / MOV / WebM videos (we extract the audio track).
Reorder before joining
Drop files in any order. Use the up / down arrows to arrange them, then click Join.
Mismatched files just work
Different sample rates and channel counts (mono vs stereo) are auto-aligned before joining. No need to convert beforehand.
Output formats
MP3 (192 kbps) for sharing, podcasts, or audiobooks; WAV (lossless 16-bit PCM) for DAW editing or audio archival.
Audio joiner FAQ
How many files can I join at once?
There's no hard limit, but very long audio or large batches may hit your browser's memory limits. A few typical songs usually work well.
Will the joined file have any gaps between tracks?
No, files are concatenated back-to-back with no silence inserted. If you want a gap, add a silence file between them.
Can I join audio from videos?
Yes. Drop MP4, MOV, or WebM video files — we extract the audio track and join it with the others.
Do my files get uploaded to a server?
No. Everything runs in your browser using the Web Audio API. Files never leave your device.
What if files have different sample rates or channels?
The first file sets the target sample rate and channel layout where possible. Download format is controlled by the MP3 / WAV output setting.