Merge audio files
Combine songs, voice notes or podcast segments into one file. Done on this device, never uploaded.
- Nothing is uploaded
- Works offline after first use
- Open source
- No watermark · limit is your device’s memory; phones hold less
Joins two or more audio files into one MP3 or WAV, in the order you choose, with silence or a crossfade between them. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after your first run to save itself for offline use, and then it works offline.
Done
Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
How it works
- Drop two or more audio files (MP3, WAV, M4A, OGG, FLAC, or the sound of a video), or tap to pick them. Use the arrows to put them in order.
- Choose what goes between them: nothing, a moment of silence, or a crossfade that blends one into the next.
- Merge. The files are joined and written as one MP3 or WAV, which downloads straight away.
In your browser, not on a server
Your browser’s own audio decoders read each file (MP3, AAC in M4A or MP4, Opus or Vorbis, FLAC, WAV) into plain samples at 44.1 kHz in your tab. The sounds are laid end to end, with equal-power crossfades if you chose them, and written once as MP3 by LAME compiled to WebAssembly, or as a 16-bit WAV.
Compared with upload-based tools: Online audio joiners upload every file, cap free use at a few files or a few minutes, and keep the uploads on their servers. Here the files never leave your device, and your device’s memory (phones hold less) is the limit on how many you join.
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Are my files uploaded?
No. Your browser decodes each file and the joined file is written by code in this page. Your files are not uploaded, the page works offline after your first run.
Can I mix different formats?
Yes. An MP3, a WAV from a recorder and an M4A voice memo can be joined together; everything is converted to 44.1 kHz on the way. If any file is stereo, mono files are played in both ears.
Does merging lower the quality?
Saving as WAV keeps every sample. MP3 is re-encoded once at the quality you choose; at 192 kbps or more the difference from the originals is very hard to hear.
Can I cut the files before joining them?
Use Trim audio on each file first to cut the start or end, then merge the trimmed files here.
More video and audio tools
Mic test
Check that your microphone works before a Zoom, Teams or Discord call: speak and watch the level, then play back five seconds to hear how you sound. Nothing is uploaded.
Webcam test
Check that your webcam works before a Zoom, Teams or interview call: see the live picture, the real resolution and the measured frame rate. Nothing is uploaded.
Audio to video
Put a song, a podcast episode or a voice note on a still picture, ready for YouTube or social apps. Made on this device.
Compress audio
Shrink recordings, podcasts and songs to send or store. Done on this device, never uploaded.
Popular conversions
Guides
- How to merge audio filesJoining voice notes, podcast segments or songs end to end is simple once you know the right tool. Here is the desktop way and a private browser way.