Audio Joiner
Join MP3, WAV and M4A files into one track. Reorder clips, add gaps or crossfades, fade in and out, normalize, export MP3 or WAV. Free and never uploaded.
- No upload — 100% private
- Instant, on your device
- Free, no sign-up
- Works offline once loaded
How it works
How to use Audio Joiner
Drop two or more audio files — MP3, WAV, M4A, OGG or FLAC, even mixed together.
Put them in order by dragging the grip, or focus it and use the ↑ / ↓ keys.
Choose a gap of silence or a crossfade between clips, and an optional fade in and fade out.
Pick MP3, WAV or M4A and click Join & download. Check the waveform and play the result.
Why use it
Why use our Audio Joiner tool
Mix any formats
Combine an MP3, a WAV and a voice memo in one go — everything is resampled to the same sample rate automatically.
Gaps or crossfades
Add up to 5 seconds of silence between clips, or blend them with a smooth equal-power crossfade for DJ-style transitions.
Fades and normalize
Fade the whole mix in and out, and normalize the peak to −1 dB so quiet and loud clips end up at a sensible level.
Waveform preview
See the waveform of the joined track and listen to it right on the page before sharing.
Private and offline
Decoding, mixing and encoding run in your browser. Your audio is never uploaded.
FAQ
Frequently asked questions
How do I merge MP3 files into one?
Drop the MP3s here, arrange them in the order you want, leave the gap at 0 ms for a seamless join, choose MP3 and click Join & download.
Can I join files with different formats or sample rates?
Yes. Every clip is decoded and resampled to the output sample rate (44.1 or 48 kHz), and mono clips are played on both stereo channels.
What's the difference between a gap and a crossfade?
A gap inserts silence between clips, making the result longer. A crossfade overlaps the end of one clip with the start of the next, making it shorter and smoother. Crossfades are limited to half the shorter clip.
Is there a limit on the number of files?
No fixed limit. Everything is mixed in memory, so very long results (several hours) may be too much for phones.
Are my files uploaded?
No. The whole process happens inside your browser tab.
Related tools
Audio Converter
Convert MP3, WAV, M4A, OGG and video sound — in batches.
Audio Trimmer
Cut songs and voice notes, add fades and make ringtones.
Screen Recorder
Record screen, tab or window with mic and webcam.
Create ZIP File
Bundle files and folders into one .zip — right in your browser.
Trim Video
Cut the start and end off any video — fast, exact and private.
Compress Video
Shrink videos to any size or convert them to MP4 — in your browser.
Video to GIF
Make smooth, small animated GIFs from MP4, MOV or WebM clips.