Merge MP3 Files — Free Audio Joiner, No Upload
Join MP3, M4A, WAV, FLAC and video soundtracks into one file. Reorder, trim each track on a waveform, add fades, save as MP3, M4A, WAV, FLAC or OGG — free, browser-only, no upload.
Example: intro.m4a · take2.wav 3s–90s · outro.mp3 → one MP3
Merge MP3 Files — Free Audio Joiner, No Upload
Combining audio usually means more than gluing files together: the takes need to be in the right order, and the count-in on track three has to go. Drop your files and each one becomes a track in a list; move tracks up or down to set the running order, select any track to trim it on its waveform or cut a section out, add a fade at the start or end, and save the whole sequence as one MP3 — or M4A, WAV, FLAC or OGG. Mixed formats are fine: an M4A voice memo can follow an MP3 and a WAV. Everything runs in your browser, so the recordings are never uploaded.
Order You Control
Move any track up or down. The result follows the order on screen, not the order you dropped the files in.
Trim While You Join
Select a track to trim it on its waveform or cut a section out of it — each track keeps its own edit.
Handles Mixed Sources
MP3 next to M4A, WAV, FLAC or an MP4 soundtrack, mono alongside stereo — every track is converted to one shape before joining.
100% Browser-Only
No upload, no server copy, no watermark. Decoding, editing and encoding all run inside the tab.
!How It Works, Step by Step
Drop the files you want to join. Each becomes a track; nothing is uploaded.
Reorder the tracks with the arrows, and select any track to trim it.
Add a fade in or out if you like and preview the whole result.
Choose MP3 or another format and save one file.
In Your Browser vs. on a Server
| Feature | Local (Us) | Cloud Tool |
|---|---|---|
| Privacy | Joined in your browser, never uploaded | Every file uploaded to a server |
| Trim each track | Yes, on its own waveform | Often a separate step |
| Mixed formats | MP3, M4A, WAV, FLAC, OGG, video soundtracks | Varies |
| Crossfades between tracks | No — joins are seamless, fades at start and end | Some tools |
Technical FAQ
How do I merge several MP3 files into one?
Can I join files that are not all MP3?
Can I trim the tracks before joining them?
Is there a gap or crossfade between tracks?
Is merging audio online safe for private recordings?
How many files can I join at once?
Keep the Work on Your Own Device
Every tool here runs in your browser, with no upload and no account. Here is another one worth knowing about.
Just need to trim one file?