Audio Joiner
Combine songs, voice recordings, podcast segments or audiobook chapters into a single file. Put them in order, trim each part, blend them with smooth crossfades and even out volume differences — all in your browser, without uploading anything.
- No upload
- Any formats
- Crossfades
- Free
Drop the files you want to join
or
You can also paste with Ctrl+V (⌘+V on Mac) or drop a whole folder.
MP3 · WAV · M4A · AAC · FLAC · OGG · OPUS · MP4 / MOV video
Your files are processed on your device and are never uploaded.
This tool needs a recent browser with WebAssembly and Web Workers: Chrome, Edge, Firefox, Safari or Samsung Internet. Please update your browser or try another one.
Done — your file is ready
You changed the settings — click the button again to update the result.
Drag the handle or use the arrows to change the order. Click “Trim” to use only part of a file.
How to merge audio files
Order, trim, join.
- 1
Add files
Drop two or more audio or video files onto the page.
- 2
Arrange
Drag them into order, trim parts if needed and choose crossfade, direct join or pause.
- 3
Join & download
Click “Join”, listen to the result and download your single file.
More than gluing files together
A smart audio merger.
Mix any formats
MP3 with WAV, M4A with FLAC — sample rates and channels are converted automatically.
Easy ordering
Drag & drop, arrow buttons or Alt + ↑/↓.
Trim each part
Use only the chorus of one song or cut the intro of a recording before joining.
Crossfades & pauses
Smooth DJ-style transitions or clean pauses between segments.
Match loudness
Quiet and loud parts are evened out so nobody has to touch the volume.
Any output
Save as MP3, M4A, WAV, FLAC, OGG or AAC in the quality you choose.
Private
Files are joined on your device.
Free
No limits, no watermark.
Joining audio: crossfade, direct or pause?
Crossfade overlaps the end of one part with the start of the next while fading between them (equal-power curve, so the volume doesn’t dip). 2–5 seconds sounds natural for music mixes; shorter fades (0.2–0.5 s) hide clicks between speech recordings.
Direct plays the parts back to back with no overlap — the right choice for audiobook chapters, live recordings split into tracks or anything that must stay gapless. Pause inserts silence, useful between podcast segments or language-learning phrases.
Files with different formats, sample rates or channel counts are converted to a common format (the highest sample rate is used). Turn on Match loudness when parts were recorded at different levels.
Recommended settings
| Project | Transition | Extras |
|---|---|---|
| Music mix / playlist | Crossfade 3–6 s | Match loudness |
| Podcast segments | Pause 0.5–1 s | Match loudness |
| Audiobook chapters | Direct | — |
| Voice recordings | Crossfade 0.2 s | Fade in/out 0.5 s |
| Ringtone from 2 songs | Crossfade 1 s | Trim each part |
Tips
- Cut a part out of the result with the Audio Cutter.
- Make the joined file smaller with the MP3 Compressor.
- See the total length before joining with the Audio Duration Calculator.
- Normalize the final mix to −14 LUFS with the Volume Normalizer.
Frequently asked questions
Can’t find your answer? Contact us — we reply quickly.
How do I join two MP3 files?
Drop both files onto this page, put them in the right order and click “Join 2 files”. Download the combined MP3.
Can I join files of different formats?
Yes. You can combine MP3, WAV, M4A, FLAC, OGG and even the sound of videos; everything is converted to the output format you choose.
How do I add a crossfade?
Choose “Crossfade” under Transition and set the length (e.g. 3 s).
Can I use only part of a file?
Yes. Click “Trim” on the file and drag the handles on the waveform.
Is there a limit on files or length?
No artificial limit; very long results are written to your browser’s temporary storage to save memory.
Are my files uploaded?
No. Joining happens entirely in your browser.
More free audio tools
Compress, convert, cut, join and analyse audio — fast, free and private, right in your browser.