Audio Joiner
Merge songs, voice memos or podcast segments into one file. Reorder them, add a crossfade or a silence gap, adjust each track's volume and even out loudness, then save MP3, M4A or WAV. Free, and your audio never leaves your browser.
Free · No sign-upHow to use Audio Joiner
- 1. Drop your audio files (MP3, M4A, WAV, FLAC, OGG, and even MP4/MOV videos — the sound is used). Add more at any time with ＋ Add files.
- 2. Put them in order: drag a row or use ↑ ↓. Press ▶ to listen to a file and move its Volume slider (−12 to +12 dB) if it's too quiet or too loud.
- 3. Choose what happens between tracks — back to back, a silence gap or a crossfade (0.5–10 s) — and tick Even out loudness if the files were recorded at different levels.
- 4. Pick MP3, M4A or WAV, click Join audio, listen to the result and Download it.
Frequently asked questions
Is the audio joiner free and private?
Yes. It's free with no sign-up or watermark, and joining happens in your browser with ffmpeg compiled to WebAssembly (a one-time ~32 MB download that is then cached). Your files are never uploaded.
How many files can I join?
Up to 50 files at a time. There's no fixed length limit, but the finished file is built in your browser's memory, so hours of WAV audio may be too much for a phone. MP3 or M4A output is much lighter than WAV.
Can I join files in different formats?
Yes. You can mix MP3, M4A/AAC, WAV, FLAC, OGG, Opus and the sound of MP4 or MOV videos. Every track is converted to 44.1 kHz stereo before joining, so the result plays smoothly.
How do crossfades and gaps work?
A silence gap inserts the chosen number of seconds of silence between tracks. A crossfade overlaps the end of one track with the start of the next while fading one out and the other in. A crossfade can't be longer than half of the shortest track, so it is shortened automatically if needed.
What does Even out loudness do?
It measures each track and brings it to the same perceived loudness (−16 LUFS, the common podcast level) before joining, so one song isn't much louder than the next. Your per-track volume changes are applied after that, and a limiter keeps the peaks from clipping.
Does it lose quality?
The joined file is encoded once in the format you choose: MP3 or M4A at 128–320 kbps, or lossless 16-bit WAV. Pick 256 or 320 kbps to stay close to high-quality originals. Tags and cover art from the original files are not copied.