Audio Joiner — Merge MP3 and Audio Files Online, Free
Join several audio files in any order into one track, with optional crossfades or gaps. Free, no sign-up, and your files never leave your device.
Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.
Combine several audio files into one track. Add your clips, drag them into order, optionally add a crossfade so each blends smoothly into the next — or insert a few seconds of silence between them — and download the result as MP3, WAV, M4A or OGG. Files with different sample rates or channel counts are matched automatically.
Step by step
- Add two or more files: Drop the clips onto the upload area.
- Arrange them: Drag rows or use the arrows to set the order; the total length is shown underneath.
- Set transitions: Enter a Crossfade in seconds, or a Silence between clips gap.
- Join: Pick a format and click Join & download.
Handy for
Audiobook chapters
Merge chapter files into a single listening file.
Mixtapes
Blend songs together with crossfades.
Recording sessions
Stitch a recording that was split into several files.
Language lessons
Join phrases with pauses between them for practice.
Good to know
Crossfades of 2–5 seconds suit music; use gaps rather than crossfades for speech.
Join first, then use the Volume Booster to even out the overall level.
Questions
Do clips need the same format?
No — mix MP3, WAV, M4A and others freely. Everything is converted to the highest sample rate and channel count among your clips.
Is there a length limit?
There's no fixed limit, but editing tools hold the decoded audio in memory — about 21 MB per minute of stereo sound (32-bit samples). An hour-long recording is fine on most computers; multi-hour files may be slow on phones.
Are my audio files uploaded anywhere?
No. Decoding, editing and encoding all happen inside your browser tab. Nothing is sent to a server, and closing the tab discards everything you haven't downloaded.
Further reading
- Make a Ringtone or Clean Clip: Cut, Fade, Join and Boost Audio — Cut up to 30 seconds as an iPhone .m4r or Android MP3 ringtone, then add fades, join clips and normalise to −1 dBFS without clipping.
More Audio Tools tools
- Online Voice Recorder — Record your voice with a live level meter, pause and resume, then save as MP3 or WAV.
- Change Audio Speed — Speed up or slow down audio from 0.5× to 3×, keeping the original pitch or shifting it like a tape.
- Volume Booster & Normaliser — Boost or reduce loudness, or normalise to a target peak, with a soft limiter that prevents distortion.
- Reverse Audio — Flip any recording so it plays backwards, and save the result as MP3 or WAV.
- Fade In & Fade Out Audio — Add a smooth fade-in and fade-out to any track, choosing the length and curve.
- Text to Speech — Have text read aloud with your device's voices, or generate a downloadable spoken MP3 or WAV.