Drop two or more audio files below, trim and order them, add crossfades if you like, then save the joined result as MP3 or WAV.
Files never leave your device
Drop audio files here, click to browse, or paste
MP3WAVM4AAACOGGFLACWEBA
What This Tool Does
This joiner merges several audio files into one continuous track — stitch voice memos into a single recording, build a workout mix, or combine chapters into one file. Drop your files, put them in order, and save the result as MP3 or WAV.
Each track keeps its own controls: trim handles on the waveform, fade in/out, and a volume slider to balance quiet and loud sources. Everything runs on your device — no upload, no queue, no account.
Crossfade or Hard Cut?
Transition
When to use it
Hard cut (default)
Speech, chapters, takes of the same recording
Crossfade
Music mixes, ambient loops, anything that should flow
The crossfade button sits between each pair of tracks, so you can mix styles: crossfade between songs, hard-cut into an outro. Its length adapts automatically — up to 3 seconds, never more than half of either neighbor.
Tip:Joining recordings made at different volumes? Play the preview and drag each track's volume slider while listening — the export uses exactly what you hear.
Reorder Without Re-Adding
The arrow buttons move a track up or down the list, and the bin removes it — no need to start over when the order is wrong. The live preview always plays the current order, trims, fades, and crossfades: what you hear is exactly what gets saved.
Your Audio Never Leaves Your Device
The decoder is the browser's own; the MP3 encoder is a small WebAssembly build that runs locally. Close the tab and nothing remains.
Frequently asked questions
Is this audio joiner free?
Yes. No sign-up, no watermark, no limits. Everything runs inside your browser, so there is nothing to pay for.
Do my files get uploaded?
No. Decoding, the live preview, and the final merge all happen locally in your browser. Your audio never leaves your device.
Can I mix different formats and sample rates?
Yes. Each file is decoded to a common format first, so an MP3, a WAV, and an M4A can all go into the same joined track — mono and stereo files mix fine too.
How does the crossfade work?
Turn on the crossfade button between two tracks and their boundary overlaps by up to 3 seconds — the first track fades out while the next fades in, so the transition flows instead of cutting.
Can I trim or adjust each file before joining?
Yes — every track has its own trim handles, fade in/out toggles, and a volume slider, so you can cut each clip and balance loudness before merging.
How many files can I join?
There's no fixed track limit. The practical limit is your device's memory — the total joined length matters more than the number of files.
How long can the files be?
Comfortably up to about 2 hours of total output on a typical computer. Multi-hour single files (like a 6-hour audiobook) exceed what a browser can hold in memory and aren't supported yet.
What quality is the exported MP3?
High-quality variable bitrate (LAME VBR, roughly 190 kbps). Choose WAV instead if you need lossless output.