Only Trusted Audio Merger
Join several audio files into one, in the order you choose, with a pause or a blend between them. Everything runs on your device.
Free · No uploads · On-deviceDrop audio files here, or click to choose
MP3, WAV, M4A, OGG or FLAC — add as many as you like, one batch or one at a time. You can also paste files in. They stay on your device: nothing is uploaded.
1 · Your tracks
Set every space the same way:
MP3, WAV, M4A, OGG and FLAC. Drag rows by the handle to change the order. Between each pair of tracks, two dropdowns say what happens there: the effect, and when there is one, how long it lasts.
2 · Merge
Format
Add at least two audio files to merge.
Files are decoded one at a time, so a long list does not fill your device’s memory. Merged MP3s are capped at 60 minutes of audio; WAV has no cap, but the files get large.
Merged file ready
DownloadProcessed on this device: 0 · Uploaded: 0
Merge preview
The merged file on one line, drawn the way the Audio Extractor draws audio: a green waveform for each track, a dim space for a pause, an orange band for a blend, where the two tracks overlap and the total gets shorter.
Good to know
Nothing is uploaded: your audio never leaves this device. Merging happens in your browser.
Any mix of formats: MP3, WAV, M4A, OGG and FLAC can be mixed in one merge; the output is one clean file.
Same encoder as the Extractor: MP3s are encoded at 192 kbps with the encoder already on this site. No new downloads.
How it works
Joined on your device, in the order you set
Each file is decoded in your browser, the tracks are laid end to end with the pauses and blends you picked for the spaces between them, and the result is written out as one file. Nothing is sent anywhere: closing the page removes everything.
- 1. Add your files: as many as you like, in any mix of formats.
- 2. Order and set the spaces: drag tracks into order, then choose a pause or a blend, and its length, for each space.
- 3. Merge and save: one MP3 or WAV file downloads to your device.
Guide
Pause or blend?
A pause puts clean silence between tracks. It suits chapters, episodes, lessons and voice notes, where each part should start fresh and the join should be easy to hear. A blend fades the end of one track out while the next fades in, so the sound never fully stops. It suits music sets, ambient recordings and interviews split across files, where a hard cut would jar. When the tracks are parts of one recording that was split, play straight through: the join disappears.
MP3 or WAV?
MP3 at 192 kbps plays everywhere and stays small, about 1.4 MB per minute. WAV keeps the joined audio at full 16-bit quality, about 10 MB per minute, and is the better pick if the merged file will be edited further or archived. MP3 encoding uses lamejs, the MP3 encoder in JavaScript, under the LGPL; it is the same encoder the Audio Extractor uses. The merged file carries no watermark.
Questions
Is my audio uploaded?
No. The merging happens inside your browser, on your device. The counter on this page stays at Uploaded: 0 because nothing leaves the device. You can prove it: load this page, turn off your connection, and merge anyway.
What happens between the tracks?
You decide, separately for every pair of tracks. Each space between two tracks has two dropdowns: play straight through, add a pause of silence from 1 to 10 seconds, or blend, where the end of one track fades out while the next fades in over 1 to 10 seconds. A blend overlaps the two tracks, so the merged file gets shorter by the blend length.
Which formats can I add?
MP3, WAV, M4A, OGG and FLAC, and most other audio your browser can play. Formats can be mixed freely in one merge. A file your browser cannot decode is marked in the list and left out, with the reason shown.
Does merging change the sound quality?
The tracks are decoded and joined, then written out again. MP3 output is encoded at 192 kbps, which is clean for speech and most music. Pick WAV if you want the joined audio kept at full 16-bit quality, for editing or archiving.
Is there a length limit?
Merged MP3s are capped at 60 minutes of audio, and a longer merge is refused with the reason on screen. WAV has no cap, but the files get large, about 10 MB per minute. Your files are decoded one at a time during the merge, so a long list does not fill your device's memory.
Can I change the order of the tracks?
Yes. Drag a track by the handle at the left of its row. The numbering, the merge preview and the total length update as you reorder, and the merged file follows the list from top to bottom.