Merge Audio Files
- Free
- No upload
- No watermark
Quick answer
To merge audio files, you concatenate them — the second file starts the instant the first ends, the third after that, and so on, producing one continuous track. This tool joins two or more files in the order you add them, in your browser, with nothing uploaded. First use downloads the ~10 MB engine once; after that it is cached, so later merges begin immediately.
Step by step
How to merge audio files
- 01
Add your files
Drop in two or more audio files. Podcast segments, song parts, voice notes — anything you want played back to back.
- 02
Check the order
Files join in the order you add them, listed top to bottom, so the first one is heard first. To change the sequence, remove a file with its × and add it again, or start over.
- 03
Merge and download
Click merge to join them end to end and download the single combined file.
In depth
How does joining files end to end work?
Merging is concatenation: the tool lines your files up nose to tail and writes them as one stream, so there is no overlap and no gap unless you introduce one. It is not mixing — the files do not play at the same time, layered on top of each other. If you want two sources playing simultaneously (a voice over a music bed, for instance) that is mixing, a different operation. Merge is for sequence: part one, then part two, then part three.
Order is the one thing you control that no later step can fix cheaply, so it is worth getting right before you export. The tool plays your list strictly top to bottom, and because the join is a single pass there is no crossfade inserted between items unless you add one — the last sample of one file is immediately followed by the first sample of the next. If you want a beat of silence between segments, add it to the individual files first, then merge.
Do the files need to be the same format?
No. MP3, WAV, M4A, FLAC and OGG can be mixed freely, and so can different sample rates and mono with stereo. The tool decodes every clip, brings them to one sample rate and channel layout, joins them end to end and encodes the result once, as a 192 kbps MP3. That final encode always happens, so a merge is not lossless even when every input is the same format: start from the best-quality files you have. Only the audio is joined, so cover art in the source files is left out.
| Situation | What the tool does | Result |
|---|---|---|
| Same codec, rate & channels | Decode, join, encode once | One 192 kbps MP3 |
| Same codec, different rate | Resample to a common rate, then join | One 192 kbps MP3 |
| Different codecs (MP3 + WAV) | Decode each, join, encode once | One 192 kbps MP3 |
| Mono mixed with stereo | Upmix to a common channel layout | One 192 kbps MP3 |
What is merging good for?
- Assembling a podcast from an intro, the interview and an outro.
- Stitching song stems or movements into one continuous piece.
- Combining chapter-by-chapter audiobook recordings into a single file.
- Joining a run of voice memos into one shareable track.
Are my files uploaded to merge them?
No. All of your files are read into memory and concatenated by ffmpeg.wasm inside your browser tab; the combined file is built locally and offered as a download. Nothing is sent anywhere. Verify it in DevTools → Network: merge a batch and watch — no upload request is made. For unreleased tracks or confidential recordings, that means the raw material never leaves your machine.
Related audio and video tools
The reverse operation is split audio, which cuts one file into two. Want to top and tail a part before merging? Use trim audio. Merged podcast too large to email? Compress the audio afterwards. And if a segment is currently trapped in a video clip, extract the audio from the video first, then bring it in here.
Your files never leave your device
Processed locally in your browser — nothing is uploaded. You can verify it yourself: open your browser’s developer tools, watch the Network tab, and use the tool — no upload request is ever made.
- No file is ever uploaded to a server
- Works offline after the first visit
- No account, no watermark, no limits
A little more clarity
Frequently asked questions
01How many files can I merge at once?
As many as fit in your device’s memory — well into the dozens on a typical machine. Add them all in the order you want and merge in one pass.
02Can I merge an MP3 with a WAV?
Yes. Every clip is decoded and the join is encoded once as a 192 kbps MP3, so different formats and sample rates merge cleanly. That final encode always happens, so merging is not lossless.
03Does merging overlap the files or play them together?
Neither. Files play strictly one after another. Layering two sources at once is mixing, which is a separate operation.
04Why is there a click where two clips meet?
Usually a loudness jump or a non-zero waveform at the boundary. Normalise the parts first, or add a brief fade at the seams, and the pop disappears.
05What order will the files play in?
The order you added them, top to bottom. There is no drag-to-reorder: to change the sequence, remove a file with its × and add it again, or start over.
06What format is the merged file?
Always an MP3 at 192 kbps, whatever the inputs were. If you need another format, run the merged file through the audio converter.
07Is anything uploaded?
No. The merge runs entirely in your browser via WebAssembly. You can confirm there is no upload in the Network tab of your developer tools.
Guides
Further reading
- Guide3 min readHow to merge audio files into one trackMerging audio means joining several files end to end so they play as one continuous track. It is the everyday job behind stitching podcast segments, combining voice notes, or assembling a set — and it takes seconds in the browser.Read the guide
- Guide5 min readHow to normalize audio (and why your tracks sound uneven)If some tracks blast and others whisper, normalizing is the fix. This guide explains the two kinds of normalization, what LUFS means, and the targets that match how streaming platforms already play your music.Read the guide
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