Join audio files
Put voice notes, songs or recording takes into one file, in the order you choose: a straight cut, a crossfade or a pause between them, and every file brought to the same level if you like. Nothing is uploaded.
Updated October 31, 2026
Options
Files are joined from top to bottom: drag the rows to change the order.
How it works
- Drop two or more audio files anywhere on this page.
- Put them in order: drag the rows, use the arrows, or sort by name or date.
- Choose what goes between them and the format, then download the joined file.
Voice notes, podcast segments, a set list
A dozen WhatsApp voice notes from one conversation become a single recording to keep or to transcribe. The intro, the interview and the outro of a podcast become one episode. A playlist of songs becomes one file for a party or a long drive. Drop the files, sort by date for voice notes or by name for numbered takes, drag anything out of place, and the total length appears under the list.
What goes between the files
A straight cut is right for takes of the same recording. A crossfade of up to 5 seconds blends songs into one another without a dip in level; two to four seconds is the usual range. Silence of up to 10 seconds gives listeners a breath between chapters or tracks. Level each file brings every file to the same peak before joining, which tames a voice note recorded in a quiet room next to one shouted in the street.
Format, size and phones
Like the first file keeps the kind of the first file, so a set of MP3s comes back as MP3; pick MP3 explicitly when the sources are mixed and the result must play anywhere. Up to 50 files of up to 2 GB each can be joined. All of them are decoded and held in memory in your browser at once, so a phone manages a few minutes of audio and a computer about an hour; nothing is uploaded.
Why people use it
Free, no account
Every tool is free, with no sign-up, no e-mail address and no limit on how often you use it.
Your files stay on your device
The browser opens the file and processes it in memory, on your device. Nothing is uploaded, so nothing can be kept, leaked or looked at.
No watermark
The result is yours as it is: no watermark, no branding, no trial version.
Any device
A phone, a tablet or a computer with a current browser is enough: no app to install, no software to update.
Works offline after the first visit
The browser keeps the pages and their engines, so a tool you have opened once keeps working without a connection.
Open-source engines
The code that does the work is open-source software, named on the Licences page, running as WebAssembly in your browser.
Why it is private
Everything you type or drop here is handled by your browser, on your device. Nothing is uploaded. To verify, open your browser's developer tools, go to the Network tab, and use the tool: you will see no request carrying your data.
While a file is being processed, the counter under the result shows the page's network traffic: 0 requests and 0 B for your data.
How to check it yourself, step by step
What you can check yourself
Open your browser's developer tools on the Network tab before you drop a file: while the tool works you will see no request carrying your data, and the counter under every result shows the page's own measurement.
The site sets no cookies, so there is no cookie banner. Anonymous usage counts and error reports without file names are the only things that leave the page, as the privacy policy describes.
Every change goes through thousands of automated tests in three browser engines, including a guard that fails a test if a single byte of a file leaves the page.
Frequently asked questions
- In what order are the files joined?
- In the order of the list, top to bottom. Drag a row (hold it first on a touch screen), use its arrows, or sort by name or date. After a change the result is marked out of date until you join again.
- Can the files fade into each other?
- Yes. Choose 'Crossfade' and a length of up to 5 seconds: the end of one file and the start of the next overlap, one fading out while the other fades in at equal power, so the level does not dip. 'Silence' puts a pause of up to 10 seconds between them instead.
- My recordings are not equally loud. Can it fix that?
- Tick 'Level each file' and every file is brought to the same peak level before joining. It is a peak level, not perceived loudness: a recording with one loud click may still sound quieter than the rest.
- Which format and quality do I get?
- 'Like the first file' keeps the first file's kind: MP3 stays MP3, AAC becomes M4A, Opus and OGG become Opus, FLAC stays FLAC and WAV stays WAV. The files may mix formats, mono and stereo, and sample rates: the result takes the highest sample rate among them (at most 48 kHz for MP3, AAC and Opus) and the most channels. Joining always decodes the files and encodes the result once, even when they share a format. Titles and covers are not carried over, since the first file's title would name the whole join.
- Is anything uploaded?
- No. The files are decoded, joined and encoded in a Web Worker in your browser; the network meter under the result shows 0 B. All of them are held in memory at once, so the total length depends on your device: about an hour of stereo on a computer, a few minutes on a phone.
- Can I join WhatsApp voice notes into one file?
- Yes. The .opus or .ogg files are accepted; with Like the first file the result is Opus, or choose MP3 so it plays everywhere.
- Does it work on a phone?
- Yes, in the browser, for a handful of short files. A long playlist can exceed a phone's memory, and the tool says so before it starts.
- Does joining lose quality?
- The files are decoded and the result encoded once. With WAV or FLAC nothing is lost; with MP3, AAC or Opus the loss is small and hard to hear.
- Can I cut the start or the end of a file before joining?
- Not here. Trim each file with Trim audio first, then drop the trimmed files in this list.
- Can it beat-match or mix songs like a DJ?
- No. It plays one file after another, with a plain cut, a crossfade or a pause between them; tempo and key are not changed.
Install it as an app
Chrome, Edge and Android browsers offer to install this site from the address bar or the menu; on iPhone use Share, then Add to Home Screen. It opens like an app, keeps working offline and still processes everything on your device.