Are my audio files uploaded to a server?

No. The entire merge happens inside your browser. Every file you add is read into memory on your own device, joined locally by a WebAssembly build of FFmpeg, and the merged MP3 is handed straight back to you as a download — no byte of any file is ever sent to us or anyone else. This is especially valuable when the clips are private voice notes or recordings; they never leave your machine, and only the single merged file is produced. Close the tab and nothing is retained.

Can I mix different formats in one merge?

Yes — that is the whole point. You can combine MP3, WAV, M4A, AAC, OGG, and FLAC files in any mix within a single merge. The tool decodes each file and re-encodes the joined result, so it does not matter that your inputs started in different formats or at different sample rates. Whatever combination you add, you get back one clean, continuous 192 kbps MP3 that plays virtually everywhere.

What controls the order of the merged file?

You do. The files are joined in the exact order shown in the list, from top to bottom. Each row has up and down controls so you can move a file earlier or later, and you can remove any file you added by mistake. Whatever order you arrange before pressing Merge is exactly how the final track will play, so it is worth a quick check before you start.

Why does the merged file come out as one 192 kbps MP3?

MP3 at 192 kbps is the most universally compatible audio format — it plays on every phone, music app, and car stereo, and stays a reasonable size. Because the tool already decodes every input to join them, re-encoding the result to a single MP3 gives you one predictable, widely playable file regardless of what formats you started with. There are no settings to adjust; every merge produces the same dependable output.

Is there a limit on file size?

Yes — 500 MB for the combined size of all the files you add, not per file. Because every file is loaded into your browser tab’s memory together to be merged, the total has to fit comfortably, and very large batches would risk crashing the tab. Audio files are usually small, so in practice you can merge many of them before approaching the limit — and the running total is checked as you add files.

Convert

Merge Audio

Join several audio files into one MP3, in the order you choose, right in your browser. Mix MP3, WAV, M4A, AAC, OGG, and FLAC freely. Nothing is uploaded. Free, no signup.

By the Samastam teamLast updated 2026-06-14

Drop audio files here, or click to browse

Files add to the list · everything runs in your browser — nothing is uploaded

An audio merger joins several separate audio files into one continuous track. You add two or more files, put them in the order you want, and the tool stitches them end to end and returns a single MP3 — entirely inside your browser. You can mix formats freely: an MP3, a WAV recording, and an M4A voice note can all go into the same merge, because each file is decoded and re-encoded into one clean result. It accepts the formats people actually have — MP3, WAV, M4A, AAC, OGG, and FLAC — in any combination, and always returns a widely playable MP3. Because the work happens locally, your recordings never leave your device; voice notes, lecture parts, or song clips all stay on your own machine, and only the merged file is produced.

What this is and why it matters

Audio often arrives in pieces that belong together. A friend sends five separate WhatsApp voice notes that are really one story. A lecture was recorded in three parts because the phone stopped between sessions. A set of song clips, or a sequence of devotional segments, would be far easier to play as one continuous file than as a dozen separate ones. In each case the recordings are fine on their own — they just need to be joined, in the right order, into a single track you can keep, share, or play start to finish without tapping through a list.

This tool merges in the browser rather than on a server, for the same privacy reason as the rest of the toolkit. The clips people want to join are often personal — private voice notes, a recorded class, a family message — and uploading a whole batch of them to a website just to stick them together is slow and a privacy risk. Here every file is read into memory on your own device, joined locally, and handed back as one file. Nothing is transmitted and nothing is stored.

The merge handles mixed formats on purpose. Real collections are rarely all the same type — one file is an MP3 download, another a WAV recording, another an M4A voice note. Rather than forcing everything to match first, the tool decodes each file and re-encodes the joined result into a single 192 kbps MP3. That means you can drop in whatever you have, in any combination, and get back one clean, widely playable track — in exactly the order you arranged.

How to use this tool

Add your audio files. Drag them onto the drop zone above, or click to browse — either way, files are added to a list rather than replacing what is already there, so you can add a few, then add more. MP3, WAV, M4A, AAC, OGG, and FLAC are all accepted, in any mix. The combined size of all the files must stay under 500 MB. Nothing uploads — everything happens on your own machine.

Put them in order. The files merge top to bottom in the order shown. Use the up and down controls on each row to move a file earlier or later, and remove any file you did not mean to add. Take a moment to get the order right, because that is exactly how the final track will play.

Let the engine load on first use. The first time you merge, the tool downloads a one-time engine of about 30 MB into your browser. This happens only once — afterwards it is cached and later merges start immediately.

Merge and download. Once you have at least two files in the right order, press Merge and the tool joins them into a single MP3, showing a live percentage as it works. You can cancel at any time. When it finishes, it shows how many files were joined and the size, and offers the merged MP3 for download.

Examples and use cases

Joining several voice notes into one file

A Mumbai user received seven separate WhatsApp voice notes from a family member that together tell one long story. They add all seven, put them in the order they were sent, and merge them into a single MP3 they can save and replay in one go — without forwarding the batch to any website, since the voice notes stay on their phone.

Stitching a lecture recorded in parts

A Pune student recorded a two-hour class in three chunks because the phone paused between sessions. The parts are a mix of formats after being moved between apps. They add all three, order them correctly, and get one continuous recording to study from, with the mixed formats reconciled into a single clean MP3. Instead of opening three files and remembering which part came next, they have one track they can scrub through from start to finish, and the whole class stays on their own laptop.

Combining song or clip snippets

A Chennai user has several short audio clips they want to play back to back as one file for an event. They arrange the clips in the running order they need, merge them, and end up with a single MP3 they can hand to whoever is managing playback — no gaps to click through and nothing uploaded anywhere. One file is far less likely to be played out of order on the day than a folder full of separate clips.

Assembling devotional segments

A listener in Varanasi has a set of separate bhajan and shloka recordings and wants them as one continuous track for morning playback. They add the segments, order them the way they like to hear them, and merge them into a single MP3 that plays straight through — processed entirely on their own device, keeping the collection private.

Frequently asked questions

Are my audio files uploaded to a server?: No. The entire merge happens inside your browser. Every file you add is read into memory on your own device, joined locally by a WebAssembly build of FFmpeg, and the merged MP3 is handed straight back to you as a download — no byte of any file is ever sent to us or anyone else. This is especially valuable when the clips are private voice notes or recordings; they never leave your machine, and only the single merged file is produced. Close the tab and nothing is retained.
Can I mix different formats in one merge?: Yes — that is the whole point. You can combine MP3, WAV, M4A, AAC, OGG, and FLAC files in any mix within a single merge. The tool decodes each file and re-encodes the joined result, so it does not matter that your inputs started in different formats or at different sample rates. Whatever combination you add, you get back one clean, continuous 192 kbps MP3 that plays virtually everywhere.
What controls the order of the merged file?: You do. The files are joined in the exact order shown in the list, from top to bottom. Each row has up and down controls so you can move a file earlier or later, and you can remove any file you added by mistake. Whatever order you arrange before pressing Merge is exactly how the final track will play, so it is worth a quick check before you start.
Why does the merged file come out as one 192 kbps MP3?: MP3 at 192 kbps is the most universally compatible audio format — it plays on every phone, music app, and car stereo, and stays a reasonable size. Because the tool already decodes every input to join them, re-encoding the result to a single MP3 gives you one predictable, widely playable file regardless of what formats you started with. There are no settings to adjust; every merge produces the same dependable output.
Is there a limit on file size?: Yes — 500 MB for the combined size of all the files you add, not per file. Because every file is loaded into your browser tab’s memory together to be merged, the total has to fit comfortably, and very large batches would risk crashing the tab. Audio files are usually small, so in practice you can merge many of them before approaching the limit — and the running total is checked as you add files.