How to merge audio files in 3 steps
- 01
Add your clips
Open file, drag in multiple files, or click Try a demo, adding up to 50 clips to the track list. Reorder them with move up and move down, or remove any clip you do not want.
- 02
Set transitions and levels
Pick a transition for each gap: crossfade 0 to 10 seconds with an equal-power or linear curve, or a silent gap 0 to 10 seconds. Adjust per-clip gain up to plus or minus 12 dB, and turn on loudness matching to even out clips recorded at different volumes.
- 03
Render and download
Click Render preview to hear the merged result, use A/B to compare Original/Processed, then Download audio. Everything is combined into a single exported file.
What you can do with this audio joiner
- Merge up to 50 clips into a single output file.
- Reorder clips with move up and move down, or remove any clip before rendering.
- Set per-clip gain up to plus or minus 12 dB to balance levels between clips before they are joined.
- Choose crossfade, 0 to 10 seconds, with an equal-power or linear curve, or a silent gap, 0 to 10 seconds, between any pair of clips.
- Turn on optional loudness matching to bring clips to a consistent −16 LUFS before merging.
- Combine clips recorded at different sample rates; mixed sample rates are handled automatically.
- Works entirely on your device. Files are never uploaded, and there is no account or watermark.
- Send the merged file straight to another tool with Continue in another tool instead of exporting and re-uploading it.
What is an audio joiner?
An audio joiner takes several separate audio files and combines them, in order, into one continuous file. This audio joiner does that locally in your browser: add up to 50 clips, arrange them the way you want, choose how each pair connects, and export a single file, with no upload and no software to install.
It is built for the common case of stitching real recordings together, whether that is combining MP3 files from separate sessions, joining voice memos, or assembling a longer track out of shorter pieces.
Join vs mix: what this tool actually does
It is worth being precise about the difference. Joining, what this tool does, places clips one after another on a single timeline, so clip one finishes (or crossfades) before clip two begins. Mixing is a different job entirely: overlaying multiple tracks so they all play back at the same time, layered on top of each other, the way a multitrack recording combines vocals, drums, and instruments simultaneously.
A crossfade briefly overlaps the end of one clip with the start of the next, but that is a short transition, not ongoing simultaneous playback. If what you actually need is several tracks playing together at once rather than one after another, an audio joiner is not the right tool for that job.
Crossfade vs a silent gap: choosing a transition
Between any two clips, you can choose a crossfade or a silent gap, each from 0 to 10 seconds. A crossfade overlaps the outgoing clip fading out with the incoming clip fading in, which smooths over an abrupt cut, useful for music or ambient recordings. A silent gap simply inserts quiet space between clips instead, which usually reads better for spoken content, like separate podcast segments or audiobook chapters, where you want a clean pause rather than a blend.
| Crossfade curve | How it behaves | When to use it |
|---|---|---|
| Equal-power | Curved gain ramps keep the combined perceived loudness roughly constant through the transition | Music, and most general-purpose crossfades |
| Linear | Straight-line fade in and fade out, which can create a slight dip in perceived loudness mid-transition | Simpler, more predictable fades, or matching a specific edit style |
Per-clip gain, loudness matching, and mixed sample rates
Recordings rarely arrive at the same volume. Per-clip gain, up to plus or minus 12 dB, lets you nudge an individual clip louder or quieter before it is joined to the others, which is often enough on its own for a couple of mismatched clips.
For a longer sequence, turn on loudness matching instead, which brings every clip to a consistent integrated loudness of −16 LUFS before merging, rather than adjusting each one by ear. This target is fixed rather than adjustable, so if you need a different final loudness for a specific platform, run the merged file through volume booster afterward with a custom target.
You also do not need to match sample rates yourself beforehand. If your clips were recorded at different rates, this tool handles that automatically as part of the merge.
Use cases for merging audio
Merging audio comes up in a handful of recurring situations, and the right settings differ a bit depending on which one you are in.
- Podcast segments: join an intro, interview, and outro recorded separately, using a silent gap or a short crossfade and loudness matching so segments recorded on different days sound consistent.
- Playlists and DJ-style mixes: crossfade between tracks with the equal-power curve for smoother, more natural-sounding transitions between songs.
- Audiobook chapters: combine chapter recordings in order with a silent gap between them, so listeners get a clean pause rather than a musical blend.
- Voice memos: stitch together multiple short recordings into one file, using per-clip gain to even out volume differences between takes.
What to expect when merging audio
This tool exports a single output file per merge, so if you need several different combinations of the same clips, you will run it more than once. It supports up to 50 clips per project, and while mixed sample rates are handled automatically, very large numbers of long clips will take longer to render and use more of your device's memory, particularly on mobile.
Since this is a joiner, not a multitrack mixer, keep in mind that clips play one after another rather than simultaneously, aside from the brief overlap during a crossfade.
Tips for merging audio
- Use a silent gap for spoken content like podcast segments or audiobook chapters, and reserve crossfades for music or ambient transitions.
- Try the equal-power crossfade curve first; it tends to sound more natural than linear because it avoids a dip in perceived loudness mid-transition.
- Turn on loudness matching whenever you are combining clips recorded in different sessions or on different devices, rather than adjusting per-clip gain by ear for every clip.
- Trim silence or mistakes off the start and end of a clip with the audio trimmer before adding it to the joiner, since transitions look and sound cleaner on tight clips.
- If your target platform expects a specific loudness, such as −14 LUFS for streaming, run the merged file through volume booster afterward rather than relying on the joiner's fixed −16 LUFS target.
- Reorder clips before you fine-tune transitions; moving a clip after you've set its crossfade can change which gap that setting applies to.
Frequently asked questions
How do I merge audio files online for free?
Add up to 50 clips with Open file, drag and drop, or Try a demo, arrange them with move up and move down, choose a crossfade or silent gap between clips, then click Render preview and Download audio.
Can I combine MP3 files without losing quality?
The join itself does not add extra generational loss beyond what's inherent in re-encoding to your chosen output format. Choosing a lossless output like WAV or FLAC avoids adding any further lossy compression on top of your source clips.
Can I merge different audio formats together?
Yes. You can add clips in different formats to the same project; they are combined and exported as one file in your chosen output format.
Are my files uploaded to a server?
No. Merging happens locally in your browser. Your clips are never uploaded.
What is crossfade and should I use it?
Crossfade overlaps the end of one clip fading out with the start of the next fading in, over 0 to 10 seconds, with an equal-power or linear curve. Use it for smoother musical transitions; use a silent gap instead for spoken content like podcasts or audiobooks.
How many files can I merge at once?
Up to 50 clips in a single project, exported as one file.
What's the difference between equal-power and linear crossfade?
Equal-power uses curved gain ramps so the combined perceived loudness stays roughly constant through the transition. Linear uses a straight-line fade, which can create a slight dip in loudness partway through. Equal-power generally sounds more natural for music.
Can I trim clips before merging them?
Not within the joiner itself. Trim a clip's start or end first with the audio trimmer, then add the trimmed file to the joiner.
Does merging audio files reduce quality?
Merging itself does not discard quality beyond what your chosen output format implies. Export as WAV or FLAC for a lossless result, or MP3 or another lossy format if smaller file size matters more.
Can I merge audio files on my phone?
Yes, it works in mobile browsers, though a large number of long clips can be slower to render and use more memory on a phone than on a desktop.
How do I combine songs into one file for a playlist or DJ-style mix?
Add your tracks in the order you want them played, choose crossfade with the equal-power curve for smooth transitions, then render and download the merged file.
Can I add silence between tracks instead of a crossfade?
Yes. Choose the silent gap transition, from 0 to 10 seconds, for any pair of clips instead of a crossfade.
Is there a limit on file size?
Each clip follows the general 150 MB per-file limit. With up to 50 clips in a project, total memory use depends on your device, and very large projects may run slower on lower-memory hardware.
Can I loudness match my clips before merging?
Yes. Turn on optional loudness matching to bring every clip to a consistent integrated loudness of −16 LUFS before they are joined, which is useful when clips were recorded at noticeably different volumes.