Audio Merger
Combine multiple audio clips into one file
Your files are processed on your device. The first use downloads a processing engine, which your browser then keeps.
Drop audio files to mergeTap to choose audio files to merge
or click to browseor tap to choose
Combine multiple audio clips
Large files (over 500 MB) may take longer or run out of browser memory
About Audio Merger
Combines two or more audio clips into a single file, played back to back in the order you set. You can leave a gap of silence between clips or crossfade them, up to 5 seconds. Runs entirely in your browser — your audio never leaves your device.
Upload your audio clips, then drag them (or use the arrows) into the order you want them to play. Each clip shows its length and sample rate. Choose a gap of silence or a crossfade between clips (they are alternatives), then merge and listen to the result before you download. Merging and listening cost nothing; a trial use is taken only when you download.
Clips are re-encoded during merging (the output format defaults to the first clip's, at its bitrate), so mixing different source formats (like an MP3 and a WAV) won't break the merge. Clips recorded at different sample rates are all brought to the first clip's rate, and a note says which ones were. A crossfade is shortened where a clip is too short for it. The size limit applies to all clips added together, not each one separately.
Watch: Audio Merger in Action
- When is a trial use taken for merging audio?
- When you download the merged file, not when you press Merge Audio. Merging and listening to the result cost nothing, a merge that fails costs nothing, and downloading the same result again in the same visit does not take another use.
- Can I merge audio files that are in different formats?
- Yes — clips are re-encoded to a consistent format during merging, so mixing different source formats (like an MP3 and a WAV) won't break the merge.
- Can I merge an MP3 and a WAV into one file?
- Yes. Each clip is decoded on its own and the joined result is encoded once into the format you pick in Output format, so mixed sources are fine. Leave it on Same as first file to follow the top clip, or choose MP3, WAV, OGG, M4A or FLAC explicitly.
- How is the quality of the merged file decided?
- For MP3, OGG and M4A output, the bitrate is estimated from the first clip's file size and length and rounded down to a standard step, so it never exceeds that clip. If the first clip is WAV or FLAC and you choose a lossy format, 192 kbps is used. WAV and FLAC are lossless.
- How do I add a pause between clips?
- Use Gap between clips: none, 0.25, 0.5, 1, 2, 3 or 5 seconds. The silence is added after every clip except the last one, and the Total length line includes it. You cannot set a different pause for each junction.
- Can I crossfade between clips?
- Yes. Crossfade between clips (up to 5 seconds) overlaps the end of each clip with the start of the next using an equal-power curve, so the merged file is shorter by the overlap: two 1 s clips with a 0.5 s crossfade make 1.5 s. A crossfade is never longer than half of either clip, so a short clip shortens it, and a note says so. A gap and a crossfade are alternatives; choosing one clears the other.
- Can I change the order by dragging?
- Yes. Drag a row by its grip (mouse, finger or pen), or use the Move up and Move down buttons, which also work from the keyboard. The list order is the playing order, and every row shows its length and sample rate.
- Will clips with different sample rates play at the right speed?
- Yes. All clips are brought to the first clip's sample rate, so none is played at the wrong speed or pitch, and a note names each clip that was resampled, for example 2nd clip resampled 48 → 44.1 kHz. Put the clip whose rate matters first.
- Why is the Merge Audio button disabled?
- It needs at least two files in the list, it is disabled while a merge is running, and it is also blocked when the combined size is over the allowed limit, in which case a notice under the list explains it. Add another clip or remove a large one.
- What will the downloaded file be called?
- The name says what it is: merged-2-clips.mp3 for two clips, merged-5-clips.wav for five, with the extension of the chosen output format, so it never looks like one of your own files.
How to use Audio Merger
Drop two or more audio files on the drop zone, or add more later; a file with the same name, size and date as one already listed is skipped. Each row shows its length and size. Drag a row by its grip, or use the up and down buttons beside it, to move that clip earlier or later, because the list order is the playing order; the X removes it.
Below the list, set a Gap between clips or a Crossfade of up to 5 seconds (they are alternatives), then open Output format and choose Same as first file, MP3, WAV, OGG, M4A or FLAC. Once every length is known a Total length line appears, gaps included. Press Merge Audio, listen in the preview, and use the download button. Merge Audio stays greyed out until at least two files are listed.
When to use it
Use it when a podcast or lecture was recorded in separate takes and you want one file, when you are joining an intro, a main section and an outro, or when voice memos from one day should become a single recording. The gap buttons help with spoken clips that need a breath between them, such as language-practice phrases or audiobook chapters.
When not to use it
This joins clips one after another, so it cannot lay a music bed under a voice or overlap two tracks; a multitrack editor such as Audacity does that. It can crossfade neighbouring clips, but only by one length for every join. If you only need to remove a section from one recording, the Audio Trimmer is the simpler route.
Tips for best results
The first file in the list sets the default format and the bitrate, so put the clip whose quality you care about at the top. For MP3, OGG or M4A output the bitrate follows the first clip's own rate but never goes above it, which avoids pointlessly large files. Check the Total length line before merging; if a clip shows no length, its duration could not be read by your browser. Merging costs nothing and you can listen to the result first; a trial use is taken only when you download the merged file.
Limitations
Every merge re-encodes the audio, even when input and output formats match, so lossy sources lose a little quality each time. Only a handful of gap and crossfade values are offered and the same one goes between every pair of clips. Clips with different sample rates are all brought to the first clip's rate. All clips are held in memory together, so a long list of big files can fail on a phone or older laptop, and a notice appears when the combined size is too large.
Privacy
Your clips are read into browser memory and joined by an audio engine in a background worker, so nothing is sent to a server. The one outside request is the engine itself, about 25 MB, fetched from the jsDelivr public CDN the first time you merge. The engine is shut down after each merge, and the result stays on the page until you download it.
Next: Audio Converter
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