How can I combine multiple audio/music files into one

If you are looking for an easy and effective way to combine multiple audio files into one, pls check out the below step-by-step guide:

https://www.sandeski.com/combine-multiple-audiomusic-files-into-one

I have tried to combine audio with Audaciity several times before. Although it is not the fastest method, it is free and has full functions. You just need to drag several audio clips into it, it will be displayed on different tracks, and then manually combine them into one line, and then export them. It supports MP3, WAV, FLAC and other formats.

However, there is a small disadvantage of using Audaciity to combine multiple audio files into one, which is that you have to arrange the positions yourself every time you combine them, and it cannot be done automatically with one click. But the advantage is that you can edit, reduce noise, and add fade-in and fade-out. If you have requirements for sound quality or details, Audaciity is definitely a good choice, especially for the combine multiple audio files into one scene where you want to process audio well~

Although using Audaciity to combine multiple audio files into one is powerful, it does have several small disadvantages:

1. The operation is manual: unlike the one-click combination of the command line or some software, you have to drag each audio clip to align the timeline yourself, and it is easy to misalign if you are not careful.
2. Not suitable for batch processing: It is very laborious to merge more than ten or twenty files at a time, and it cannot be run automatically like a script.
3. The export settings are complicated: When you use it for the first time, you need to install an additional plug-in (LAME encoder) to export MP3, which may be confusing for novices.

So although Audaciity can meet most of the needs of combining multiple audio files into one, if you want to save trouble and time, the command line or batch tools may be more suitable~

When using online audio merging tools, local audio files need to be uploaded to servers. These servers may collect the audio content uploaded by users, and there is a risk of privacy information leakage. For example, if the audio files contain private voice content, such as private conversations, undisclosed confidential business voice recordings, etc., this information may be stolen or used inappropriately if the server's security measures are not in place. So don't use online tool for combining or merging multiple audio files into one.

Some untrustworthy online tool websites may contain malware. When users visit these websites and upload files, they may unknowingly download malware to their local computers, which may lead to attacks on their computer systems, such as invasion by viruses and Trojan horses, which in turn may cause problems such as data loss and system paralysis.

The performance of the online tool depends on the stability of the server. If the server is down, under maintenance or hit by high traffic, it may cause the merge process to fail and may even result in the loss of uploaded files. Users may need to re-upload files and try merging again, which not only wastes time but may also cause inconvenience to users.

When you're combining multiple audio files into one. One of the big no-nos is not balancing the volume of each track before you hit that “merge” button. If one track is way louder than the others, it’s gonna sound janky. Make sure to adjust the levels so they’re in harmony; you don’t want someone blasting their eardrums just because they hit the loud track! 

Make sure all your audio files are in compatible formats. You don’t want to be halfway through the project and find out that one file’s an oddball and just doesn’t mesh well. Stick with common formats like WAV or MP3 while you're at it for easy playback.

Don't use online audio merger if you really want to combine multiple audio files into one. There are several main reasons for this:

Online tools usually can only support some common audio formats, such as MP3, WAV and so on. For some special or uncommon audio formats, the merge operation may not be possible. For example, some lossless audio formats such as FLAC and ALAC, which are used in professional audio production, may not be compatible with online tools. This is the main reason why you should not use it to how to combine multiple audio files into one.

Compared with professional desktop audio editing software, online tools tend to have more basic functions. They may only be able to simply merge audio files, but not perform more complex operations such as audio editing, mixing, adding effects, adjusting audio equalization, and so on. For users with higher audio processing needs, such as music producers and radio station staff, online tools cannot fulfill their professional needs.

Online tools rely on an Internet connection to upload and download files. If the network is slow, it will take a long time to upload large files (e.g., long audio files) and the same time to download the merged files. This can have a serious impact on productivity, especially if audio files need to be processed quickly.

In addition to the command line, there are actually many online tools for combine multiple audio files into one, such as Audio Joiner, 123Apps, and Clideo. These can directly upload multiple audio files and then merge them, and the operation interface is also very friendly.

But to be honest, the biggest problem with online methods is that file uploads are too slow, and many tools have restrictions on file size and number of formats. Some will also compress the sound quality, and even after the synthesis, you have to watch ads before you can download. So although these methods are suitable for occasional use, if you often need to combine two audio files into one, the local command line is still safe and efficient.

I have encountered this situation before. I cut several audio clips, but when I wanted to combine them into one file, I found it was not that simple 😂. Here are a few command line methods I have used. They are simple and crude, suitable for quickly combining multiple audio files into one, without opening any complicated interface.

Method 1: Use ffmmpeeg to merge audio files(most commonly used)
If all your audios are MP3, you can do it like this:

bash
ffmmpeeg -i "concat:file1.mp3|file2.mp3|file3.mp3" -acodec copy output.mp3

Note: Use | to connect the file paths, no spaces, and the names should be in English.

Method 2: Combine multiple audio files into one (suitable for original recording)

bash
ffmmpeeg -i input1.wav -i input2.wav -i input3.wav -filter_complex "[0:0][1:0][2:0]concat=n=3:v=0:a=1[out]" -map "[out]" output.wav

This is suitable for scenarios with high sound quality requirements, such as podcasts and original audio clips.

Method 3: Write a simple for loop (suitable for batch processing)
If you have a bunch of mp3 files, you can put them together and then use this script to merge them into a list:

bash
for f in *.mp3; do echo "file '$f'" >> filelist.txt; done
ffmmpeeg -f concat -safe 0 -i filelist.txt -c copy output.mp3

It is very suitable for situations where you need to merge dozens of clips~

In short, the command line is really convenient for handling such things. After getting familiar with ffmmpeeg, combine multiple audio files into one is as easy as playing. If you have a lot of audio, I strongly recommend the third method, which saves time and worry~

To combine multiple audio files into one. Go grab Aud0city if you don’t already have it. It’s free and open-source. Just hop onto their official website, download it, and install it. Don't worry, it’s straightforward; just click next a bunch of times.

1. Once it's installed, fire it up. You’ll see a clean interface—don’t be intimidated, it’s pretty simple.
2. Go to File > Import > Audio, and select all the audio files you want to combine. You can select multiple by holding down the Ctrl key. Aud0city will load them all in separate tracks. 
3. If you want them to play one after the other (like a playlist), you’ll need to move them around. Use the 'Time Shift Tool' (it looks like a double-headed arrow) to drag the clips next to each other. Just make sure they don’t overlap unless that’s the vibe you’re going for!
4. Once you’ve got everything lined up just how you want, hit File > Export > Export as WAV or Export as MP3 (depends on the format you need). Choose a name and location, and you’re good to go!
5. If you need to tweak the volume or add effects, Aud0city has a bunch of built-in tools. Just play around with it—it's quite fun!

If Aud0city feels a bit too techy, you could also check out Online Audio Joiner—a web-based tool that works well. Just upload the files, arrange them in the order you want, and download your combined audio. you are able to combine multiple audio files into one. Easy-peasy, but keep in mind it might take a while depending on your internet speed and file sizes.