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17 June 2019  John Weaver  Senior Program Developer
Last update by Olivia Brown at 9 November 2026

Summary
It is common to join several MP3 files into one when we try to edit audio files. How to join MP3 files on Windows and MacOS? The essay will tell you the free MP3 mergers.



process of mp3 merger

Part 1: Join MP3 Files by Copy Command (On Windows)

Command Prompt is a powerful Windows tool. We can take it as a MP3 merger by ordering command lines. Here are the steps:
① Open Command Prompt. Press [Win + R] to open Run. Then, type [cmd] to run Command Prompt.
press win and r to run cmd
② In Command Prompt, type and run the command line [copy /b “f:Renee1.mp3” + “f:Renee2.mp3” “f:Renee.mp3”].
use command prompt to copy and merge mp3
③ After that, these MP3 files will be merged into one.
merge audio files through command prompet
TipsThe command “copy/b” should follow the sources, names, formats of the original files separated by “+”. Then, you should define the source, name and format for the new file.

Part 2: Join MP3 Files by Renee Audio Tools (On Windows)

Renee Audio Tools is free software for audio editing. It is not only a MP3 merger but also it can join pieces of music together, convert audio formats, burn audio files to a CD or DVD, and edit, split, record and cut audio files.
Renee Video Editor – Multi-function Video Editing SoftwareRenee Video Editor professional video edit tools

Separate videos with different parametersUsers can separate videos into equal clips by time, size and self-set parameter.

Cut Videos & AudiosUsers are free to cut videos and audios clips by setting start and end time.

Multiple Edit ToolsMerge, crop, rotate, cut and transform video easily. Change and add background music, subtitles and watermark to video.

Format ConversionSupport to convert videos and audios into different formats.

Separate videosSeparate videos into equal clips by time, size and self-set parameter.

Cut Videos & AudiosCut videos and audios clips by setting start and end time.

Format ConversionConvert videos and audios into different formats.

Free TrialFree TrialDownload

32321 users have downloaded and used Renee Video Editor!

① Open Renee Audio Tools and select [Joiner].
select the function joiner in renee audio tools
② Click [Add Files] to select the target MP3 files.
add mp3 files in renee audio tools
③ In the function [Cut], cut the unnecessary parts of the audios.
cut the audio in renee audio tools
④ Check the option [Merge all into one]. Click [Start] to produce after selecting the output format, quality and output folder.
merge all music files into one in renee audio cutter

Part 3: Join MP3 Files by CAT Command (On MacOS)

On Mac, CAT command can be a MP3 merger, too. Here are details:
① Go to [Launchpad] > [Other] > [Terminal].
go to the application terminal on mac
② Type and run the command [cat Renee1.mp3 Renee2.mp3 > Renee.mp3], shown as below:
run cat command on mac to merge mp3 files
③ As it is finished, go to the output folder and check the file.
check mp3 files after the operation of cat merger

Part 4: Join MP3 Files by Renee Video Editor (On MacOS)

TipsRenee Video Editor is multi-functional software for video editing. It can cut, split, rotate, merge, and add/remove background music, subtitles and special effects. Besides, it can edit audio files, such as converting, cutting and merging.
 
① Open Renee Video Editor and select the function [Joinner].
click joiner in renee video editor on mac
② Click [Add File] to select the target MP3 files.
add audio files in renee video editor on mac
③ In the option Output Format, click [Audio] > [MP3]. Then, click [Start] to merge the MP3 files.
merge sand save mp3 audio in renee video editor on mac
Renee Video Editor – Multi-function Video Editing SoftwareRenee Video Editor professional video edit tools

Separate videos with different parametersUsers can separate videos into equal clips by time, size and self-set parameter.

Cut Videos & AudiosUsers are free to cut videos and audios clips by setting start and end time.

Multiple Edit ToolsMerge, crop, rotate, cut and transform video easily. Change and add background music, subtitles and watermark to video.

Format ConversionSupport to convert videos and audios into different formats.

Separate videosSeparate videos into equal clips by time, size and self-set parameter.

Cut Videos & AudiosCut videos and audios clips by setting start and end time.

Format ConversionConvert videos and audios into different formats.

Free TrialFree TrialDownload

32321 users have downloaded and used Renee Video Editor!

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