Top Free MP4 Joiner Software Review [with How-to Guide]

It can be annoying to merge MP4 files into one. Some MP4 joiner software distorts video image, some outputs audio that is completely out of sync for the video or strips the audio out.

By Candice Liu ｜Last updated on Jan 28, 2021

I have 4 x .mp4 files that I need to join together (preferably without re-encoding, but I will if I have to) and I have tried several MP4 joiner programs without success. I thought this would have been pretty simple to do - but apparently 'nothing' is simple! The problem is - although there are no artifacts in the source material and I have edited and cut to ensure seemless joins, each MP4 merger somehow duplicates a frame or two at each point of joining and as such - not only do I get a huge amount of picture distortion and the resulting audio is completely out of sync for the remainder/duration of the video?Appreciate any help or insight.Thanks. -- from VideoHelp

If the MP4 files you want to join together are not exactly the same in resolution, codec, screen size etc. some MP4 joiner programs have to re-encode MP4 video/movie first and it may take a few hours to combine MP4 files. Here we review top MP4 joiner software without re-encoding for users who need to join MP4 video file quickly without reducing original quality.

No. 1 The Fastest MP4 Joiner without Re-encoding - MacX Video Converter Pro

MacX Video Converter Pro is the fastest MP4 joiner software on the list, which can merge multiple MP4 videos into one in seconds thanks to HT and QSV acceleration. MP4 files you join can be in different resolution (4K UHD and 8K also supported), codecs, screen size etc. needless of manually re-encoding. The MP4 merger's built in High Quality Engine guarantees original quality. It supports to combine MP4, AVI, WMV, MKV, FLV, M2TS, AVCHD etc. any formats videos movies together. The multifunctional MP4 joiner can be also used to split, trim, crop video and add watermark/subtitles to videos, download MP4 videos movies and do other video MP4 editing jobs.

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How to quickly join MP4 files needless of re-encoding

No complicated MP4 merging process. The MP4 joiner is very simple to use. Before you get started, free download the MP4 merger for macOS (macOS Sierral also incl.) or for Windows and run it, and follow steps below to learn how to quickly join separate MP4 video or movie file together with high quality without re-encoding.

Step 1: Click "Add File" icon on top-left corner and select MP4 files you want to join, the MP4 joiner will load files immediately.

Step 2: Switch the Merge All button to "ON" to activate the MP4 merger software and continue.

Step 3: Click "RUN" to process MP4 file merging with the MP4 joiner. It also works as an MP4 video splitter, editor, downloader and converter.

No.2 Free Online MP4 Joiner - aconvert

Aconvert is an online MP4 joiner that can join MP4 files from local drive or online. It requires no register like other online MP4 editor software, and it's free to use. The online free MP4 video merger can also combine AVI, FLV, MKV, M2TS, ASF, MOV, VOB etc. But the maximum file size is 200MB. The MP4 video files you want to join must have the same resolution, frame rate, screen size etc. Like other online MP4 joiner, the application is brimming with misleading ads. Learn how to use the free online MP4 joiner to do the video merging job below.

How to merge MP4 video file online with the same dimensions

Step 1: Head to the MP4 converter & joiner page. Click "Choose File" to select MP4 file from local drive. The MP4 joiner also supports to join online file URL.

Step 2: Click "Submit" to start to process the free MP4 file joiner. You can only submit video file one by one, and the latest video file the MP4 merger tool creates is the merged one. Note that the file size is limited to 200MB.

Step 3: On the Output Results section, click download icon below ACTION and save the merged MP4 file to Dropbox or save to Google Drive. Don't click the big green "START DOWNLOAD" icon, which is also advertisement. The free online MP4 joiner can do few editing job, learn how to add subtitle to MP4 if you need.

No.3 MP4 Merger Freeware - Format Factory

Format Factory is a multifunctional MP4 editor that can also work as an MP4 video joiner. It allows users to merge multiple MP4 files into one with options to adjust video quality and codec. The output quality is OK. Format Factory is an ads-supported MP4 joiner freeware, so, keep your eyes open while downloading and installing it. The interface design of the MP4 merger free software is not very user friendly, making it not easy for novice users to get started. Read our guide below to learn how to use the free MP4 joiner to join several MP4 file together.

How to use the MP4 joiner freeware

Step 1: download and install the MP4 merger freeware. You can uncheck the "Install Format Factory to system menu" and "Install Picosmos Picture Tools" box during the free MP4 joiner installation process.

Step 2: Click "Utilities" and you'll see "Video Joiner" section. Click on "Video Joiner" to enter the MP4 video combination interface.

Step 3: Click "Add File" under "Source File List" category and select MP4 file to merge, and click "OK".
The Output Setting part gives options to choose format, quality and size.

Step 4: Click the red "Start" button to process MP4 file joining.

Tags: Video convert MP4

ABOUT THE AUTHOR

Candice Liu

Candice's particularly skilled in writing and sharing video-related contents. Her guides cover from deep-seated video/audio parameters, to media entertainment on different platforms. She also enjoys shooting and processing videos by herself for a more reliable basis of informative info with her articles, which are never at the expense of eliminating an entertaining read.

2021 top MP4 Joiner Software without Re-encoding