After ripping several separate ISO video files from DVD, you might want to combine them together for watching without pausing. How to combine ISO files into a non-step one? To do it, a video joiner is required. But you should know that not all video joiner software can do well with ISO format. For giving a helping hand, below collect 2 professional and practical ISO video joiners.

Part 1. How to Combine ISO Files with Joyoshare Video Joiner
Joyoshare Video Joiner (https://www.joyoshare.com/video-joiner/) is an overall and fast video joiner that supports a wide variety of file formats, such as ISO, VOB, MP4, MKV, DVD, WMV, AVI, M4A, M4V, OGG, etc.
Not only that, but it also transfers video/audio files to various formats and even converts them to be compatible with many devices. What else makes it gain popularity is the poweful and advanced merging features. With the help of it, losslessly joining unlimited files into one and customizing files with cool effects will be a breeze.

Steps to combine ISO files by Joyoshare Video Joiner: 
Step 1: Run Joyoshare Video Joiner and add ISO files
The first thing to do is finishing the installation of Joyoshare Video Joiner on your computer. Next, it is time to add your ISO files. The program offers two ways to do it. One is simply dragging files to the designated position. The other one is to hit on "Open File" to choose them from your local files.

Step 2: Select a mode to merge ISO files
After inputing ISO files to the program, then you should tap on "Format" to choose a merging mode and an output format. To join ISO files with original quality, please pick the high-speed mode. Suppose these files need to be edited, just choose the encoding mode. By the way, users selecting the encoding mode have the right to customize the output format by clicking a gear icon.

Step 3: Cut ISO files
When returning to the first interface, you could preview these video files. If you find something unpleasant, just move the timeline to remove it. Besides, renaming and rearranging files are allowed at this time.

Step 4: Edit ISO files
This step is not for every user but for those who merge files using the encoding mode. If you are one of them, now you can press on "Edit" to customize your ISO files. For example, you are allowed to trim/rotate them, adjust aspect ratio, add visual effects, insert subtitles and unique watermarks, and more.

Step 5: Combine ISO files
The last thing to do is just touching the "Convert" button. Then Joyoshare Video Joiner will start merging your ISO files. Once done, the merged ISO file can be found in the local file.

Part 2. How to Combine ISO Files with Kate's Video Joiner 
Kate's Video Joiner is a free and simple-to-use joining program only available for Windows. It is designed to join multiple video files of same and different formats into a single video. What's more, it well supports a range of formats covering DVD, AVI, WMV, MOV, DIVX, 3GP, and many others. Of course, a visualized interface also characterizes it. For beginners to combine ISO files, Kate's Video Joiner is a great choice with the exception of Joyoshare Video Joiner.

Step 1: Firstly, you need to download and install Kate's Video Joiner on the computer and then to open it;
Step 2: Afterward, import your ISO files by clicking the "Add" button;
Step 3: Once all ISO files are uploaded, rearrange your ISO files as you like and then select an output format. To set up video quality, go to "Advanced";
Step 4: Finally, tap on "Join". In a moment, your ISO files are merged losslessly and seamlessly.
Note: Although come with a "Preview" button, it has no built-in media player. You need to load preview in an external player.