ISO to MKV: How to Convert or Remux DVD ISO Files to MKV

An ISO image keeps the structure of a DVD in one large file, which is useful for backup but not always convenient for direct playback on TVs, media servers, phones, or apps. Converting the movie titles inside an ISO to MKV can make the content easier to manage while still allowing multiple audio and subtitle tracks in one file.

This guide covers two practical approaches: use WonderFox DVD Ripper Pro when you want a straightforward Windows workflow with format, size, and device options; or use MakeMKV when you want to remux the original streams to MKV without re-encoding.

Legal note: Copyright and copy-protection laws vary by country and region. Convert or back up only content you are authorized to use, and check the rules that apply where you live.

Method 1: Convert DVD ISO to MKV with WonderFox DVD Ripper Pro

WonderFox DVD Ripper Pro is designed for DVD video sources on Windows. It analyzes the titles in a DVD ISO, normally selects the main movie automatically, and lets you convert it to MKV or another playback-friendly format. Because this method can re-encode the video depending on the selected profile and settings, the output size and quality can be adjusted instead of being locked to the source.

Convert DVD ISO to MKV with flexible output options

WonderFox DVD Ripper Pro can open DVD discs, ISO images, and VIDEO_TS folders, then convert the movie to MKV and other common formats. It is a practical choice when you want easier playback, a smaller file, or control over video, audio, subtitles, and output settings.

Three Steps to Convert ISO to MKV

Preparation: Downloaded Downloaded and install WonderFox DVD Ripper Pro on your Windows PC.

Step 1: Load the DVD ISO File

Launch WonderFox DVD Ripper Pro. The interface provides three source options: DVD Disc, ISO Image, and DVD Folder. Click ISO Image, browse to your .iso file, and open it. The program will analyze the disc structure, list the available title information, and select the main movie automatically.

Step 2: Choose MKV and Check the Tracks

Open the Output Format panel and choose MKV under Video category. Then check the audio and subtitle options you want to keep. If your goal is to reduce the file size or improve compatibility, you can also click Settings to adjust the video and audio parameters.

Step 3: Start the Conversion

Choose an output folder at the bottom and click Run to start converting the selected DVD title to MKV.

Processing time depends on the source length, output settings, storage speed, and your computer. MKV is better suited to storing individual movie or episode titles for playback.

Related: DVD to ISO | Video_TS to MKV | DVD to MKV

For multi-gigabyte DVD ISO files, a desktop tool is generally more practical. WonderFox DVD Ripper Pro also gives you control over output size and compatibility, which is useful when the original DVD streams are not ideal for the device or app you want to use.

Method 2: Remux ISO to MKV with MakeMKV Without Re-encoding

If your priority is to keep the original video and audio quality, MakeMKV takes a different approach. Instead of encoding the movie again, it places the selected streams from the DVD into an MKV container. This preserves the original video and audio streams, chapters, and track metadata that MakeMKV can read. The tradeoff is file size: because there is no video compression step, the resulting MKV can remain several gigabytes.

MakeMKV is available for Windows and macOS, while Linux builds are provided through its forum. The following workflow also applies when the source is an ISO image.

Step 1: Install and Open MakeMKV

Download MakeMKV from the official MakeMKV website and install it. The current beta is time-limited, so check the official download page or forum for the latest release and current beta registration key instead of relying on an old or expired one.

Step 2: Open the ISO Image

In MakeMKV, go to File > Open files, choose the DVD ISO, and wait while the program scans the image. When the scan finishes, MakeMKV displays the titles and the video, audio, subtitle, and chapter information it can preserve.

Step 3: Select Titles, Audio, and Subtitles

Choose the main movie and extras you actually want. Expand a title to review its audio and subtitle tracks, then uncheck those you do not need. For a TV-series ISO, multiple episodes may appear as separate titles.

Step 4: Make the MKV File

Choose an output folder and click Make MKV. MakeMKV copies the selected streams into one or more MKV files without re-encoding them. This avoids generation loss, but it does not make a complete disc-image backup and normally does not preserve interactive DVD menus inside the MKV.

WonderFox DVD Ripper Pro vs. MakeMKV

Both tools can turn the movie content inside an ISO into MKV, but they solve different problems:

Choose WonderFox DVD Ripper Pro if you use Windows and want to convert the ISO to a smaller or more compatible MKV, change codec/resolution settings, or prepare the video for a particular device or playback environment.

Choose MakeMKV if you want a straightforward remux that keeps the original video/audio streams and selected tracks with no video re-encoding. It is also available on macOS and Linux.

Keep the ISO instead if you need an image-style backup that retains the complete disc structure and menus. An MKV is primarily a container for playable titles, not a full replacement for the original disc image.

FAQs

Q1. Does converting ISO to MKV lose quality?

It depends on the method. MakeMKV remuxes the original streams without video re-encoding, so there is no quality loss caused by transcoding but with a large output file size. WonderFox DVD Ripper Pro can re-encode the video to reduce size or change compatibility; in that case, quality depends on the codec, bitrate, resolution, and other output settings.

Q2. Why is my MakeMKV file almost as large as the ISO?

That is normal when you keep the main title at its original quality. MakeMKV does not compress the video. The MKV may be smaller than the ISO if you exclude menus, extras, unwanted titles, audio tracks, or subtitles, but substantial size reduction requires re-encoding with a converter.

Q3. What if MakeMKV cannot open the ISO?

First make sure the ISO is complete and not corrupted, then update MakeMKV to the latest release. If the image comes from a protected disc, support can vary with the disc and the MakeMKV version. You can also test whether the ISO mounts and plays correctly before attempting another rip.

Q4. Can I convert multiple ISO files in batch?

Unfortunately, neither MakeMKV nor WonderFox DVD Ripper Pro supports batch conversion. You'll need to convert each ISO file one at a time.

Why MKV Works Well for DVD Video

1. Multiple Audio and Subtitle Tracks

MKV can store several audio and subtitle streams in the same file, which is useful for multilingual discs, commentary tracks, and forced subtitles. Whether every original track is kept depends on what you select in the ripping software.

2. Chapters and Track Metadata

MKV can carry chapter information and useful metadata such as track language and audio type. Tools such as MakeMKV are designed to preserve this information when it is available in the source.

3. Broad Playback and Media-Server Support

MKV is widely supported by desktop players and media-server software. Device support still depends on the codecs stored inside the MKV, so a device can support the MKV container yet fail to decode a particular video or audio format.

4. Flexible Balance Between Quality and File Size

MKV itself does not determine quality or file size. A MakeMKV remux can stay close to the source size because the video is not re-encoded. A converter such as WonderFox DVD Ripper Pro can create a smaller MKV by re-encoding with different video and audio settings. Choose the workflow based on whether original quality or storage efficiency matters more to you.

Wrap-up

In short, use MakeMKV when you want a no-re-encode MKV that stays close to the original disc streams, and use WonderFox DVD Ripper Pro when you want more control over compression, output settings, and playback compatibility. If you need the full disc structure and menus, keep the ISO or make a 1:1 backup instead.

Kevincy Berel

Kevincy joined the WonderFox team in 2014 and has been a senior columnist ever since. With over two decades of experience in the video editing industry, he shares tutorials, tips, and how-to guides on video/audio processing and personal DVD backups. Family-oriented and passionate about helping others, he is dedicated to making video and audio processing easier for readers.

More Special Features of WonderFox DVD Ripper Pro

WonderFox DVD Ripper Pro

Convert DVD ISO to MKV and other common formats with customizable quality and size

Remove DVD region codes and bypass all DRM copy-protections

Extract soundtrack out of DVD (TV show, film, music DVD, tutorial DVD)

Support DVD discs, DVD folders (VIDEO_TS), and ISO image files

Provide device-oriented presets for phones, tablets, TVs, and other playback targets

Provide subtitle, resolution, and other output-setting controls before conversion