Do you have a video in MKV format that you can neither open nor play on many portable devices like Apple iPad, iPhone, Android phone, or even third-party video players? You may wonder if there is any free MKV to MP4 converter that can help you deal with it. Fortunately, transcoding files from MKV to MP4 is becoming quick and easy as soon as you reach here and find the capable MKV to MP4 converter.

1. Best Free Mkv Converter For Mac
2. Free Iso To Mkv Converter For Mac
3. Mac Mkv To Mp4
4. Free Mkv File Converter

MKV vs. MP4

Jan 20, 2021 Part 1. Free Online MKV Converter for Mac. Free Online Video Converter is an easy-to-use video converting tool which enables you to convert MKV to MOV, MP4, or other video/audio formats based on your need. It is compatible with both Mac and Windows computer. This free MKV converter for Mac supports any popular video formats including MKV, MP4. Free MKV to AVI Converter is an absolutely free application which converts Matroska video files (MKV) to AVI or MPEG. MKV is an open standard of multimedia container that allows to embed multiple audio tracks and subtitles in one file. For this reason it is very often used to rip DVD and Blu-ray discs.

MKV, also known as Matroska Video files, is an open-source and flexible video file format that is wildly used for HD videos. It remains future-proof and supports a high quality of both video and audio formats. MKV is also a basic format for WebM video, which pursues making a high-quality, free video format that is available to all of us.

MPEG-4, shortly known as MP4, is also a digital multimedia video format that has high compatibility and good performance among all video formats. It allows a high degree of compression without loss in quality. MP4 files are more user-friendly since it is easy to be copied, moved, and played. You can easily enjoy MP4 videos on most common video players.

Here we offer a comparison table between MKV and MP4. Check it to get more information about the differences.

After contrasting the two video formats, you may find that MP4 is more applicable in most cases. That's why so many people are looking for solutions to convert MKV to MP4. Next, we are going to demonstrate each solution to convert video to MP4. You can follow the user guide and learn how to convert MKV to MP4 free on Windows, Mac, and online without losing quality.

Top 2 MKV to MP4 Converters on Windows for Free

There are two free video converters we will recommend in this part. Both of them can be used on Windows computers. Read on to get more information and learn how to convert MKV to MP4 on Windows for Free and never lose the original quality of your MP4 videos.

1. EaseUS Video Editor - An MKV to MP4 Converter Especially for Windows Users

One of the simplest solutions to transfer an MKV video format to MP4 is using EaseUS Video Editor, a free Windows 10 video editor that has many more robust functions. The first impression of EaseUS Video Editor is always simple yet powerful. On top of that, there are more persuasive reasons that empower it to rank on the top recommendation to modify an existing video format to the other, including:

• Support all Windows operating systems
• Support most popular source and target video formats
• Convert video to MP4 or many other video or audio conversions
• Support all-around video editing while converting
• Support playing the MKV video before file conversion

Once downloaded the EaseUS Video Editor - the best free video converter for Windows 10, you'll be greatly satisfied with its ease of use, and the fast speed in taking care of some lengthy video files as well.

The tutorial of converting MKV to MP4 on Windows 10 without losing quality using EaseUS Video Editor:

Step 1. Import the source file

Launch EaseUS Video Editor. On the home screen, you can import the source file by either clicking the 'Import' option or simply dragging the video to the appropriate area.

Step 2. Add to project

You need to add the imported file to the track by choosing the 'Add to Project' option, or you can drag and place the video to the track as you want.

Step 3. Export the source file

Now you can click 'Export' on the main menu on the top.

Step 4. Save as MP4/AVI/WMV/MKV/MOV/GIF

Under the 'Video' tab, choose a file format among the available options as the desired video file format.

On the right pane, you can edit the file name, customize an output folder and settings and then click 'Export'.

2. VLC - A Free MKV to MP4 Converter on Windows

When it comes to mentioning an MKV video, we must introduce VLC media player, which is one of the rare MKV compatible media players on the market. It's said that VLC is people's favorite choice for playing MKV files, mostly because it has built-in support. Better yet, it can also convert the MKV files to something more universal as MP4 for free.

One advantage of using VLC over the EaseUS video converter is that VLC is a cross-platform supported application. Both Windows and Mac users can benefit from the program. Only one difference that average users should notice, the process of converting MKV to MP4 with VLC is somewhat time-consuming.

Here are steps to convert MKV to MP4 with VLC on Windows:

Step 1. Download and run VLC media player on your PC or Mac.

Step 2. From the main menu, select 'Media > Convert/Save...'.

Step 3. On the File tab, click 'Add...' to add your MKV video to the list. (You can also use the drag & drop feature to upload the MKV file)

Step 4. Click 'Convert/Save...'.

Step 5. Specify your desired video format. You should choose 'H.264 + Mp3 (MP4)'.

Step 6. Specify under Destination to select a path to export the MP4 file.

Step 7. Click 'Start'. Once the timeline progress finishes, your video will be ready.

The Best MKV to MP4 Converter on Mac - Permute

Mac users may have a large demand for an MKV to MP4 converter because macOS does not natively support MKV. If you were sent an MKV file, you would have to convert it into MP4. Here we suggest you use Permute, a versatile video converter for macOS users. What's good about Permute is that you don't have to get an MP4 converter or FLV converter specifically, because it can mostly deal with all possible formats without losing quality.

How to convert MKV to MP4 on Mac with Permute:

Step 1. Download and open Permute on your Mac.

Best Free Mkv Converter For Mac

Step 2. Click on 'File > Open' from the menu bar, .

Step 3. Upload the MKV file that you want to convert to MP4 and select 'Open'.

Step 4. Click 'Video' at the top-left corner and drop down the menu to choose 'MP4'.

Step 5. Click the 'play' button in the sub-window of your MKV file, which will start the conversion.

Top 5 Best MKV to MP4 Converters Online

The best part of having an online video converter is that you don't necessarily download it, and it doesn't matter what operating system you're running, only what internet browser defines its usability.

When searching the best online MKV to MP4 converter on Google, you'll get overwhelming results that will definitely make you lost. How to choose the best online MKV to MP4 converter among the vast sea? Don't bother. We've made the decision for you.

1. ConvertFiles - A Simple Online MKV to MP4 Converter

ConvertFiles is a free online MKV file converter, which can work directly from your browse. It supports almost all video and audio formats, besides, the MKV to MP4 conversion is very simple and fast. All you have to do is to upload your MKV file, choose the MP4 as the output format, and click 'Convert' at last. If you want to change the format of audio, image, and document, you also can complete the task with this online converter.

2. ZAMZAR - A Powerful Free Online MKV to MP4 Converter

ZAMZAR is another popular free MKV converter. This online MKV converter program supports more than 1,200 file formats, including MKV, AVI, WMV, MOV, and many more. Moreover, it has a high speed for MKV to MP4 conversion, you can finish the task within 10 minutes. (usually, it only takes 1-2 minutes) If you don't know how to convert MKV file to MP4, don't fret. You can check the simple steps on the interface.

3. FileZigZag - A Fast and Easy MKV to MP4 Converter

FileZigZag can help you change your file formats for free, with support for document, images, ebook, audio, archives, and video formats. MKV to MP4 converter is just a little part of its functions. It uses a sophisticated conversion engine to deliver the best quality conversion. All the MKV to MP4 conversion will be done in a short time and the output file quality is the best. What's more, this online software will delete all the uploaded files after 24 hours to protect your privacy.

4. Convertio - An Online MKV Converter for Free

Convertio is a great online MKV to MP4 converter, which supports over 25600 different conversions between more than 300 different file formats. For turning MKV files into MP4, the conversion takes place in the cloud and will not consume any capacity from your computer. This online converter offers many advanced options to choose quality, aspect ratio, codec, and many others. Most importantly, this MKV to MP4 converter can work for all platforms. You can convert from MKV to MP4 free anywhere, anytime.

5. Online-Convert - A Free MKV Video to MP4 Converter

Online-Convert also provides many file conversions, like audio, document, image, image, and more. You can import your MKV files from your computer, Dropbox, and Google Drive. It lets you easily convert MKV files to MP4. Apart from changing the MKV file format, it offers a great many editing options. You can choose a preset, change screen size and video bitrate and frame rate. Also, you can simply rotate, mirror, and crop your video with the online MKV converter.

Tips about changing MKV file to MP4 with Online MKV Converter:

The operation of online file conversion software is pretty the same: Upload files from a local drive (Some support uploading from Cloud) > Choose a destination file format (MP4) > Start/Convert.

Conclusion

Whenever you need to convert MKV to MP4 to solve the incompatible issue on certain devices or reduce the file size, choose the right MKV file converter among the best found on this page, based on your needs.

If you are a Windows user, we recommend EaseUS Video Editor. This software can help you turn MKV files into MP4 easily without losing quality. Before converting, you can modify your video with wonderful video editing tools, like cropping, trimming, splitting, reversing, etc. Also, this program offers over 300 visual effects to make your video files more attractive. Now get ready with the MKV to MP4 converter and start to convert MKV to MP4 easily and effectively.

FAQs About Converting MKV to MP4

There are some other questions about converting MKV to MP4. If you want to know more about it, just continue reading.

1. How can I convert MKV to mp4 for free?

Using EaseUS Video Editor, you can convert MKV to MP4 for free. You can refer to Part 2 to learn how to turn MKV into MP4.

2. How do I change an MKV file to mp4?

To change an MKV file to MP4, you can use some MKV converters. Here is the list of MKV to MP4 Converter. EaseUS Video Editor

• VLC Media Player
• FFmpeg
• ConvertFiles
• Zamzar

3. What is the best free MKV to mp4 Converter?

Here are the seven best free MKV to MP4 Converter.

• EaseUS Video Editor (Windows)
• VLC Media Player (Windows/Mac)
• CovertFiles (Windows/Mac/Linux)
• Zamzar (Windows/Mac/Linux)
• FileZigZag (Windows/Mac/Linux)
• Convertio (Windows/Mac/Linux)
• Online-Convert (Windows/Mac/Linux)

4. How do I convert MKV to mp4 with VLC?

VLC is an open-source MKV to MP4 converter. You can move to Part 2 to check more details about how to change an MKV file to MP4.

by Christine Smith • 2020-09-21 16:04:06 • Proven solutions

Part 1. 10 Free Video Converters for Mac Users (macOS 10.15 Included)

User-friendly program interface. Designed with an easy-to-use program interface, Leawo Blu-ray to MKV Converter for Mac offers an extremely easy method for users to import and convert Blu-ray/DVD content. No expertise is required to operate the program. User-friendly program interface. Wanna convert MKV to MP4 on Mac (OS X Yosemite included)? While stay on the page and you will get a good video converter for Mac OS X Yosemite, helping you convert MKV format to MP4 with ease. How to Free Convert MKV to AVI Format on Mac with Ease To convert MKV video to AVI format, a video converter can do you a favor. Cisdem DVD Burner is one of the best MKV to ISO converters available for Mac that's armed with an array of features to make your ISO creating and DVD burning more smoothly. The application supports over 200 video formats, meaning that apart from MKV, you can burn MP4, FLV, AVI, AVCHD, DIVX, MOV, etc. To ISO format/DVD disc as well.

There are several situations when you may need to convert your file formats like playing them on an array of devices, sharing them over the Internet, uploading them to YouTube, resizing video size, record desktop activities, and others. In all such and other situations, a need for an excellent video converter arises. What's the best video converter for Mac? If you have a Mac system and are looking for a free solution, here are the best ten free video converters for Mac.

• Wondershare Free Video Converter for Mac
• Handbrake for Mac
• Any Video Converter for Mac
• Freemake Video Converter
• QuickTime
• DivX Video Converter
• Media Coder
• FFmpegx
• MPEG Streamclip
• Miro Video Converter Free

1. Wondershare Free Video Converter for Mac

It is one of the best free Mac video converters that are compatible with working on OS X 10.6 -10.15 versions. Using this feature-rich program, you can convert both video and audio files in over 1,000 formats like MP4, AVI, MKV, DVD, and others to iOS compatible devices like iPhone, Apple TV, iPad, Apple Generic, and others. The converted files using the Macx video converter are of decent quality, and the conversion speed is also fast. It also allows downloading videos from YouTube and other 10,000 sites to your desired formats. Useful and straightforward editing features like Trim, Crop for personalization are also supported. Meanwhile, you can record your desktop activities with this converter as well.

How Do I Convert Video to MP4 on Mac for Free?

1. Launch the Wondershare Video Converter for Mac and add the video file.
2. Select MP4/MKV/MOV or any other format as the output format.
3. Click on Convert to start the conversion for free.

Step 1 Launch the Best Free Video Converter for Mac and import videos.

Launch the Video Converter Free for Mac. Drag and drop files to the program, like MPG, WMV, MP3 from your Mac that you want to convert. Alternatively, select the Convert tab, click the Add Files to browse and add files.

Step 2 Select MP4/MKV/MOV or another format as the output format.

Added videos appear as thumbnails on the Mac video converter interface showing file details, including size, format, etc. Select the target format to which you want to convert your videos by clicking the drop-down icon beside Convert files to> Video > the format and the resolution.

Step 3 Convert files to MOV/MP4/MKV on Mac.

At the Output tab, choose a location on Mac where you want to save the converted files. Finally, hit Convert All to start the video conversion process.

2. Handbrake for Mac

It is a widely-used open-source video converter Mac that supports an array of input formats, but the output formats are only MP4, M4V, and MKV. This cross-platform program is compatible with Mac, Windows, and Linux systems. In addition to decent quality conversions, Handbrake also supports advanced features like adding subtitles, adding audio tracks, setting and customizing frame rate, changing video codec, adjusting chapters, and others. Presets for quick conversions are also available.

There are various pros and cons associated with using the MP4 converter Mac.

Pros:

● A wide array of input format supports converting almost all types of files.

● It comes with advanced control features.

● Presets for quick conversion.

Cons:

● It reminds of potential virus risk during installation.

● It supports limited output formats.

● Only the first four minutes are supported during the Live preview.

3. Any Video Converter for Mac

This software, with a minimalist interface, is one of the best tools for your video conversion needs. Any Video Converter Free for Mac supports 24 input formats like MP4, MPEG, VOB, WMV, 3GP, 3G2, MKV, and more. The batch processing feature is also present to process multiple files at a time. User-defined video outputs help in quick conversion. The program is also capable of extracting audio files from your videos. YouTube and Google videos can be directly downloaded and converted to desired formats by merely placing their link.

Is Any Video Converter free indeed? Many users concern about this problem, so we have tested it. It is not free but with a trial version. With the free version, you can convert files in the first 3 minutes.

Pros:

● Good quality video conversion.

● It can download videos from YouTube and Google.

● It supports popular video formats.

Cons:

● Slow conversion speed.

● The program attempts to install additional software during the setup process.

● It doesn't support audio input formats.

4. Freemake Video Converter

As the name suggests, it is a video converter mac program. But do not be mistaken, Freemake video downloader for Mac is also a powerful video size compressor that delivers high-quality products. It can convert movies and videos between 500+ formats for absolutely nothing.

Here are some pros and cons:

Pros:

● It is fast.

● It can convert over 500+ formats.

● It can perform on various operating systems.

Cons:

● Some customization tools are missing on this online mac video converter.

● It cannot run on iOS and Android devices.

5. QuickTime

QuickTime is the built-in video player of the Mac system that multitasks and performs an array of other functions as well, including video conversion. While using QuickTime, there is no need to download any software or program as it comes bundled with the system. The process of video conversion is quick and straightforward.

Pros:

● It is preinstalled with Mac and thus no need for any software download.

● Simple interface with easy-to-use features.

● It allows choosing for different resolutions.

Cons:

● No batch processing option.

● It has limited codec support.

● Limited features as compared to other programs

6. DivX Video Converter

It is another popularly used converter for Mac that supports a decent list of input and output formats. The program comes with editing tools so that you can customize videos before conversion. In addition to local files, you can also add videos from Blu-ray discs, Google Drive, and Dropbox for conversion. A Windows version of the software is also available.

Pros:

● Simple to use interface.

● It allows setting resolution, aspect ratio, bit rate, and other file parameters.

● It comes with some predefined options.

Cons:

● Push you to try and upgrade to the paid premium version.

● The problem of program freezing.

7. Media Coder

It is another feature-packed conversion tool that works on Windows, Mac, and Linux systems. Using the video converter on Mac, you can convert all popular video types in an array of formats and can convert multiple files at a time. The software supports CUDA, NVENC, and QuickSync for a fast conversion. There is also an option for adjusting the bit rate and other file parameters.

Pros:

● Fast conversion speed while maintaining high quality.

● It allows setting for converting videos to grayscale and quarter-pixel.

● Bitrate setting works for audio and video parts of the file.

Cons:

● Features are inclined towards tech-savvy users and thus not very friendly for new users.

● There are too many download buttons on the site.

8. FFmpegx

Another free Mac video converter that allows good quality conversion of your files is FFmpegx. The program is based on the collection of UNIX tools, which not only makes it flexible but compelling as well. The drag and drop interface of the software makes it easy to use for all types of users. FFmpegx supports a wide array of formats and also allows customizing files as needed with different tools. The conversion speed of the program is also breakneck. There is also a subtitle converter with OCR with the feature of VOB to SRT text format.

Pros:

● It supports almost all popular and used video formats.

● It allows video customization with features like automatic crop tool, video tools, bitrate calculator, and others.

● Simple drag and drop interface.

Cons:

● Not very friendly and easy for beginners to use.

● The official documentation is confusing and complicated.

9. MPEG Streamclip

If you are in search of a simple and easy to use video converter, MPEG Streamclip is the right choice. Using the software, you simply have to drag the files to the interface and select the desired output format. The converter has options to customize your videos using different tools. In addition to video conversion, the software can also be used for playing files, edit them to convert them into muxed files.

Pros:

● Simple to use and understand.

● It has a wide range of supported formats.

● It allows editing videos using Cut, Copy, Paste, and Trim function.

Cons:

Mkv Video Converter Free

● The design is not very impressive.

10. Miro Video Converter Free

Miro is another free to use, open-source video conversion tool for Mac users. Using the software, you can convert all types of videos to WebM, MP4, or OGG Theora. The program also allows converting your files for formats that are fit to be played on Android, iPad, and iPhone. Custom sizing and batch conversion support are additional features. Windows version of the software is also available.

Pros:

● Open-source and freeware video converter.

● Simple to use interface.

Cons:

● They have limited output formats.

● They have limited video editing features.

Part 2. 2 Online Video Converters Free for Mac Users

1. Online UniConverter

Have you been on the lookout for a free online video converter for Mac that is both fast and equally reliable? Well, Online UniConverter is the best of both worlds. It is an online video converter that has a friendly user interface and very professional in its work.

Pros:

● It has very high conversion speeds, thus, saving you a lot of time.

● High-speed download. Once the conversion is complete, it allows you to download the videos swiftly.

● It provides unlimited file compression. It means you can compress as many videos as you want.

Cons:

● Since it is an online application, you must be connected to the Internet to use it.

● It has limited customization tools.

2. Apowersoft Free Mac Video Converter

Apowersoft Free Online Video Converter is another name in the list of top free Mac video converters. The program converts your file to the desired format with decent quality and fast speed. The software is compatible with working with all types of Mac laptops and desktops and works on almost all types of browsers, including Safari, Firefox, Chrome, and others. Bitrate, frame rate, video resolution, sample rate, channels, and audio bit rate can be edited as needed.

Pros:

● Simple to use.

● Support all commonly used formats.

● It has no setup process and can be used online.

Cons:

● Dependent on internet connectivity.

● File size limits.

Part 3. Best Video Converter for Mac You Should Know

If you are seeking for an all-round Mac video converter with the best video output quality, fastest video conversion speed and the most formats supported, Wondershare UniConverter (originally Wondershare Video Converter Ultimate) will be your top choice. Its built-in versatile toolbox will impress you a lot!

Wondershare UniConverter - Your Complete Video Toolbox

• Convert videos on Mac over 1000 formats like AVI, MKV, MOV, MP4, etc.
• Convert video to optimized preset for almost all of the devices.
• 30X faster conversion speed than other conventional converters.
• Edit, enhance & personalize your videos by trimming, cropping, adding subtitles, and more.
• Burn video to playable DVD or Blu-ray disc with an attractive free DVD template.
• Download or record videos from YouTube and other 10,000 video sharing sites.
• Versatile toolbox includes fixing video metadata, GIF maker, casting video to TV, VR converter, and screen recorder.
• Supported OS: Mac OS 10.15 (Catalina), 10.14, 10.13, 10.12, 10.11, 10.10, 10.9, 10.8, 10.7, 10.6, Windows 10/8/7/XP/Vista.

Watch Video Tutorial to Convert Videos Easily With Best MP4 Converter for Mac

Features of Wondershare UniConverter for Mac:

1. Convert video to over 1,000 video/audio formats as well as optimized devices and editing software.

2. Edit video before conversion via Trim/Crop videos, add Watermark/Subtitles, apply Effects, and adjust Audio.

3. Download videos from YouTube, Netflix, and other 10,000 video sharing sites.

4. Record screen with the built-in screen recorder.

5. Burn videos to DVD or Blu-ray discs with many free templates.

6. Compress video to a smaller size for secure storage or sharing.

7. Transfer converted or downloaded video to any iOS and Android devices.

8. Versatile video toolbox consists of Fix Media Metadata, GIF Maker, VR Converter, DVD Copy, etc.

If you want to know more features and tips on how to use this video converter on Mac, just move to How to Use UniConverter on Mac Easily >> to learn more.

Part 4. Comparison Table Between These 12 Free Converters for Mac

MKV to TV Converter - Convert MKV to TV on Mac/Windows

Overview

Mkv Converter For Mac

When I play MKV on my LG TV I can not get any audio but a message 'unsupported audio' But it can be played well on my PC. Can this problem be fixed? Thanks.

I have recently purchased a Samsung TV and everything is fine until I try to play some MKV on it. A message reports to me saying the MKV has an unsupported audio. I know little about the audio codec, so is there some easier way to solve this?

Recently many users have reported the issue 'unsupported audio' encountered when playing MKV on Smart TV, not only LG TV, Samsung TV, but also Sony TV, Apple TV, Toshiba TV, Sharp TV, etc. So now the following article just aims to explain why this issue happens as well as offer a solution to 'MKV file audio not supported on some kinds of TVs'.

Why MKV File Audio not Supported on Some Kinds of TVs?

The supported audio codec will vary depending on the TV brand and TV model. For example, most of LG TVs support to play MKV with Dolby Digital, PCM, DTS, MPEG-1 Layer I, II, MPEG-1 Layer III (MP3), AAC. Most of Samsung TVs support to play MKV with codecs, like Dolby Digital, AAC, WMA, Dolby Digital Plus, DTS, etc. So when you play MKV with WMA audio codec on LG TV or MKV with MPEG-1 Layer I on Samsung TV you will fail with getting the message 'unsupported audio'.

How to Solve 'MKV File Audio not Supported on Some Kinds of TVs'?

To solve this issue what we only need to do is to convert the unsupported MKV to your TV supported MKV with the supported audio codec, like converting the unsupported MKV with WMA to LG TV supported MKV with DTS codec or converting MKV with MPEG-1 Layer I to Samsung TV supported MKV with Dolby Digital codec or converting MKV with the unsupported audio codec to your other TV supported MKV.

MKV to TV Converter - Avdshare Video Converter

Avdshare Video Converter is just the right MKV to TV converter which can support to convert MKV with any unsupported audio codec to all kinds of TVs supported MKV, including LG TV, Samsung TV, Sony TV, Toshiba TV, Sharp TV, Panasonic TV, Apple TV, etc. Besides this multifunctional MKV to TV converter has the following features:

1. Convert MP4, AVI, TS, 3GP, MOV with any unsupported audio codec to LG TV, Samsung TV, Sony TV, Toshiba TV, Sharp TV, Panasonic TV, Apple TV supported formats.
2. Convert MKV with any video and audio codec to MP4, AVI, MOV, TS, 3GP supported format.
3. Convert between any two video formats.
4. Edit any video file.

Convert MKV to TV Guide

Follow the guide below to convert the unsupported MKV to your TV. The guide will take converting the unsupported MKV to LG TV as the example.

Make Preparation: Free download MKV to TV Converter

Free download the professional MKV to TV Converter - Avdshare Video Converter (for Windows, for Mac), install and then launch it, the following interface will pop up.

Step 1 Import MKV files

Click 'Add file' button to add the unsupported MKV to Avdshare Video Converter. Also support to drag and drop the unsupported MKV to Avdshare Video Converter.

Mkv For Mac Converter Freeware

Free Iso To Mkv Converter For Mac

Step 2 Targeted output format setting

Click 'Profile' button to choose MKV DTS from the 'General Video' category as the output format.

Step 3 Convert MKV to LG TV

Mac Mkv To Mp4

Best Free Mkv To Mp4 Converter

Click 'Convert' button to complete converting MKV to LG TV supported MKV.

Free Mkv File Converter