How to Convert M4V to MP4: 5 Best M4V to MP4 Converters for Windows, Mac & Online (2026)

M4V vs MP4: What Is the Difference?

Key point: M4V and MP4 are technically very similar containers. Unprotected M4V files are essentially MP4 files with a different extension. DRM-protected M4V files (from iTunes purchases) require a proper converter that can handle the protection.

Why Convert M4V to MP4?

• Universal playback — MP4 works on Windows, Mac, Android, iOS, Linux, smart TVs, and game consoles
• Remove device restrictions — Break free from Apple-only playback limitations
• Easier sharing — MP4 files upload and share seamlessly on any platform
• Better editor compatibility — Most video editors prefer MP4 input
• Smaller file size — Re-encoding with modern codecs (H.265) can reduce file size while maintaining quality

Best M4V to MP4 Converters for Desktop

1. UniFab Video Converter (Free)

Platform: Windows, Mac | Price: Free

UniFab Video Converter is a free desktop tool that handles M4V to MP4 conversion with 1000+ format support, batch processing, and 50x GPU acceleration. It is a multi-function converter with extensive output video parameters customization, such as resolution, audio channel, codec, subtitles, etc., you can also edit your video file with maximum flexibility using a built-in video editor.

Key features

• 1000+ input/output formats
• Batch conversion for multiple files
• Lossless compression option
• 50x GPU acceleration (NVIDIA, AMD)
• Built-in video editor (trim, crop)
• Customizable output (codec, resolution, bitrate, audio channels, subtitles)

How to convert M4V to MP4

Pros: Free, fastest processing, most formats, batch support, no watermark 

Cons: No Linux support

2. HandBrake M4V to MP4 Converter

Platform: Windows, Mac, Linux | Price: Free (open source)

HandBrake Video Converter converts M4V to MP4 with multiple flexible functions. While offering various built-in device presets, HandBrake offers various flexible video parameter customization. From video encoder to quality and average bitrate, you can select anything to configure specifications for your output profile.

However, it doesn't convert any copy-protected content. Therefore, to convert an M4V file, first you need to remove its copy protection, and then you can convert it to MP4. 

How to convert M4V to MP4

1. Step 1: After launching the HandBrake program on your system, hit the “Source Section” > and import the M4V file while browsing it. Or else, you should  drag and drop the file into the main interface of the HandBrake program.
2. Step 2: Go to the “Destination” section > select the location to save the converted MP4 file > select the “MP4” as the output format > you can adjust various video parameters such as codec, frame rate, etc to customize the output MP4 file format.
3. Step 3: Finally, hit the “Start” option to begin the conversion process. Monitor the progress of the conversion. Once the conversion is complete, head to the destination folder to see the converted MP4 file. 

Pros: Free, cross-platform, device presets, batch scanning, video filters 

Cons: Cannot convert DRM-protected files, limited output formats

3. FFmpeg M4V to MP4 Converter

Platform: Windows, Mac, Linux | Price: Free (open source)

FFmpeg is an open-source, free command-line program specially designed to handle multimedia files and streams. It is very convenient for converting an M4V file to MP4 and has multiple other functions, such as basic editing, video scaling, etc. 

How to convert M4V to MP4

ffmpeg -i input.m4v -c:v copy -c:a copy output.mp4

This command remuxes the M4V to MP4 without re-encoding — instant conversion with zero quality loss. For re-encoding:

ffmpeg -i input.m4v -c:v libx264 -crf 23 -c:a aac output.mp4

Pros: Free, most powerful, supports all formats, zero-quality-loss remux option 

Cons: Command-line only (no GUI), steep learning curve, no batch GUI

Best Online M4V to MP4 Converters

4. CloudConvert Online M4V to MP4 Converter

Platform: Web | Price: Free (25 conversions/day)

CloudConvert is a very commonly used video converter with simple conversion steps that don't require any technical skill or knowledge. This online tool supports multiple input and output file formats and can convert M4V to MP4 on any device or platform without any dedicated software installation hassle. It also lets you convert multiple files into batches. 

How to convert M4V to MP4

1. Step 1: Open the CloudConvert official website on your device. From the drop-down menu, select M4V as an input file and MP4 as an output file.
2. Step 2: Click “Select File” to upload your M4V file from the available video uploading options, such as System, OneDrive, etc.
3. Step 3: Once the M4V file is uploaded, you need to hit the “Open” > “Convert to MP4” option. You will see the video conversion process initiated. Once the conversion process is over, hit the “Download” option.

Pros: 200+ formats, cloud import support, customization options, editing features 

Cons: 25 free conversions per day, file size limits

5. Online-Convert

Platform: Web | Price: Free (with limits)

Online Convert is a renowned online M4V to MP4 converterthat converts files in your desired format. It supports a huge range of video customization parameters, including presets, resolution, aspect ratio, bitrate, frame rate, etc. Along with these multiple function factors, this tool offers very simple video conversion steps with support for all devices and OSs.

How to convert M4V to MP4

1. Step 1: Once you open the Online Convert tool on your device, select the M4V file you wish to convert.
2. Step 2: Customize video quality, size, and other parameters > Select “Start Conversion” to convert the M4V file to MP4 > Tab “Download” to save the converted file on your system. 

Pros: All-device support, extensive settings, beginner-friendly, precise editing 

Cons: File size limits, no batch processing, slower than desktop tools

All 5 M4V to MP4 Converters Compared

Can You Just Rename M4V to MP4?

For unprotected M4V files (not from iTunes), simply renaming the file extension from .m4v to .mp4 often works because the two formats use the same container structure. However, this approach:

• Does not work for DRM-protected iTunes M4V files
• May cause issues with some media players that check file headers
• Does not allow you to change codec, resolution, or quality settings
• Is not reliable for all M4V files

For guaranteed compatibility, use a proper converter.

Tips for M4V to MP4 Conversion

1. Check DRM status first — If your M4V is from iTunes and DRM-protected, most free converters (HandBrake, FFmpeg) cannot handle it. You may need specialized DRM removal tools.
2. Try remuxing before re-encoding — If you just need a container change without quality modification, remuxing (FFmpeg -c copy or UniFab passthrough) is instant and lossless.
3. Match original quality — When re-encoding, match the source resolution and use a quality-based setting (CRF 18-23 in FFmpeg, or "High Quality" presets) to avoid unnecessary quality loss.
4. Use batch conversion for libraries — If you have many M4V files, use UniFab or HandBrake's batch feature rather than converting one at a time.

Conclusion

So, it has become easy to unlock and enjoy your M4V file on any device at any time using any of these M4V to MP4 converters. However, to make your output MP4 file high quality with lots of high-end customization factors, you must go for the advanced UniFab Video Converter instead of any online tool and its risky challenges. 

FAQs about M4V to MP4

What is the difference between M4V and MP4?

M4V is Apple's proprietary video format, primarily used for iTunes and Apple TV content. It often includes FairPlay DRM protection that restricts playback to authorized Apple devices. MP4 is an industry-standard format that plays on virtually any device and platform. Technically, unprotected M4V and MP4 use very similar container structures — the main difference is DRM capability and device compatibility.

Can I just rename M4V to MP4?

For unprotected M4V files, renaming the extension from .m4v to .mp4 often works because the container formats are nearly identical. However, this does not work for DRM-protected iTunes M4V files, and some media players may reject renamed files that do not match their expected header format. For reliable results, use a proper converter.

What is the best free M4V to MP4 converter?

UniFab Video Converter is the best free option for desktop conversion — it supports 1000+ formats, batch processing, and 50x GPU acceleration with no watermark. HandBrake is another excellent free option with cross-platform support. For command-line users, FFmpeg offers the most powerful conversion capabilities. CloudConvert is the best free online option with 25 conversions per day.

How do I convert DRM-protected M4V to MP4?

DRM-protected M4V files from iTunes cannot be converted by standard free tools like HandBrake or FFmpeg. You need specialized DRM removal software, or you can download the content again from Apple in a DRM-free format if available. Some iTunes movies and TV shows purchased after 2009 may be available in DRM-free versions. Check your iTunes library for available re-downloads.

Is M4V playable on Windows?

Unprotected M4V files can play on Windows using VLC Media Player or other compatible players. DRM-protected M4V files from iTunes typically cannot play on standard Windows media players — they require iTunes or Apple TV app for Windows. Converting to MP4 removes this restriction for unprotected files.

How do I convert M4V to MP4 on Mac?

On Mac, you can use UniFab Video Converter (free), HandBrake (free), or FFmpeg (command-line). For the simplest workflow, use UniFab: open the Converter module, add your M4V file, select MP4 as output, and click Start. For unprotected files, HandBrake's Mac version works equally well with device-optimized presets.

Does converting M4V to MP4 lose quality?

Not if done correctly. Remuxing (container change without re-encoding) produces zero quality loss — the video and audio data are simply repackaged from M4V to MP4. Re-encoding introduces minor quality changes, but using high-quality settings (CRF 18-23 or lossless mode) minimizes this to imperceptible levels. Always use the highest quality setting your file size allows.

How long does M4V to MP4 conversion take?

Remuxing (container change only) takes seconds regardless of file size. Re-encoding depends on file size, resolution, and hardware. A 2-hour 1080p movie takes 5-15 minutes with GPU acceleration (UniFab, HandBrake) or 30-60 minutes with CPU-only processing. 4K content takes 2-4x longer. Online converters are the slowest due to upload and download time.

Can I convert M4V to MP4 on my phone?

Direct M4V to MP4 conversion on phones is limited. Most mobile video editors do not handle M4V input well. The best approach is to convert on a desktop computer and transfer the MP4 file to your phone. Alternatively, use an online converter (CloudConvert, Online-Convert) from your phone's browser for small unprotected M4V files.

What is the fastest way to convert M4V to MP4?

The fastest method is remuxing (copying streams without re-encoding) using FFmpeg (-c copy flag) or UniFab's passthrough mode — this takes seconds. If you need to re-encode (for codec change or quality adjustment), UniFab's 50x GPU acceleration is the fastest desktop option. For a single small file, simply renaming the extension from .m4v to .mp4 may work for unprotected files, though this is not guaranteed to be compatible with all players.