How to Convert WebM to MP4 on Mac and Windows (incl. 4K)

Peter William
time June 15, 2022 Preview 7.3K
share it facebook share it Twitter

WebM, an audiovisual file format, is widely accepted by HTML5 and Chromecast. Although it works with all the modern browsers, like Safari, Firefox, Chrome, Opera, etc., it can’t be played on Mac, Windows, or other devices. To solve this problem, you’d better change the WebM file to the most compatible video format - MP4. In this article, we will introduce how to convert WebM to MP4 on Mac and Windows.

WebM vs. MP4, what’s the difference, and why to convert?

  WebM MP4
Developed by Google Inc International Organization for Standardization
Video codec VP9, VP8, AV1 H.265, H.264, MPEG-4 Part 2, MPEG-2, MPEG-1
Audio codec Vorbis, Opus AAC, MP3, and more
Quality High quality, but slightly inferior to MP4 Excellent
File size Smaller than MP4 Small
Supported devices Can't open on the computer, iPhone, iPad, etc. directly Playable on all devices

WebM is designed for browsers or the Internet, so it has an advantage on compression ratios compared to MP4. Similarly, this will also cause WebM's video quality to be slightly inferior to MP4.

Format compatibility issue is the key reason for converting WebM to MP4. As a universally adopted format, MP4 offers seamless compatibility with most devices/media players and requires very little disk space.

[The Best Way] Convert WebM to MP4 with Professional Software

On Mac Computer

Cisdem Video Converter is an award-winning program that's able to batch convert WebM to MP4 on Mac with blisteringly speed. It supports conversions among a total of 350+ formats and 50+codecs, such as MKV to AVI, MP4 to iPad, MOV to MP3, YouTube to FLAC. Thanks to its high-end features, you can edit, merge or compress WebM before converting it to MP4.

What Cisdem best WebM to MP4 converter for Mac can do for you?

  • Convert WebM to MOV, MP4, MP3, WAV, AVI, iPhone, iPad, etc. or vise versa
  • Change multiple large 4k WebM files to 4k MP4
  • Convert WebM to mpeg4, h264, or h265 encoded MP4
  • Turn DVD disc movies to any digital video and audio format
  • Play WebM file using the inbuilt video player of the software
  • Edit WebM: reset parameters, crop, trim, import .srt subtitles, make copyrighted watermarks, etc.
  • Download video from 1000+ streaming services, e.g. YouTube, Facebook, only the URL is required
  • Safe, fast to master for novices

Free Download

Steps on how to convert WebM to MP4 on Mac without losing quality:

Step 1. Add WebM files

Simply drag and drop WebM files stored on your Mac to Cisdem Video Converter. Multiple WebM videos can be added for batch conversion.

add webm mac

Step 2. Set the output format as MP4

Open the format panel and select the desired category from the left sidebar. Except for the "General Audio" category, every other category provides an MP4 output format. For example, you can navigate to “General Video” > “MP4”.

choose mp4

In addition, there is an “Advanced Settings” window for adjusting file properties. Just click "gear" alongside the format you have selected.

adjust settings

Step 3. Edit and enhance WebM videos before conversion (optional)

Click the "Edit" icon to enter the window where you can add effects to the video, trim the video to get specific parts, etc.

edit webm

Step 4. Mass convert WebM to MP4 on Mac

When all the settings are done, click the convert button. The conversion process will not take too much time.

Free Download

On Windows PC

When it comes to the best WebM to MP4 converters for Windows 10/8/7/Vista, HD Video Converter Factory should take its place. It is absolutely powerful and smart. Not only does it help you change WebM file to MP4 but to almost all popular formats. Due to its GPU acceleration, the program makes it quick to convert high-quality video.

  1. Go to the “Converter” module of the HD Video Converter Factory.
  2. Click “Add Files” to import WebM, or drag needed videos to it.add webm windows
  3. Click the output format drop-down list on the right and select MP4.choose mp4 windows
  4. Hit the “Run” button to start converting WebM to MP4 on Windows.

Turn WebM into MP4 with Freeware

VLC and Handbrake have three characteristics in common: available on multiple platforms, including Mac and Windows; free and open-source utility; have a long history. Anyway, they are all decent WebM to MP4 converters. The following is how to convert WebM to MP4 via the two freeware, taking the Mac platform as an example.

#1 VLC

VLC includes a number of free decoding and encoding libraries, so it can decode WebM formats effortlessly.

Unlike it on Windows, the Mac version will save the file to M4V after selecting MP4 as the output format. Although MP4 is basically the same as M4V, M4V videos are not uploaded to popular streaming sites such as YouTube.

Additionally, the constant problem encountered when using VLC to convert WebM to MP4, regardless of the system, is that the exported video loses sound.

  1. Click “File” at the top left corner, and choose “Convert / Stream”.convert/stream option
  2. Straightly drag and drop a WebM file to it.
  3. In the profile section, your target format - Video – H.264 + MP3 (MP4) should have been set by default.vlc webm to mp4 converter mac interface
  4. Hit the “Save as File” button to select a name and where you wish to store the converted MP4 file.
  5. Finally, click “Save”.

#2 Handbrake

Handbrake is quite a lightweight WebM to MP4 converter for Mac and Windows. It ensures that converting a video from wide codecs to .mp4/.m4v/.mkv/.webm. Prior to conversion, you can customize the video attributes.

However, there is a deficiency in converting large files, especially when your WebM video is larger than 1GB, handbrake won't render it correctly.

  1. When you open the software, a “Source Selection” panel will appear.
  2. Import a WebM video from your computer.
  3. At “Format”, select a video format – MP4.webm file to mp4 converter mac handbrake ui
  4. Change source dimensions, filters, or other parameters. (optional)
  5. Hit “Browse” to the bottom-right to set the storage location.
  6. Click the green “Start” button to begin transcoding WebM into MP4.convert mts to mp4 mac handbrake

Convert WebM to MP4 Online

If you don’t need a built-in Webm to MP4 converter on your computer or high-quality MP4 videos, you can use Web-based converters. Here, we picked two good options.

#1 aconvert

It supports the output formats like MP4, AVI, FLV, MPG, MKV, WMV, M2TS, WEBM, GIF, etc. But you can’t convert WebM to MP4 online in batch and the uploaded file size can only be up to 200M. Once the conversion is complete, you can download the MP4 video or save the file to online storage services.

  1. Visit
  2. Click “Choose Files” and open a WebM file from your Mac or Windows.
  3. Choose MP4 as the target format.
  4. Manually change video size, bitrate, frame rate, etc. (optional)
  5. Click “Convert Now”.convert webm to mp4 online 01

#2 Zamzar

Zamzar enables users to convert WebM to MP4 through the Internet without downloading software. It can also help you convert WebM to other different formats such as MKV, FLV, MP3, OGG, FLAC, WAV, GIF, WMV, etc. But you should be in a stable Internet connection environment, or you can’t enjoy the quick conversion online. Meanwhile, you are limited to 50 MB max file size on free, thus it doesn’t do well in converting large WebM like 4k WebM video.

  1. Open the Zamzar website.
  2. Upload your local WebM to the online WebM converter.
  3. Select the MP4 format.
  4. Change video by hitting the “Convert Now” button.convert webm to mp4 online 02

Can Adobe convert WebM to MP4 on Mac and Windows?

Adobe Media Encoder supports a long list of video formats, including 3GP, MOV, HEVC, ASF, AAF, etc. except WebM. To import WebM format in Adobe, a Premiere plug-in for WebM must be installed. You can try the WebM plugin created by Fnordware.


Video compression and conversion have become essential elements for many movie and music enthusiasts. To enjoy WebM videos on all devices, you need to convert them to MP4. The above shows how to convert WebM to MP4 in 3 different methods. Given the limitations of freeware and online WebM to MP4 converters, we’re more inclined to recommend professional tools.

Peter William
share it facebook share it Twitter

Peter has always had great enthusiasm for writing, programming and web development. He likes writing about software and technology, his works are featured on some tech blogs or forums like Tom's Hardware, CNET, etc.

share it facebook share it Twitter
Comments (0) Leave a Reply

Name *

Comment *

Hot Articles

Top 19 Websites to Watch Full HD Telugu Movies Online For Free Top 18 Sites to Watch and Download 4K Movies for Free Top 5 Best YouTube to MIDI Converters for Free, PC and Mac
Home > How to Convert WebM to MP4 on Mac and Windows (incl. 4K)