“I’ve downloaded a video off the internet in .webm extension. I want to convert it to MP4 for playback on my iPhone 5S. Is there any free way to convert WebM file to MP4?”

Possibly you have gotten some WebM files from video sharing sites like DailyMotion, Facebook, VEVO, etc. Even though WebM format gains rising popularity online but it’s not well supported by nearly all media players like iPhone, iPad and more. Then it’s quite possible that you have to convert WebM to MP4 video, since MP4 is accepted by all media players, mobile devices and various software programs. If you now look for some ways to convert WebM file to MP4, consider it done here. Actually I will show you how to complete the WebM to MP4 conversion below.

Part 1: Basic Knowledge About WebM


What is WebM?

WebM is an open, royalty-free, media file format designed for the web. WebM defines the file container structure, video and audio formats. WebM files consist of video streams compressed with the VP8 or VP9 video codecs and audio streams compressed with the Vorbis or Opus audio codecs. The WebM file structure is based on the Matroska container.

Benefits of WebM:

Openness and innovation: A key factor in the web’s success is that its core technologies such as HTML, HTTP, and TCP/IP are open for anyone to implement and improve. With video being core to the web experience, a high-quality, open video format choice is needed. WebM is 100% free, and open-sourced.

Optimized for the web: Serving video on the web is different from traditional broadcast and offline mediums. Existing video formats were designed to serve the needs of these mediums and do it very well. WebM is focused on addressing the unique needs of serving video on the web.

Part 2: Convert WebM to MP4 Online with Online Converter

One one hand, you can use an online video converter to convert WebM to MP4 online, such as Online Converter. It is easy to convert WebM to MP4 online with this WebM to MP4 converter online.

Convert WebM to MP4 online step by step:

  • Step 1: On the main page, click “Video Converter” and then select “WEBM Converter” among a list of various video converters.
  • Step 2: On WEBM Converter page, choose “WEBM to MP4” under “Convert” box, and choose file source from two options (upload file or from a URL).
  • Step 3: If the source is “Upload file”, click “Choose file” to browse and upload source WebM File while you need Enter URL of the file if “From a URL” is chosen.
  • Step 4: Click “Convert” button to start uploading your file. Once completing uploading, the converter will redirect a web page to show the conversion result.
  • Step 5: After the converting process is completed, you should click “Download” button download the converted file from online converter’s server.

Part 3: Convert WebM to MP4 Offline with WebM to MP4 Converter Program

On the other hand, you can use a video converting program to convert WebM to MP4 offline, such as Leawo Video Converter, which could act the role of a WebM to MP4 converter by providing you with the easiest way to convert WebM to MP4 for successful playback on any MP4 compatible devices like iPhone, iPad, iMovie and other software or media players. The conversion process comes with fast processing speed, high output video quality. Not limited to converting WebM to MP4, you can still use it to convert video between over 180 formats. Now want to experience its full features? Follow me!

Step 1: Download and install Leawo Video Converter

Before I show you the tutorial, please get the WebM to MP4 converter downloaded on your Win computer. Then install and run it. If you run on a Mac, be sure to turn to its Mac version – Leawo Video Converter for Mac here.

Step 2: Import source WebM Files

You can import WebM file via either clicking “Add Video” button on program toolbar or directly dragging and dropping. Multiple WebM files could be imported. You can still experience program features like subtitle selection or addition, audio track option, source file preview, etc. here.


Step 3: Choose MP4 as output format

Click the drop-down box next to the “Add Photo” button. On the drop-down list, select “Change” option. Then on the popup Profile window, select MP4 as output format for converting WebM to MP4.


Optional:If you need, you could click the “Edit” button on the drop-down profile setting box to adjust video and audio parameters like video codec, aspect ratio, frame rate, resolution, audio codec, bit rate, channel, sample rate, etc.


Step 4: Convert WebM to MP4

Click the big green “Convert” button on the sub-menu bar next to the format setting drop-down box. Then, on the popup sidebar, set output directory. After setting output directory, click the “Convert” button right below. Leawo Video Converter would start converting WebM to MP4 immediately.


Video guide on how to use Leawo Video Converter: