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Trusted by employees at these brands

Employees of some of the world's most well-known brands rely on Zamzar to convert their files safely and efficiently, ensuring they have the formats they need for the job at hand. From global corporations and media companies, to respected educational establishments and newspaper publications, employees of these organisations trust Zamzar to provide the accurate and reliable conversion service they need.

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Zamzar has converted over 510 million files since 2006

For every 10,000 files converted on Zamzar, we'll plant a tree. By using Zamzar you are helping to make a difference to our planet

We're committed to regular charitable giving. Each month we donate at least 2% of our company profits to different charities

From your personal desktop to your business files, we've got you covered

We offer a range of tools, to help you convert your files in the most convenient way for you. As well as our online file conversion service, we also offer a desktop app for file conversions straight from your desktop, and an API for automated file conversions for developers. Which tool you use is up to you!

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Convert over 150 different file formats

Convert documents, videos, audio files in one click

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One simple API to convert files

100s of formats for you to choose from

Documents, videos, audios, images & more...

Why choose Zamzar?

With Zamzar, file conversions are easy, reliable and convenient, so you can quickly convert your documents, images, videos, and more, to the formats you need. With faster downloads of converted files, and friendly and helpful support when you need it, you'll have everything you need to work with your files.

We take privacy incredibly seriously at Zamzar, and have a detailed privacy policy that you can read <a href="/privacy/">here</a>.


We take privacy incredibly seriously at Zamzar, and have a detailed privacy policy that you can read here.

Zamzar was used by the creator of PowerPoint to help him convert a very old PowerPoint into something that could be opened.

Highly Reputable

Zamzar was used by the creator of PowerPoint to help him convert a very old PowerPoint into something that could be opened.


Millions of Conversions Monthly

Zamzar's popularity grows daily and so does the number of files that get converted!

We recognise you want your files quickly, securely and converted correctly. That’s why we have a real-time conversion tool and why you don

User Experience

We recognise you want your files quickly, securely and converted correctly. That’s why we have a real-time conversion tool and why you don't need an account with us.

Tools to suit your file conversion and file compression needs

You'll find all the conversion and compression tools you need, all in one place, at Zamzar. With over 1100 file-conversion types supported, whether you need to convert videos, audio, documents or images, you'll easily find what you need and soon have your files in the formats and sizing that work for you.

WEBM Video Format

WEBM Converter

The WEBM format is an open format for digital video to be shared online. It was first introduced in 2010, and Google is now its sponsor and developer. WEBM is similar to the MKV (Matroska) format, and they are both container files where the video, audio and subtitle elements have been compressed with separate codecs. WEBM is the video equivalent of the WEBP digital image format.

An advantage with using WebM videos is that you can easily embed them into HTML5. This makes it a good format for sharing videos online, especially as the format is supported by all main internet browsers. However, WEBM isn’t necessarily the best format for storing and playing video content on your device. This is because not all media players can play WEBM videos. If you need to play a WEBM video outside of an internet browser, you can use VLC media player.

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MP4 Video Format

MP4 Converter

MP4, sometimes called MPEG4, is one of the most common video formats. MP4 was developed to be easily played and shared. It was originally developed by the Moving Picture Experts Group (MPEG) but has become an ISO standard, meaning that it’s now maintained by the International Organisation for Standardization. As MP4 is a standardised format, it will normally play easily on most devices and media players, including Windows Media Player, QuickTime, and VLC. MP4 is usually the preferred format for uploading videos to YouTube, Vimeo or other websites.

MP4 videos are made up of video and audio elements that are compressed separately. The video part is usually compressed with MPEG-4, and the audio is usually compressed using AAC, which is the audio format associated with iTunes. Because both file elements are compressed, MP4s normally have a smaller file size than many other video formats, but still maintain relatively high quality for sharing online.

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How to convert a WEBM to a MP4 file?

  1. 1. Choose the WEBM file that you want to convert.
  2. 2. Select MP4 as the the format you want to convert your WEBM file to.
  3. 3. Click "Convert" to convert your WEBM file.

Convert from WEBM

Using Zamzar, it is possible to convert WEBM files to a variety of other formats:


Frequently asked questions

If you’ve got any questions about converting or compressing files with Zamzar, we’re happy to help! We’ve answered a few commonly-asked questions below, to get you started, and you can find out more information about file conversion and compression with Zamzar, in our Help centre.

One of the easiest ways to convert a WEBM file to MP4 is by using file conversion software or an online conversion tool like Zamzar. The three-step tool on Zamzar’s website lets you securely upload a WEBM file, convert it to MP4 and then download the new video. Because it’s online there’s no extra software to install, and you can convert files in real time. It’s also possible to convert videos to different formats using some media players like VLC.

To save WEBM as MP4 you will need to convert your file using either video-conversion software or an online conversion tool. Zamzar has a free and user-friendly online tool on its website – upload a WEBM file, select MP4 as the format to convert it to, and then download your new video. Alternatively, you could install VLC media player on your computer and use this to convert your file to MP4.

MP4 is generally considered to be a higher-quality video format than WEBM, but WEBM is still good for streaming or sharing. If you need to convert a WEBM file to MP4 for editing or playing, it’s easy to use an online conversion tool like Zamzar to do that. It’s also possible to play or convert WEBM files using VLC media player. The advantage with Zamzar is that you don’t need to install any extra applications – simply upload your WEBM video, click to convert it, and then download it as an MP4 file.

There are a range of free WEBM to MP4 convertors. VLC media player lets you play and convert video files between different formats. However, one of the quickest free ways you can convert video files from WEBM to MP4 is by using Zamzar’s three-step online tool. You can convert files in real time by uploading them to Zamzar’s secure website, selecting MP4 and then downloading your converted video files.

As WEBM and MP4 are different video file formats it’s not possible to convert them by renaming the file extension. However, there is an easy way of converting WEBM files to MP4, which is by using online conversion tools like Zamzar. Just upload a WEBM video file to the three-step tool on Zamzar’s website, click to convert it to MP4 format, and then download the new video file.