Best for: converting a batch of MP4 files and anyone who also wants to edit or compress.
Video Converter Ultimate
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Quick Guide:
Convert MP4 to WebM for maximum web compatibility at a small size:
One or two clips, no install allowed: CloudConvert Online Video Converter
A folder of MP4s, free, on your own PC: Aiseesoft Video Converter Ultimate
MP4 is the most widely used video format that can be played on almost all players and devices. WebM is another video format that mainly works on websites. If you are building a website, you may prefer WebM video because it delivers the same quality with a smaller size. To improve web performance, convert your video from MP4 to WebM. This article will show you 3 methods to convert MP4 to WebM.
MP4 is a widely used multimedia format that works on almost all operating systems, devices, and editing platforms. It balances good audio and video quality with efficient compression, making it a standard choice for storing, sharing, and broadcasting media files.
WebM is a free, open-source video format created by Google to make video delivery and streaming faster on the web. It uses advanced compression like VP9 and AV1 codecs and supports transparency. WebM files are smaller and load quickly, so they are a popular choice for websites and online publishing.
| MP4 | WebM | |
| Container / codecs | H.264 / H.265 | VP8 / VP9 / AV1 |
| Compatibility | Nearly universal — players, phones, editors | Best in browsers (Chrome, Firefox, Edge) & HTML5 |
| File size | Larger at the same quality | Smaller at the same quality (VP9/AV1) |
| Licensing | Patented codecs | Open and royalty-free |
| Best for | Sharing, editing, offline playback, devices | Web embedding, streaming, smaller uploads |
Best for: converting a batch of MP4 files and anyone who also wants to edit or compress.
When you want to convert MP4 to WebM and need to edit MP4 files, apply 3D effects, merge/clip/rotate/enhanP4 videos, or add a watermark to videos, Aiseesoft Video Converter Ultimate is the best MP4 to WebM converter.
This MP4 converter lets you batch-convert MP4 files quickly, with high-quality output on Mac or Windows. You can also convert HD videos or extract audio (MP3/AAC/AC3/WMA/WAV) from your video files. You can also do batch conversions and take snapshots with ease. The output media formats are compatible with most devices, including iPhone, iPad, Apple TV, Samsung, Sharp, HTC, Sony, LG, and more.
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Best for: one or two clips on a computer where you can't install anything.
With an online converter, you don't need to download and install the software on your computer. If you want to convert a couple of MP4 videos to WebM, you definitely don't need to download a video-converting tool. You can try the CloudConvert MP4 to WebM converter, which is simple, has a clean interface and completes conversions efficiently with high quality and fast speed. This program is compatible with Windows and Mac and lets you add up to two files at a time, with no size limit.
Best for: If you already have VLC on your computer.
VLC Media Player is one of the most widely used free, open-source media players. While most people know it simply as a tool to watch movies and listen to music, it is built on top of a powerful multimedia framework capable of decoding and encoding almost any video or audio format without requiring third-party codec packs. Because VLC includes built-in encoders for formats like H.264, H.265, VP8, VP9, MP3, and Vorbis, it can also serve as a capable file converter. This makes it a great choice if you already have it installed and want to convert files locally without uploading private videos to third-party web services.
What is WebM format?
WebM format was developed by various parties, including Google, and you can play WebM files in web browsers using HTML5 or with a dedicated player.
Why should I convert MP4 video to WebM?
WebM is widely used by online video-sharing sites like YouTube, and it can compress videos into smaller files than MP4.
Will converting MP4 to WebM reduce the video quality?
Yes, slightly. Both MP4 and WebM use lossy compression. When you convert from one lossy format to another, re-encoding causes a small loss of quality. However, the visual difference is virtually imperceptible to the human eye.
Why won't my WebM video open in QuickTime or play on an iPhone?
Apple’s built-in player and native iOS Files/Photos app historically do not support the WebM container. To play WebM files on a Mac and iPhone, use VLC Media Player or open them directly inside Google Chrome / Safari.
Can I convert a WebM file back to MP4 later?
Yes. You can convert WebM back to MP4 anytime using the same tools mentioned above. For quick conversion of multiple files, I suggest using Aiseesoft Video Converter Ultimate.
Conclusion
Overall, if you want a reliable and professional video converter, Video Converter Ultimate is a good option. It offers many popular features in one program, so converting MP4 to WebM offline in batches is quick and easy.
The Easiest Way to Convert Any Video to MP4 Format
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The Best Way to Convert FLV to MP4 for Free
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Two Ways to Convert AVI to MP4 on Windows and Mac
Your devices can't support AVI video? Just need MP4? Here we introduce an effective way to convert AVI to MP4 easily.
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