MP4 to WebM Converter

Convert MP4 to WebM Online for Free

How to Convert MP4 to WebM?

It is easy to convert MP4 videos to WebM format with AhaConvert. WebM is a lightweight (much smaller than MP4), web-friendly format widely used for online streaming, embedding, and fast-loading video playback. No software installation or signup needed. AhaConvert works directly in any browser on Windows, macOS, Android, and iPhone. Just go through the process below to start your conversion.

Upload MP4 Video

Upload your MP4 video file from a local device.

Select WebM Format

Select WebM as the target video format.

Download WebM File

Download the WebM video file once the conversion is complete.

Supported Video Converters

WebM converters

Apart from MP4, AhaConvert supports transforming various other video and audio formats to WebM. Browse the specific WebM converters listed below.

GIF to WEBM

MOV to WebM

Video to WebM

MKV to WebM

AVI to WebM

WMV to WebM

FLV to WebM

M4V to WebM

OGG to WebM

MPG to WebM

3GP to WebM

TS to WebM

VOB to WebM

3G2 to WebM

DVR to WebM

M2TS to WebM

MTS to WebM

MXF to WebM

WTV to WebM

DV to WebM

RM to WebM

RMVB to WebM

SWF to WebM

MOD to WebM

MP4 converters

Besides converting MP4 to WebM, AhaConvert also supports MP4 conversion to many other video formats. Check out the MP4 to video converters listed below.

MP4 to MP3

MP4 to GIF

MP4 to WAV

MP4 to MOV

MP4 to Video

MP4 to AVI

MP4 to WMV

MP4 to OGG

MP4 to MKV

MP4 to M4A

MP4 to Audio

MP4 to 3GP

MP4 to MPG

MP4 to FLV

MP4 to FLAC

MP4 to M4V

MP4 to VOB

MP4 to AAC

MP4 to OPUS

MP4 to MP2

MP4 to TS

MP4 to M4R

MP4 to SWF

MP4 to WMA

MP4 to AIFF

MP4 to MXF

MP4 to AMR

MP4 to RMVB

MP4 to 3G2

MP4 to M4B

MP4 to M2TS

MP4 to DVR

MP4 to ALAC

MP4 to RM

MP4 to DV

MP4 to MOD

MP4 to WTV

MP4 to AIF

MP4 to OGA

MP4 to CAF

MP4 to MTS

MP4 to 3GA

MP4 to AIFC

Frequently Asked Questions

Changing MP4 to WebM is useful when you are preparing videos for websites, online apps, or platforms that give priority to fast loading and bandwidth savings. WebM is an open-source video file format, specifically designed for the web. It uses modern codecs like VP8, VP9, or AV1 that keep the video size small at good visual quality.

If you’re a developer, marketer, or content creator adding videos to a web page, switching from MP4 to WebM can greatly boost page load speeds, user experience, and even search ranking, particularly on Chrome, Firefox, and other modern browsers.

Absolutely. One of the biggest advantages of converting to WebM is that it reduces the size of the original MP4 file significantly. This is due to the more advanced compression algorithms used in WebM, which remove extra unnecessary video data without affecting quality that much.

If you are hosting a great number of videos online or trying to serve content as fast as possible to viewers with slow connections, WebM allows you to deliver full HD video with no excessive use of storage or bandwidth. For this reason, many platforms adopt WebM behind the scenes, including background videos, ads, and embedded media.

Although most modern browsers, including Chrome, Edge, Firefox, and Opera, support WebM without problems, it is not fully supported by older browsers, devices, or the default iPhone video player. Support in Safari on macOS and iOS, for example, is limited, unless the user installs a compatible browser or application.

So, if your goal is broad device playback, then MP4 may still be more reliable. But for purely web-based use, WebM offers better performance and a smaller file footprint.

Yes. As we explained in previous questions, WebM was built for this very purpose. It helps the page load faster, reduces buffering, and improves playback responsiveness. Google even recommends WebM for web performance and pages with autoplay video backgrounds or other interactive elements. If you’re optimizing for Core Web Vitals, switching MP4 to WebM can make a visible difference in both speed and user experience.

Yes, you can convert long MP4 videos, full-length movies, screen recordings, or HD footage to WebM with an online tool like AhaConvert. The upload time depends on your connection, but once converted, the WebM version of your video will be much smaller and more convenient to store, share, or embed.

Yes. AhaConvert lets you convert MP4 to WebM completely free in your browser. There is no signup, no subscription, and no hidden watermarks for simple conversions. Just upload your MP4 file and download the WebM version once it’s ready. That’s it.

Absolutely. All the video files, whether uploaded or downloaded, are kept safe during processing. We use 256-bit SSL encryption, store files in a secure cloud environment, and automatically delete them within 24 hours.

Explore More File Converters

File convert tools

Unable to find the format you need? AhaConvert also provides these free online file converters:

Video Format

Image Format

Audio Format

Document Format

Security and Privacy

At AhaConvert, your files are protected with enterprise-grade security. We use 256-bit SSL encryption during transfer, store your data in a secure cloud environment, and guarantee automatic deletion within 24 hours. We fully respect your privacy – we will not view or share your files under any circumstances. Make sure your files are protected at every step, from upload to conversion.

SSL encrypted transmission

Automatically deleted within 24 hours

Privacy protection

Secure cloud storage