Convert MP4 to WebM Free for Web Delivery

Convert MP4 to WebM for free and get a web video file for HTML5 pages, with sound included. Add one clip or a batch, up to 1 GB each. Your videos stay on your device.

Drop your video files here

MP4

Choose videos

Max file size: 1 GB · Multiple files supported

How to Convert MP4 to WebM

Add your MP4 clips.

Drag them onto the box above or tap Choose videos. Each file must end in .mp4 and be 1 GB or smaller, and you can add several.

Pick a bitrate if needed.

WebM is already chosen for every file. Auto uses a quality setting capped at 4,000 kbps, and a fixed rate from 500 to 16,000 kbps sets the size. Press Convert All.

Download the WebM files.

Use the button on each file, or Download All for a ZIP once two or more are done. Keep the tab open while long clips encode.

MP4 vs WebM: What Changes

Understanding the differences between MP4 and WebM helps you choose the right format for your needs.

Specification	MP4	WebM
Compression	Lossy	Lossy
Quality	Good to Excellent	Good to Excellent
Transparency	No	No
Animation	Yes	Yes
File Size	Small to Medium	Small to Medium

Why convert from MP4?

Lossy compression
Patent-encumbered codecs
Limited editing flexibility

Why choose WebM?

Royalty-free and open-source
Excellent support in Chrome, Firefox, and Edge
Good compression with open video codecs

When to use MP4

When you need universal video compatibility and efficient streaming.

When to use WebM

When embedding video on the web and you need a royalty-free format with strong browser support.

What This Free MP4 to WebM Converter Does

It re-encodes each MP4 into a WebM file for the web. Convert one clip or a batch and set a bitrate if you like, with no sign-up.

MP4 to WebM result: hero-loop.mp4 shrinks from 14.45 MB to 4.95 MB and keeps its 1280 × 720 size, 30 fps and sound

Convert MP4 to WebM for the Web

Each MP4 is fully re-encoded into a WebM file with picture and sound, ready for an HTML5 video tag. It plays in Chrome, Firefox and Edge; keep an MP4 copy for older Safari.

Takes .mp4 videos up to 1 GB
Video and sound in one .webm
Keeps width, height and frame rate

Try now

Batch MP4 to WebM: three clips encode one at a time, one done, one at 37%, one waiting, then saved as pixconvert-batch.zip

Batch Convert MP4 to WebM Files

Queue several MP4 clips and press Convert All. They encode one at a time with a percent counter on each, and Download All gathers two or more WebM files into one ZIP.

Any number of clips per batch
Percent progress on every file
Download All builds one ZIP

Try now

Slower Than Other Formats

WebM encoding is heavy work for a browser. In a test of the same engine on a laptop, a 10-second 720p clip took about 90 seconds, roughly twice as long as the same clip saved as MOV.

MP4 to WebM Conversion FAQs

Answers on codecs, browser support, speed and settings when you convert MP4 to WebM.

How do I convert MP4 to WebM for free?

Choose your .mp4 clips or drop them on the box. WebM is preselected. Press Convert All, wait until every tile reaches 100%, then download the files one by one or as a ZIP. No account or fee is involved. Files added later with Add More Files start as MP4, so switch them to WebM first.

Should I use WebM or MP4 on my website?

Use both if you can. WebM is royalty-free and plays in Chrome, Firefox and Edge, while MP4 with H.264 plays almost everywhere, including older Safari and iPhones. Put the WebM source first in your video tag and the MP4 second as the fallback.

Which codecs does this MP4 to WebM converter use?

The picture is encoded as VP8 and the sound as Vorbis, both inside a standard .webm file that WebM-capable browsers play. VP9 isn't offered. In our test, a 720p clip came out at 4.95 MB as WebM and 4.70 MB as MOV.

Does Safari play WebM files?

Recent Safari versions on Mac can play WebM, but older Safari versions and some iPhones and iPads cannot, and support differs by version. If your viewers use Apple devices, keep an MP4 copy and list it as the fallback source next to the WebM.

What settings can I change when converting MP4 to WebM?

You get Bitrate, Frame rate and Remove audio, applied to the whole batch. Auto uses a quality setting capped at 4,000 kbps, while presets from 500 to 16,000 kbps set a target bitrate instead. Frame rate offers 24, 25, 30, 48 or 60 fps. Resolution can't be changed.

Why is MP4 to WebM conversion so slow?

WebM encoding takes a lot of work, and here it runs on your own processor, one file at a time. In a test of the same engine on a laptop, a 10-second 720p clip took about 90 seconds, double the MOV time for the same clip. Long or 4K videos can take many minutes.

Will WebM make my video file smaller?

Not always. The size depends on the source and the bitrate you choose. In our test a high-bitrate 14.45 MB 720p MP4 became a 4.95 MB WebM, but an MP4 that is already small can come out bigger. Pick a lower bitrate, such as 1,000 kbps, for a smaller file.

Can I make a WebM with no sound for a background video?

Yes. Open the Video settings group and switch on Remove audio before you press Convert All. The WebM is then saved with only the picture, which suits muted autoplay loops on a web page. The switch applies to every file in the batch.

Why did my MP4 fail to convert to WebM?

Make sure the file ends in .mp4 and is no bigger than 1 GB, since other files are refused at the start. A damaged video, or a long high-resolution one that uses up browser memory, shows an error on its tile. Tap retry on that file; the rest of the queue carries on.

Is my video private when I convert MP4 to WebM here?

Yes. The WebM is made inside your browser tab, and your clip is not sent to our servers. The tab does download a 32 MB video engine from unpkg, a public file host, and we record usage such as page views and time in the editor, never the video or its name.