Convert MP4 to WEBM

Convert MP4 to WEBM online for free. The video is processed with FFmpeg on a secure server and deleted automatically.

Your file is deleted automatically after conversion.

How to convert MP4 to WEBM

WebM (VP9 + Opus) is the open web video format, compact and ideal for embedding on websites. This converter uses FFmpeg, the engine behind VLC, YouTube and most video software, to turn your MP4 into WEBM with sensible, high-quality settings chosen automatically. No codecs to pick, no software to install.

Step 1: Choose your MP4 file
Drag and drop a .mp4, .m4v file onto the converter or click to browse. It works on desktop, tablet and phone.
Step 2: Convert on the server
The MP4 is uploaded over HTTPS and converted by FFmpeg in an isolated folder.
Step 3: Download the WEBM
Save the WEBM file to your device. You can start again with another file right away.

Good to know

This server-based video conversion accepts files up to 100 MB. Longer videos take more time, so keep the tab open.

Why use this MP4 to WEBM converter?

WebM (VP9 + Opus) is the open web video format, compact and ideal for embedding on websites.
Automatic, high-quality settings.
No watermark and no signup.
Files are deleted automatically after conversion.

Is it free?

Yes. Converting MP4 to WEBM is free, with no watermark, signup or email required. Local conversions have no artificial file-size or daily cap; the practical limit is your device. This server-based conversion accepts files up to 100 MB.

Is my file uploaded?

This conversion needs a server engine, so the file is uploaded over an encrypted HTTPS connection, converted in an isolated temporary folder and deleted automatically as soon as the result is sent back. Nothing is kept, logged or shared.

About the formats

What is MP4?

MP4 (MPEG-4 Part 14) is a container format standardised by ISO and derived from Apple's QuickTime format. It is not a codec itself: it usually holds H.264 or H.265 (HEVC) video and AAC audio, and can also carry subtitles, chapters and metadata. The .m4v extension is a variant used mainly by Apple. MP4 plays on practically every phone, computer, smart TV and browser.

Use MP4 whenever you want a video to play everywhere: sharing with others, uploading to social networks or embedding on a website. With H.264 inside it offers the best compatibility; H.265 gives smaller files but is not supported by every device.

MP4 (MPEG-4 Part 14)

What is WEBM?

WebM is an open, royalty-free media format launched by Google in 2010 and based on the Matroska container. It carries VP8, VP9 or AV1 video with Vorbis or Opus audio, all free of licensing fees. Chrome, Firefox, Edge and other modern browsers play it natively, and it supports transparency with VP8 and VP9.

Use WebM for videos embedded on websites, screen recordings and animations with transparent backgrounds. For sharing with people who will open the file on phones, TVs or editing software, MP4 is more widely supported.

WebM (Web Media)

Frequently Asked Questions

Is MP4 to WEBM conversion free?

Yes. It is free, with no watermark, signup or email required. Local conversions have no artificial file-size or daily cap; the practical limit is your device. This server-based conversion accepts files up to 100 MB.

How long does it take?

Repackaging is almost instant. Re-encoding typically takes between a few seconds and a couple of minutes, depending on the length and resolution of the video.

Is it safe to convert mp4 to webm here?

Yes. The upload is encrypted, the file lives only in a temporary folder during conversion and it is deleted automatically afterwards. We do not read, keep or share your files.

Do I need to install anything?

No. Everything runs in a modern browser (Chrome, Edge, Firefox or Safari) on Windows, macOS, Linux, Android and iOS. There is no app, plugin or account.

Can I convert WEBM back to MP4?

Yes, there is a dedicated WEBM to MP4 converter linked in the related tools below. Keep in mind that information dropped in one direction cannot always be restored in the other.

Need the opposite? Convert WEBM to MP4

Video