MP4 to WEBM Converter
Smaller, royalty-free video for the web. Drop a MP4 file below — the whole conversion runs on your device.
Drop files, or click to browse
MP4 files only — processed one at a time
Frequently asked questions
Is this MP4 to WEBM converter free?+
Yes, with no watermark and no account. The engine runs locally in your browser, so there's no server queue limiting usage.
Is my video uploaded to a server?+
No. Orbfile uses your browser's own built-in media codecs (via the WebCodecs API and Mediabunny), so encoding happens entirely on your device.
How long will it take?+
It depends on your device and the video's length and resolution — expect roughly real-time to a few times real-time for typical clips.
Is there a maximum file size?+
There's no fixed upload limit — since everything runs on your device, the practical limit is your browser's available memory, which handles typical clips and even fairly long recordings without issue.
How do I convert MP4 to WEBM?+
Drop your MP4 file into the box above — Orbfile re-encodes it to WEBM using your browser's own codecs and gives you a download link when it's done.
About MP4 and WEBM
What is MP4?
MP4 (usually carrying H.264 video) is the most widely compatible video container — it plays on essentially every phone, browser, and TV.
Full MP4 format guide →What is WEBM?
WEBM is an open, royalty-free video format built for the web, typically using the VP9 codec for strong compression at small sizes.
Full WEBM format guide →The short version: WEBM gives you excellent compression for web delivery, which helps once you run into MP4's biggest limitation: not the smallest option available for the same visual quality. It's a natural move when your video is headed toward embedding video on websites.
How it works
- 1
Drop your file in
Drag your video onto the box above, or click it to browse — there's no account to create and no upload to wait on.
- 2
Pick your settings
The output format is already set for this page — just adjust any extra options shown, if there are any.
- 3
Download the result
Your browser processes everything locally and hands you a download link the moment it's done — nothing was ever sent to a server.
Is it private?
Everything happens locally, inside this browser tab. Your video is read from disk, processed with WebAssembly running on your own device, and handed back to you as a download — it's never transmitted anywhere, so there's nothing to intercept and nothing stored on a server.
Common use cases
- Embedding video on websites
- Keeping page load times low
- Uploading a clip to social media
- Sending a video over email or chat
Supported formats
This is one of many pairings the video toolkit handles. In total it covers:
Related conversions
Format details
About MP4 files+
MP4 (usually carrying H.264 video) is the most widely compatible video container — it plays on essentially every phone, browser, and TV.
MP4 is a container format standardized under MPEG-4, meaning the file itself is really a wrapper that most often holds H.264-encoded video alongside AAC audio. That specific combination struck a balance efficient enough for streaming and broad enough to be adopted everywhere, which is why it's the format cameras, phones, editors, and social platforms converge on as a safe default. It isn't always the smallest or most efficient option available — newer codecs inside newer containers can do better — but nothing beats it for guaranteed playback.
How to open a MP4 file
Opens readily in Any web browser, Any modern phone, TV, or media player. For real editing, use Adobe Premiere Pro, DaVinci Resolve, iMovie.
Good for
- maximum device and platform compatibility
- good compression-to-quality ratio
Watch out for
- not the smallest option available for the same visual quality
About WEBM files+
WEBM is an open, royalty-free video format built for the web, typically using the VP9 codec for strong compression at small sizes.
Google introduced WebM alongside WebP as a royalty-free alternative built specifically for the browser, most commonly pairing the VP9 (or newer AV1) video codec with Opus audio in a lightweight container. That combination tends to compress noticeably better than the more universally-compatible H.264/MP4 pairing, which is why WebM shows up heavily in web video embeds and platforms like YouTube use it internally, even when they serve MP4 for broader device compatibility.
How to open a WEBM file
Opens readily in Chrome, Firefox, Edge (native), VLC Media Player. For real editing, use DaVinci Resolve, Adobe Premiere Pro (with an extension).
Good for
- excellent compression for web delivery
- royalty-free, no licensing overhead
Watch out for
- less commonly used than MP4 outside web contexts
Need a different format? Try the full Video Converter, or explore all video tools.