Convert MKV to WebM for Web Embedding

Convert your Matroska Video files to WebM (VP9) online for free. MKV is not supported on most mobile devices, social platforms, or major streaming sites — WebM solves that. No registration, no watermarks, instant download.

Drag & drop your file here, or

Max 100 MB • Max 10 min duration • Max 1080p

How to Convert MKV to WebM — 3 Steps

FFmpeg re-encodes your MKV file to VP9 WebM — web embedding.

  1. Upload your MKV file

    Select your MKV file from downloaded movies. Files up to 100 MB and 10 minutes in duration are accepted.

  2. Confirm and convert

    Confirm you own the file and click Convert to WebM. Processing typically completes in under 60 seconds.

  3. Download your WebM file

    Download your WebM immediately — ready to chrome, firefox, and edge play webm without extra codecs or plugins.

Why Convert MKV to WebM?

MKV (Matroska Video) is not supported on most mobile devices, social platforms, or major streaming sites. Converting to WebM gives you web native and html5 video.

Web nativeChrome, Firefox, and Edge play WebM without extra codecs or plugins
HTML5 videoWebM is the preferred format for HTML5 <video> elements
Open sourceVP9 codec is royalty-free with no licensing concerns
QualityVP9 achieves similar quality to H.264 at roughly half the bitrate
YouTubeYouTube stores and streams video internally using VP9/WebM
TransparencyWebM supports alpha channel video for overlays and compositing

Frequently Asked Questions

Why convert MKV to WebM?

MKV (Matroska Video) is not supported on most mobile devices, social platforms, or major streaming sites. Converting to WebM gives you chrome, firefox, and edge play webm without extra codecs or plugins.

Will I lose video quality converting MKV to WebM?

Our converter outputs VP9 video at high-quality settings. When re-encoding is required, we use settings that minimise visible artefacts. The resulting WebM file will be visually very close to the original.

What MKV files can I upload?

You can upload MKV files from downloaded movies, anime, multi-language content, and remuxed Blu-ray rips. Files must be under 100 MB, under 10 minutes in duration, and not exceed 1080p resolution.

What is the maximum file size for MKV to WebM conversion?

The maximum upload size is 100 MB and the maximum video duration is 10 minutes. Resolution is capped at 1920×1080 (1080p).

Is my MKV file kept private?

Yes. Files are processed privately and automatically deleted within 60 minutes. We never store, sell, or analyse your content.

MKV & WebM Format Guides

Understand the formats you're converting between — specs, pros, cons, and use cases.

What is MKV?Full guide — technical specs, pros, cons, and compatible softwareWhat is WebM?Full guide — technical specs, pros, cons, and compatible softwareAll Format GuidesBrowse all 14 video and audio format guides

All the tools a content creator needs, in one place.

Convert VideoConvert to any format — MP4, WebM, MKV, AVI, and moreCompress MP4Reduce MP4 file size by up to 70%Video to MP3Extract MP3 audio from any video fileExtract AudioSave audio as MP3, WAV, FLAC, or AAC