Convert MKV to MP4 online with Vimeo

Upload MKV files to Vimeo and get a compressed MP4 with H.264 video compression, adaptive streaming across every device, and a downloadable MP4 you can use anywhere. Vimeo works as an MKV to MP4 converter that runs the compression during upload processing, no software install required.
Get started for free

You're in great company

MKV files don't play everywhere

  • Limited browser support

    Safari and iOS don't play MKV natively; some other browsers require codec setup.

  • Mobile playback gaps

    Android and iOS default video apps often can't open MKV files without a third-party player.

  • Larger, less predictable files

    MKV containers can hold uncommon codec combinations that further limit playback.

MKV (Matroska Video) is a flexible container popular for high-quality video files, particularly for archived or edited content. The trade-off is compatibility: MKV doesn't play natively in Safari, on most iOS devices, or in some Windows browsers without a codec pack. When you need the video to reach a broader audience, MP4 is the format that plays everywhere.

Upload MKV, get MP4 playback and download

Upload an MKV file to Vimeo and the platform transcodes the source to an MP4 with H.264 video and AAC audio. That codec pair plays on every modern browser, phone, and connected TV, and H.264 usually produces a smaller MP4 than the MKV source. You get an ad-free player, a shareable link, and a downloadable compressed MP4 with no watermark on any plan, including Free.
Get started now

Automatic MKV to MP4 conversion

Transcode and compression run during upload processing on paid accounts.

H.264 and AAC output

Compatible with Chrome, Safari, Firefox, iOS, Android, and most connected TV devices.

Downloadable compressed MP4

Save the converted file for reuse in another editor, LMS, or platform.

No watermark on the output

The MP4 file plays and downloads completely clean, making it immediately ready for you.

After MKV conversion, play the MP4 with adaptive streaming

Vimeo generates a full ladder of renditions from your MKV source, up to 8K HDR when it supports it, down to a mobile-friendly 360p at the bottom. The player picks the right rendition per viewer, so playback stays smooth across devices and connections. Embed with a responsive iframe, share the link, or download the MP4 to reuse in another editor or LMS.
Try now

Up to 8K HDR quality

Hosting supports the highest resolutions when the MKV source supports them.

Adaptive bitrate per viewer

The player switches tiers based on connection conditions.

Ad-free playback on every plan

No pre-rolls, mid-rolls, or external recommendations on any tier.

Responsive player embedding

Embed the player using responsive iframes that dynamically resize to look great on any website builder or screen size.

Trusted by marketers, businesses, and video pros around the globe

  • 100+ billion

    video views (and counting)

  • 7+ million

    videos uploaded every month

  • 4+ billion

    minutes streamed each month

Why convert a video from MKV to MP4

MKV is a strong archival and editing container, but MP4 is the delivery format. Converting MKV to MP4 through H.264 compression makes the video playable on every device, smaller in file size, and easier to embed. For teams uploading many MKV files, Vimeo's bulk operations and public API convert whole catalogs to MP4 without a separate desktop converter.

  • Universal playback

    MP4 plays on every device without extra software.

  • Smaller file sizes through MP4 compression

    H.264 compression typically shrinks the file compared to the equivalent MKV container.

  • Web-ready by default

    Embed and share on any surface without playback issues.

  • iframe embed everywhere

    Works on WordPress, Squarespace, Webflow, Ghost, HubSpot, and any custom site.

  • Shareable link

    Paste into email, chat, or a doc.

  • Downloadable MP4

    Use the converted file wherever else you need the video.

  • Batch upload and process

    Process many MKV uploads in batch, with the same H.264 compression applied to every file.

  • API-driven conversion

    Automate uploads and compression from your production pipeline.

  • Stable URLs through replacements

    Replace files without breaking existing embeds.

How to convert MKV to MP4 with Vimeo

Converting MKV to MP4 on Vimeo runs as part of the upload flow. Upload the MKV file, let Vimeo transcode, and share, embed, or download the result. Here's how.

  1. Step 1

    Sign in to Vimeo (Free or paid account works).

  2. Step 2

    Click 'New video' then upload the MKV file.

  3. Step 3

    Wait for processing; the MP4 renditions generate automatically.

  4. Step 4

    Open the video's settings and download the MP4 from the 'Video file' menu, or copy the share link, or grab the iframe embed.

  5. Step 5

    Download the MP4 video, embed on your site, or share the link.
Get started now

Find the right plan for you

    Vimeo offers discounts to US-based non-profit organizations and educational institutions. Learn more.

    For more information on feature availability, please reference our pricing page.

    Frequently asked questions about converting MKV to MP4

    Yes. The Free plan accepts MKV uploads and produces MP4 playback with 1 GB of total account storage. Paid plans add more storage, auto-captions in 99 languages, custom branding, and analytics. The conversion itself doesn't cost extra on any tier.

    Go to the Help Center
    More to explore
    1/9