Online WEBM to MKV converter | Free GroupDocs Apps

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Convert WEBM to MKV

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We have already processed 5,838,576 files with total size of 9,548,311 Mbytes

Convert WEBM to MKV files online with our free video converter app. No matter your platform — Windows 10, Mac or iPhone — you can convert WEBM audio files with any resolution rapidly.

The most popular video formats are MP4, AVI, MKV, and MOV. MP4 is the most widely supported, balancing quality and file size, while AVI and MKV offer flexibility for high-quality playback, and MOV is optimized for Apple devices. Video files can be edited using video editing software such as Adobe Premiere Pro, Final Cut Pro, or DaVinci Resolve.

Change WEBM to MKV in seconds — drop your file into the upload form, pick MKV as the output, and hit Convert. Download the result video file right after conversion.

Check our video

WEBM

WEBM file format

WEBM is an open, royalty-free multimedia container format designed for web use, primarily for video and audio streaming. It is widely supported by modern web browsers, media players like VLC, and editing tools such as Adobe Premiere Pro and FFmpeg. The format uses VP8 or VP9 video codecs and Opus or Vorbis audio codecs, offering efficient compression, high-quality playback, and features like adaptive streaming and metadata support.

MKV

Matroska Video file format

MKV (Matroska Video File) is an open, flexible multimedia container format designed to store video, audio, subtitles, and metadata in a single file. It is widely supported by media players like VLC, MPC-HC, and tools such as MKVToolNix for editing and muxing. The format uses EBML (Extensible Binary Meta Language) for its structure, enabling advanced features like chapter support, multiple audio tracks, and seamless streaming capabilities.

How it works

How to convert WEBM to MKV

Step 1

Click inside the file drop area to upload WEBM file or drag & drop WEBM file.

Step 2

Click on Convert button. Your WEBM files will be uploaded and converted to MKV result format.

Step 3

Download link of result files will be available instantly after conversion.

Step 4

You can also send a link to the MKV file to your email address.

FAQ

Questions & Answers

Is it safe to use this tool for WEBM to MKV conversion?

Definitely! Your files remain private and secure. The download link is provided instantly after conversion, and all uploaded files are deleted automatically after 24 hours to ensure your data stays protected.
Can I use an API to convert WEBM files programmatically?

Yes! The GroupDocs.Conversion API provides seamless document conversion support for .NET, Java, Python, and Node.js, making integration easy for developers.
Which web browsers support WEBM conversion?

Our WEBM converter is compatible with all major browsers like Google Chrome, Firefox, Opera, and Safari. Any up-to-date browser will work perfectly.
How long do my WEBM files stay on your servers?

We store your files for 24 hours, after which they are automatically erased from our system.
How do I retrieve my converted WEBM file?

At the end of the conversion, you’ll get a direct download link. You can either download the file immediately or email the link to yourself for convenience.

Other Supported Conversions

You can also convert WEBM into many other file formats. Please see the complete list below.

WEBM TO MP4
MPEG-4 file format
WEBM TO AVI
Avi file format
WEBM TO MOV
QuickTime file format
WEBM TO WEBM
WEBM file format
WEBM TO WMV
WMV file format
WEBM TO MP3
MP3
WEBM TO AAC
Advanced Audio Coding
WEBM TO FLAC
Free Lossless Audio Codec
WEBM TO M4A
M4A file format
WEBM TO WMA
WMA file format
WEBM TO OGG
OGG file format
WEBM TO WAV
WAV file format

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