WebM video
An open media container designed for efficient browser playback.
Best for web video and open media pipelines.
WEBM to MKV
Converts WEBM video to MKV. MKV can hold several audio and subtitle tracks. Add your files, convert them in one batch, and download each MKV directly.
1-hour guest cleanupMalware scanned2 at once, 10 per day
How to convert WEBM to MKV
The converter runs in your browser and an isolated processing queue. Nothing to install, and every upload is scanned for malware before it is processed.
- 1Add your WEBM filesDrop WEBM files into the converter or choose them from your device. Guest files can be up to 15 MB each.
- 2Choose MKVSet MKV as the output for the whole batch, then change individual files if needed.
- 3Convert and downloadStart the batch and download each MKV directly, or save it to your workspace to get a permanent link.
Matroska video
A flexible open container that can hold video, audio, and subtitles.
Best for high-quality media libraries and multi-track video.
WEBM to MKV
What to expect from WEBM to MKV
What changes in the file, and what to check before you share the result.
Why MKV
MKV can hold several audio and subtitle tracks. Some phones and browsers do not play it without extra software.
Guest size limit
Guest video conversions are limited to 15 MB per file. Sign in to a free account for larger videos.
Starting from WEBM
WebM files usually come from browsers, screen recorders, or web downloads.
WEBM to MKV questions
Short answers about limits, privacy, and keeping the converted file.
Is the WEBM to MKV converter free?
Yes. Without an account you can convert up to 10 files a day, 2 at a time, up to 15 MB each. A free account adds monthly conversion credits and larger files.
How long are my files kept?
Guest uploads and results are deleted automatically after 1 hour. Conversions stay temporary when you are signed in too, unless you save a result to your workspace.
Can I get a permanent link to the MKV file?
Yes. Save the result to a SteadyLink workspace and it gets a stable link. If you make a new version later, replace the file and the link stays the same.
Browse by file type
Each category has its own converter, format list, and common routes.
Images
JPG, PNG, WebP, AVIF, GIF, TIFF, BMP, HEIC, ICO, SVG
Documents
DOC, DOCX, ODT, RTF, TXT, HTML, PDF
Spreadsheets
XLS, XLSX, ODS, CSV, PDF
Presentations
PPT, PPTX, ODP, PDF
PDF, DOCX, JPG, PNG, TXT
Audio
MP3, WAV, AAC, FLAC, OGG, M4A, Opus
Video
MP4, WebM, MOV, AVI, MKV, GIF, MP3
Archives
ZIP, TAR, TAR.GZ, 7Z
Ebooks
EPUB, MOBI, AZW3, PDF, TXT
Keep the useful ones.
Conversions remain temporary even when you are signed in, so save a result to your workspace when you want a stable URL and revision history.
Open a workspacecampaign-hero.webpReady to download
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