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WEBM to MKV Converter
Convert WEBM files to MKV in seconds, free and unlimited.
🔒 Files are processed on your device. Nothing is uploaded.
How to convert WEBM to MKV
- Click Choose files or drop your WEBM files into the box. You can add several at once.
- Make sure MKV is selected as the output format.
- Press Convert, then download your MKV files.
WEBM
Open web video format from Google (VP8/VP9 video), playable in all modern browsers.
MKV
Matroska container that can hold almost any codec, many audio tracks and subtitles.
Video and audio are converted with FFmpeg running inside your browser. Short clips finish in seconds; long or high-resolution videos can take a few minutes because your own device does the work. Open Options to trim, resize or change quality.
Other WEBM conversions
- WEBM to MP4
- WEBM to MOV
- WEBM to AVI
- WEBM to FLV
- WEBM to WMV
- WEBM to MPEG
- WEBM to 3GP
- WEBM to OGV
- WEBM to M4V
- WEBM to TS
- WEBM to GIF
- WEBM to MP3
- WEBM to WAV
- WEBM to OGG
- WEBM to OPUS
- WEBM to FLAC
- WEBM to AAC
- WEBM to M4A
- WEBM to M4R
- WEBM to WMA
- WEBM to AC3
- WEBM to AIFF
Convert other files to MKV
- GIF to MKV
- MP4 to MKV
- MOV to MKV
- AVI to MKV
- FLV to MKV
- WMV to MKV
- MPEG to MKV
- MPG to MKV
- M4V to MKV
- 3GP to MKV
- 3GPP to MKV
- 3G2 to MKV
- OGV to MKV
- TS to MKV
- MTS to MKV
- M2TS to MKV
- VOB to MKV
- MXF to MKV
- DV to MKV
- MOD to MKV
- RM to MKV
- RMVB to MKV
FAQ
Is converting WEBM to MKV free?
Yes. Unlimited conversions, no sign-up, no watermark.
Are my files uploaded to a server?
No. FieldConvert processes files inside your browser, so your WEBM files never leave your device. That makes it private and fast, because there is no upload or download wait.
Is there a file size limit?
Only your device's memory. Files up to about 2 GB work in most desktop browsers.