Free MKV video converter

Convert MKV to MP4

Convert MKV videos to MP4 for free, right in your browser. Upload a .mkv file, pick MP4 from the output menu and download the converted video. Everything is re-encoded locally — no uploads, no accounts, no watermarks.

Checking browser support…

What is MKV to MP4 conversion?

Matroska (MKV) and MPEG-4 (MP4) are two popular video containers, but not every player or editor handles them all. This free converter reads your .mkv file, decodes its streams and re-encodes them into a valid .mp4 file with widely supported codecs. The whole conversion runs in your browser, so your video stays private.

How it works

1Upload a .mkv video file.
2Choose MP4 from the output format menu.
3Click Download — the video is re-encoded locally in your browser.
4Save the converted .mp4 file. No signup needed.

Why this tool

100% private. The conversion runs entirely in your browser. Your video is never uploaded to a server.
Free, no signup. No accounts, no watermarks, no file size limits. Convert as many videos as you like.
7 output formats. Pick AVI, FLV, MKV, MOV, MP4, WebM or WMV from the dropdown when you download.

Frequently asked questions

Is converting MKV to MP4 free?

Yes. This tool is completely free with no limits, watermarks or sign-up requirements.

Are my videos uploaded to a server?

No. The conversion happens entirely in your browser with ffmpeg.wasm, so your MKV file never leaves your device.

How do I convert MKV to MP4?

Upload a .mkv file, choose MP4 from the output menu, click Download and wait for the local re-encode to finish.

What output formats can I choose?

AVI, FLV, MKV, MOV, MP4, WebM, WMV — the dropdown next to Download switches between them.

Extract Audio from Video Convert 3G2 to AVI Convert 3G2 to FLV Convert 3G2 to MKV Convert 3G2 to MOV Convert 3G2 to MP4 Convert 3G2 to WebM Convert 3G2 to WMV Convert 3GP to AVI Convert 3GP to FLV Convert 3GP to MKV Convert 3GP to MOV Convert 3GP to MP4 Convert 3GP to WebM Convert 3GP to WMV Convert 3GPP to AVI Convert 3GPP to FLV Convert 3GPP to MKV Convert 3GPP to MOV Convert 3GPP to MP4 Convert 3GPP to WebM Convert 3GPP to WMV Convert AVI to FLV Convert AVI to MKV Convert AVI to MOV Convert AVI to MP4 Convert AVI to WebM Convert AVI to WMV Convert DV to AVI Convert DV to FLV Convert DV to MKV Convert DV to MOV Convert DV to MP4 Convert DV to WebM Convert DV to WMV Convert FLV to AVI Convert FLV to MKV Convert FLV to MOV Convert FLV to MP4 Convert FLV to WebM Convert FLV to WMV Convert M2TS to AVI Convert M2TS to FLV Convert M2TS to MKV Convert M2TS to MOV Convert M2TS to MP4 Convert M2TS to WebM Convert M2TS to WMV Convert M4V to AVI Convert M4V to FLV Convert M4V to MKV Convert M4V to MOV Convert M4V to MP4 Convert M4V to WebM Convert M4V to WMV Convert MKV to AVI Convert MKV to FLV Convert MKV to MOV Convert MKV to WebM Convert MKV to WMV Convert MOV to AVI Convert MOV to FLV Convert MOV to MKV Convert MOV to MP4 Convert MOV to WebM Convert MOV to WMV Convert MP4 to AVI Convert MP4 to FLV Convert MP4 to MKV Convert MP4 to MOV Convert MP4 to WebM Convert MP4 to WMV Convert MPEG to AVI Convert MPEG to FLV Convert MPEG to MKV Convert MPEG to MOV Convert MPEG to MP4 Convert MPEG to WebM Convert MPEG to WMV Convert MPG to AVI Convert MPG to FLV Convert MPG to MKV Convert MPG to MOV Convert MPG to MP4 Convert MPG to WebM Convert MPG to WMV Convert MTS to AVI Convert MTS to FLV Convert MTS to MKV Convert MTS to MOV Convert MTS to MP4 Convert MTS to WebM Convert MTS to WMV Convert MXF to AVI Convert MXF to FLV Convert MXF to MKV Convert MXF to MOV Convert MXF to MP4 Convert MXF to WebM Convert MXF to WMV Convert OGG to AVI Convert OGG to FLV Convert OGG to MKV Convert OGG to MOV Convert OGG to MP4 Convert OGG to WebM Convert OGG to WMV Convert OGV to AVI Convert OGV to FLV Convert OGV to MKV Convert OGV to MOV Convert OGV to MP4 Convert OGV to WebM Convert OGV to WMV Convert RM to AVI Convert RM to FLV Convert RM to MKV Convert RM to MOV Convert RM to MP4 Convert RM to WebM Convert RM to WMV Convert RMVB to AVI Convert RMVB to FLV Convert RMVB to MKV Convert RMVB to MOV Convert RMVB to MP4 Convert RMVB to WebM Convert RMVB to WMV Convert SWF to AVI Convert SWF to FLV Convert SWF to MKV Convert SWF to MOV Convert SWF to MP4 Convert SWF to WebM Convert SWF to WMV Convert TS to AVI Convert TS to FLV Convert TS to MKV Convert TS to MOV Convert TS to MP4 Convert TS to WebM Convert TS to WMV Convert VOB to AVI Convert VOB to FLV Convert VOB to MKV Convert VOB to MOV Convert VOB to MP4 Convert VOB to WebM Convert VOB to WMV Convert WebM to AVI Convert WebM to FLV Convert WebM to MKV Convert WebM to MOV Convert WebM to MP4 Convert WebM to WMV Convert WMV to AVI Convert WMV to FLV Convert WMV to MKV Convert WMV to MOV Convert WMV to MP4 Convert WMV to WebM Convert WTV to AVI Convert WTV to FLV Convert WTV to MKV Convert WTV to MOV Convert WTV to MP4 Convert WTV to WebM Convert WTV to WMV

Need AI video subtitle translation?

VideoTranslator.org goes beyond free converters: upload a video and its speech is transcribed with AI, translated into subtitles in 30+ languages, and even dubbed with AI voices — all in one browser-based workflow.

Try AI subtitle translation — free