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MP4 vs WEBM vs MKV, settled simply
Three containers, three jobs. MP4 plays everywhere, WEBM keeps websites light, MKV archives everything. Here is when each one wins — and how to move between them without losing quality.
Open the Video Converter — free →Advertisement
Step by step
- Identify the destination: phone/TV/app → MP4; web page → WEBM; long-term archive with subtitles and multiple audio tracks → MKV.
- Upload your video to the Video Converter.
- Choose the target format and convert — the video stream is handled at high-quality settings by default.
- Check the result plays where it needs to before deleting your original.
Tips from people who do this a lot
- Sending a video to a person? MP4. Embedding it on a page? WEBM. Keeping it forever? MKV plus the original.
- A file that will not play is usually a codec problem wearing a container costume — re-encoding to MP4 fixes it either way.
- GIF is not on this list on purpose: for anything longer than a few seconds, MP4 is smaller and smoother.
FAQ
Can I convert MKV to MP4 without losing quality?
Yes — the conversion re-wraps/re-encodes at high-quality defaults, and for typical viewing the result is indistinguishable.
Why do downloads from some sites arrive as WEBM?
Because it is smaller to serve. Convert to MP4 if your player refuses it.
Is this really free?
Yes — every tool on this site is free. A short ad before your download is what pays the server bills, so nothing needs a paywall or an account.