tinyvid.dev

Convert MKV to MP4

MKV holds great video but won't play in Safari or on most phones. Convert it to a web-ready MP4 that works in every browser and pastes in as embed code — free up to 200 MB, no sign-up.

tinyvid · converter

Drop your video here

or browse files
MP4 · MOV · AVI · MKV · WebM · GIF|Free up to 200 MB
01About the conversion

Why convert MKV to MP4?

MKV (Matroska) is a flexible open-source container popular for high-quality video, multiple audio tracks and subtitles — common for archived films, anime and screen captures. It usually wraps efficient codecs like H.264, HEVC or VP9, which is great for storage but awkward for the open web.

The problem is browser support: Chrome and Edge play some MKVs, but Safari and most mobile browsers don't recognise the container at all, so your video tag fails for a big slice of visitors. MKV also isn't designed for progressive HTTP streaming the way MP4 is.

Converting MKV to MP4 moves the video into the MP4 container with H.264 (or AV1) and AAC audio — the combination that plays on iPhone, Android and every desktop browser. TinyVid keeps the picture crisp, compresses for the web, and generates embed code you can paste anywhere. Note that extra subtitle and audio tracks are flattened to a single web-friendly stream.

02Step by step

How to convert MKV to MP4

  1. Drop your .mkv onto the box above or browse — files up to 200 MB are free, no account needed.
  2. Select a preset — Standard player keeps quality balanced; Max compression targets the smallest file.
  3. Optional: use Advanced settings to force H.264 for maximum compatibility or cap the resolution.
  4. Press Convert and TinyVid re-encodes the Matroska stream into MP4.
  5. Copy the video tag, background-loop, or lazy-load embed and add it to your page.
03FAQ
01How do I convert MKV to MP4 for free?
Upload the .mkv above, choose a preset and press Convert — up to 200 MB is free with no sign-up, and up to 4 GB is a one-time payment by size.
02Why won't my MKV play in Safari or on my phone?
Safari and most mobile browsers don't support the Matroska (MKV) container. Converting to MP4 with H.264 gives you a file that plays in every browser and on iPhone and Android.
03Are subtitles and multiple audio tracks kept?
MP4 for the web uses a single video and audio track, so extra streams and soft subtitles inside the MKV aren't carried over. Subtitles burned into the picture remain visible.
04Does MKV to MP4 reduce quality?
Re-encoding is lossy, but TinyVid tunes for web delivery — a smaller MP4 at visually similar quality. Raise the Quality slider in Advanced settings to preserve more detail.
05Is MP4 or MKV better for embedding on a website?
MP4 — it's universally supported and streams progressively over HTTP. MKV is better for archiving, but it's the wrong choice for a video tag.
06Do I need software to convert MKV?
No. It runs online — no player, no codec pack, and no login for free or one-time conversions.