🔥 BurnSub
🔥 MKV (with or without embedded subs) → MP4 · browser-local · no upload

Burn subtitles into MKV — and export to MP4 in your browser

Container conversion MKV → MP4 · WebCodecs H.264 · subtitle track extraction supported · 100% browser-local

MKV files often ship with multiple subtitle tracks already embedded — perfect for archival but a problem for social-media upload, since most platforms strip or ignore MKV subtitle tracks. BurnSub extracts subtitles from your MKV (or accepts an external SRT/VTT) and hardcodes them into a new MP4 file, ready for TikTok, Reels, YouTube, or any modern player.

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How to burn subtitles into mkv

  1. 1

    Drop your MKV file

    Open burnsub.com and drop the MKV. BurnSub parses the container and lists all available subtitle tracks.

  2. 2

    Pick the subtitle track

    Choose which embedded track to burn (e.g., English forced, Japanese full, Spanish), or import an external SRT/VTT file.

  3. 3

    Style the captions

    Apply a preset (anime-katakana-vibe, cinema-letterbox, gaming-neon, etc.) or customize manually.

  4. 4

    Burn and convert to MP4

    BurnSub renders captions into the frames and packages everything into a new MP4 — playable everywhere.

  5. 5

    Download the MP4

    Save the result locally. Original MKV is untouched. No upload happened.

Frequently asked

Why convert MKV to MP4 with burned subtitles?

MKV is great for desktop playback but most social platforms reject it or strip the subtitle tracks. Burning subtitles into an MP4 makes the captions visible everywhere, no MKV support needed.

Can BurnSub read embedded subtitle tracks from MKV?

Yes — text-based subtitle tracks (SubRip, ASS, SSA) are parsed and made selectable. Image-based tracks (PGS, VobSub) are not directly supported; export them as SRT first using a tool like SubtitleEdit.

Does it support multiple audio tracks?

BurnSub keeps the first audio track by default. Multi-audio export is on the roadmap.

Will my MKV with HEVC/H.265 work?

Yes for browsers that support HEVC decoding (Safari, recent Edge/Chrome with hardware support). Output is H.264 MP4 for maximum compatibility.

Is the MKV uploaded to your server?

No. Everything is local-browser. BurnSub has no servers that touch your media.

Ready to burn mkv (with or without embedded subs) into mp4?

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🔥 Start Burning