M4V → MKV
Convert M4V video to MKV entirely in your browser — no upload, no watermark, no sign-up.
Drop files here
or browse from your device
images · audio · video · documents · archives · up to ~500MB
Your first conversion lands here automatically — saved on this device only, never uploaded.
100% Private
Runs in your browser. No upload.
Instant
No queue, no server roundtrip.
Offline-ready
Works after first load.
Re-wrapping M4V footage as MKV is what makes it playable and editable outside the device or era it came from, without re-shooting anything. MKV (Matroska Video) earns its place here: unlimited tracks, subtitles and chapters in one open, patent-free container. M4V is Apple's MP4 variant used by iTunes and the Apple TV ecosystem. Technically it is MP4; the different extension mostly signals Apple tooling and optional FairPlay protection.
M4V is Apple's MP4 variant used by iTunes and the Apple TV ecosystem. Technically it is MP4; the different extension mostly signals Apple tooling and optional FairPlay protection.
Picture and sound are re-encoded into the MKV container at a bitrate chosen to keep the result visually close to the M4V source. Resolution, frame rate and duration are preserved; file size usually changes noticeably because M4V and MKV lean on different codecs. Multiple audio tracks or chapter data may not carry over.
What you gain with MKV: Unlimited tracks, subtitles and chapters in one open, patent-free container.
Drop your M4V file above and Morphio decodes it locally, then re-encodes it as MKV using WebAssembly + the browser's native codecs. Nothing is ever uploaded — your files stay on your device. Batch as many files as your machine can handle. See exactly how in-browser conversion works.
Open the M4V to MKV page, drop your video on the drop zone and press convert. Morphio runs an FFmpeg build compiled to WebAssembly that runs inside the page, so the M4V data never leaves your device and no server ever receives a copy.
Audio and video tracks are re-encoded together, so the result stays in sync and plays on standard players. Converting M4V to MKV only rewrites the container and encoding you asked for — the source file on your disk is never modified.
Yes. The free plan covers 10 conversions a day with files up to 200 MB and adds no watermark or sign-up. Morphio Pro ($5/month, or $29 once for lifetime access) removes the daily cap and raises the per-file limit to 5 GB.
Morphio decodes the M4V file at full fidelity and re-encodes it at a high-quality MKV setting, so the difference is normally invisible or inaudible. What conversion cannot do is recover detail the original M4V file already threw away.
Yes — drop the whole batch in and each file is processed in turn on your own machine. The practical limit is your device's memory and patience, not a server quota, because nothing is queued anywhere else.
No. The conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can disconnect from the internet after the page loads and it still works.