MKV to MP4

Turn complex MKV containers into clean, broadly compatible MP4 files without guessing at codecs or tracks. OneFreePlace inspects video, audio and subtitle streams, preserves compatible media when safe, and only re-encodes what actually needs changing.

Private by designYour MKV stays on this device during browser conversion. No signup, no watermark and no upload queue.

MKV → MP4 workspace

Track-aware · H.264 · AAC · MP4 captions · Fast start

Local processingFFmpeg/WebAssembly runs on your device. OneFreePlace serves the engine files when needed.

MKV

Drop an MKV here

H.264, HEVC, VP9, AV1 and common MKV audio/subtitle combinations can be inspected by the real media engine before conversion.

Your video is not uploaded to OneFreePlace.

MKVWe will decode a local preview and timeline after inspection.

MKV source

——

Large-file notice

Size—

Duration—

Video—

Audio—

Source analysisWaiting…Exact video, audio, subtitle, dimensions and frame-rate information are checked locally.

Recommended pathWaiting…Smart Auto avoids unnecessary recompression and makes subtitle handling explicit.

Visual trimInspect the file first

StartEnd

Click a frame to inspect itKeyboard: I = in · O = outExact values supported

MP4 ready

Your converted video is ready.

Download MP4

Output—

Video—

Audio—

Duration—

Captions—

✓ Output verification pending

Conversion strategy

Keeps H.264/AAC untouched when safe, converts incompatible audio, and handles subtitle tracks explicitly instead of silently losing them.

Quality

Video

ResolutionFrame rate

Audio

Audio track

Audio output

Normalize volumeEven out unusually quiet or loud source audio.

MKV audio tracks will appear here after inspection.

Compatibility & captions

DeinterlaceRotate

Flip

Subtitle trackSubtitle handling

Text subtitle tracks can be converted to MP4 captions or burned into the picture.

Smart Auto makes track decisions explicit. MP4 receives one chosen audio track and, when requested, one chosen caption track rather than silently taking the first streams.

Smart AutoInspect a file to see the exact conversion route.

Engine loads after you choose a file

Choose an MKV to begin.

Browser processing is free and private. WebAssembly has a 2 GB input ceiling; large or complex MKV files may exceed your device memory. WordPress does not process your video.