Step 1: Share your M4R files using the button above or by drag and drop.
Step 2: Click the 'Transform' button to start the transformation.
Step 3: Grab your converted MKV files.
M4R to MKV Transformation FAQ
How do I convert an M4R file to MKV?
+
Upload your M4R file using the picker above and the converter detects the source type and runs the M4R → MKV pipeline. The result downloads automatically when conversion completes; no account needed for one-off conversions. M4R is an iPhone ringtone — an ordinary AAC file in an MP4 container with the extension changed so iTunes files it as a tone. MKV is Matroska, an open container designed in 2002 with no licensing restrictions and no ceiling on what it can hold.
What will the picture be if I put M4R audio into an MKV file?
+
You choose it, because audio alone has no picture. The default is a static waveform render, and you can supply a still image instead — cover art, a title card, a photo — which is held for the whole duration. That is what makes the file uploadable to video-only platforms that will not accept a bare audio track. MKV is the archival container of choice because it stores unlimited audio tracks, soft subtitles, chapter markers and cover art in one file.
Is the M4R audio re-encoded when it goes into the MKV?
+
Only if it has to be. Where the MKV container accepts the source audio codec directly, the stream is copied in untouched and stays bit-identical. Where it does not, the audio is transcoded once to whatever MKV does accept, at a bitrate matched to the source so the second pass costs as little as possible. The payload is AAC, conventionally capped at 40 seconds, which is the longest tone iOS will accept. MKV is codec-agnostic: H.264, HEVC, VP9 and AV1 video sit happily beside AAC, FLAC, Opus, DTS or Dolby audio in the same file.
How large will the MKV be compared with the M4R?
+
Barely larger, if you use the default still image. A single held frame compresses to almost nothing across the whole duration because every frame is identical to the last, so the file is dominated by the audio track. Choosing an animated waveform instead adds real video data and can double or triple the result.
Do the artist and album tags on my M4R survive into the MKV?
+
Partially. Title and artist map onto the video container’s own metadata fields, and embedded cover art is a natural fit for the still image the video displays. Everything else — track number, album, year, genre — has no equivalent slot in a video file and is dropped rather than approximated.
Is the M4R to MKV converter free?
+
Yes — basic M4R → MKV conversion is free with no registration required. Premium adds higher per-file size limits, more parallel batch workers, longer retention, and removes ads.
How big an M4R file can I convert to MKV?
+
Free accounts: up to 100 MB per M4R file. Premium: typically 1 GB per file depending on the source type. Very large files are split into chunks server-side when the MKV format allows.
Will conversion change the content of my M4R?
+
Conversion preserves all information that both M4R and MKV can represent. Format-specific features the MKV cannot represent (e.g. vector data in raster output, formulas in plain-text output) are rasterized or stripped — the result page lists what changed.
Can I convert many M4R files to MKV at once?
+
Yes — drop multiple M4R files into the upload zone and they are queued in parallel. Premium runs more parallel workers; on a 50-file batch this is the difference between minutes and seconds.
Does the M4R to MKV converter work on phones and tablets?
+
Yes — the UI is responsive and the conversion pipeline runs server-side, so mobile devices upload-then-download just like desktops. iOS and Android browser file pickers (camera roll, Files app) work end-to-end.
Which browsers does the converter support?
+
Chrome, Firefox, Safari (15+), Edge, and Opera. The converter uses standard `<input type="file">` upload — no WebAssembly or PWA dependency — so even older browsers work to upload an M4R and download the MKV.
Are my M4R files kept private?
+
Yes — uploaded M4R files are processed in isolated workers and deleted within minutes. We never view, retain, or share content. The retention window is at /privacy/. M4R drops straight into the iOS Sounds list via Finder or iTunes with no further processing.
