Step 1: Supply your MP4 files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted M4R files.
MP4 to M4R Conversion FAQ
What does the MP4 to M4R converter do?
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It converts a MP4 file into M4R format.
Will the data inside my MP4 be preserved when converting to M4R?
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Yes — the content is mapped to the M4R equivalent. Format-specific extras that M4R does not represent natively are omitted rather than corrupted.
Is the MP4 to M4R conversion reversible?
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You can convert the M4R back to MP4 on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
What output quality should I expect from MP4 to M4R?
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Default settings target broadcast / web quality — visually identical to the source for most viewers. For archival use, pick the highest quality option in the converter settings.
Is converting MP4 to M4R a second round of lossy compression?
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Yes, and it is worth planning around. Both formats are lossy, so the M4R encoder is working from audio that has already been through one psychoacoustic pass, and its own decisions compound the first set. At 192 kbps or above the result is still transparent for most listening. If you have a lossless master anywhere, encoding the M4R from that instead avoids the double pass entirely. Almost every MP4 in the wild is H.264 video with AAC audio; the container also legally holds HEVC, AV1 and VP9. The payload is AAC, conventionally capped at 40 seconds, which is the longest tone iOS will accept.
Can I tag the M4R with artist and album information?
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Yes, and it is a genuine gain over MP4, which has nowhere dependable to store any of it. M4R carries title, artist, album, year, track number and embedded cover art in the container itself, so a music library files it correctly without a manual pass. M4R drops straight into the iOS Sounds list via Finder or iTunes with no further processing.
Is there a file-size limit when converting MP4 to M4R?
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Free conversions have a size limit per file, set by the type of file, and the page tells you when a file is over it. A paid plan removes that limit, so much larger files can be converted.
Can I batch-convert several MP4 files to M4R at once?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
What happens to my MP4 files after the conversion?
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Uploaded files are processed on our own conversion servers, nobody looks at them, and they are not shared. The upload and the converted file are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
Where can I open my M4R file?
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M4R opens in the standard tools for its category. Browsers and built-in OS viewers handle the common cases.
Do I need to install software to convert MP4 to M4R?
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No. The converter runs entirely in your browser plus our cloud — no plugin, no install, no admin rights. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.
Do I need an account to convert MP4 to M4R?
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Yes. One conversion an hour is free, with no account needed, for a file within the free size limit. A paid plan removes the hourly limit and the size limit, and lets you add several files to one job.
