Step 1: Supply your M4R 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 MP3 files.
M4R to MP3 Conversion FAQ
What does the M4R to MP3 converter do?
+
It converts a M4R file into MP3 format.
Will the data inside my M4R be preserved when converting to MP3?
+
Yes — the content is mapped to the MP3 equivalent. Format-specific extras that MP3 does not represent natively are omitted rather than corrupted.
Is the M4R to MP3 conversion reversible?
+
You can convert the MP3 back to M4R 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 M4R to MP3?
+
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 M4R to MP3 a second round of lossy compression?
+
Yes, and it is worth planning around. Both formats are lossy, so the MP3 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 MP3 from that instead avoids the double pass entirely. The payload is AAC, conventionally capped at 40 seconds, which is the longest tone iOS will accept. MP3 is lossy: a psychoacoustic model discards frequencies the ear is unlikely to notice, typically at 128 to 320 kbps.
What exactly is an MP3 file?
+
A bare run of encoded audio frames with no container wrapped around them. That is why two MP3 files can usually be joined by simply putting one after the other, and equally why everything beyond the audio itself — a length, a seek index, cover art — has to be bolted on as a convention rather than being part of the format, so a player often has to read the whole file to work out how long it is. It is about the simplest thing that can be called an audio file, which is exactly why it turns up inside other containers more often than on its own.
Is there a licence attached to M4R?
+
Not one you have to think about. The codec is covered by patent pools, and the licensing is settled by whoever ships the decoder — the phone, the browser, the operating system — long before a file reaches you. It is why the format is everywhere in hardware, and why royalty-free alternatives were built at all. It changes nothing about converting a file you already have, and it is only a live question if you are shipping an encoder yourself.
Who defines MP3?
+
A standards body rather than a company, which is most of the reason it is everywhere. MP3 was specified through the international process that produces the MPEG standards, so broadcasters, phone manufacturers, browser vendors and streaming services all implemented the same document instead of licensing somebody's product. The practical consequence is boring and useful: an MP3 made by one tool decodes identically in another, and there is no vendor whose support could be withdrawn. MP3 is MPEG-1 Audio Layer III, finalised in 1993, and still the most universally decodable audio format that exists.
Is there a file-size limit when converting M4R to MP3?
+
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 M4R files to MP3 at once?
+
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 M4R files after the conversion?
+
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.
What apps can play a MP3 file?
+
MP3 plays in most music players, browsers, and media libraries. iTunes / Apple Music, VLC, Foobar2000, and phone media apps handle it natively.
