Step 1: Provide your MP4 files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted M4R files.
MP4 to M4R Conversion FAQ
How do I extract just the audio track from MP4 as M4R?
+
Upload the MP4 file and the converter demuxes the audio stream from the MP4 container, then transcodes it into M4R. Video frames are discarded — no second video pass, no quality loss beyond what the M4R codec itself introduces. MP4 is ISO/IEC 14496-14, standardised in 2001 and derived from the same QuickTime box layout MOV uses. M4R is an iPhone ringtone — an ordinary AAC file in an MP4 container with the extension changed so iTunes files it as a tone.
Is converting MP4 to M4R a second round of lossy compression?
+
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?
+
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.
What happens to multichannel audio when converting MP4 to M4R?
+
It is folded down to stereo, because M4R has no practical multichannel mode. The downmix uses the standard coefficients so centre-channel dialogue stays clear and the surrounds are mixed in at reduced level. Anything that depended on discrete channel placement is gone once that happens. M4R is Apple-only and length-limited; anything over 40 seconds is silently rejected by the phone.
Which audio track gets extracted when my MP4 has several?
+
By default stream 0 (the first audio track, usually the main mix). If your MP4 carries commentary, dubs, or descriptive audio on additional tracks, the advanced "audio stream" picker lets you pick 1, 2, 3... explicitly. The track list is shown in the upload preview so you do not pick blind.
What bitrate does the M4R file use?
+
Default M4R bitrate is 192 kbps (transparent for music to most ears). Override to 320 kbps for audiophile output, or 96-128 kbps for voice / podcast where the smaller file is the priority. Lossless M4R targets (WAV, FLAC) ignore the bitrate setting and keep every sample.
Will going from MP4 to M4R reduce my audio quality?
+
If the M4R format is lossless (WAV, FLAC, ALAC), every original sample is preserved. If M4R is lossy (MP3, AAC, OGG, Opus), the codec recompresses — at 192 kbps the difference is inaudible for most content; at 96 kbps you may hear cymbals or sibilants softening. The MP4 container has no influence on this — only the codec settings matter.
Does the extracted M4R keep the MP4 sample rate?
+
By default yes — 48 kHz MP4 audio becomes 48 kHz M4R audio, 44.1 kHz becomes 44.1 kHz. If you need to downsample for compatibility (e.g. 96 kHz studio masters to 44.1 kHz CD-quality M4R) the sample-rate dropdown does this with high-quality resampling.
Can I batch-extract M4R audio from a folder of MP4 files?
+
Yes — drop a folder of MP4 files into the upload zone and we run extraction in parallel. Premium gets more parallel workers; on a 100-file batch (typical music-video collection) this is the difference between 90 seconds and 8 minutes.
How long does extracting M4R from a 1-hour MP4 take?
+
Audio demux + transcode runs much faster than video re-encoding — typically 5-15% of source duration. A 1-hour MP4 -> M4R finishes in 3-9 minutes on the standard pipeline. If the M4R codec matches the source codec already in the MP4 (common for AAC inside MKV / MP4), it is a pure remux and runs in seconds.
Will the M4R file carry title / artist / album tags?
+
If the MP4 file stores stream metadata (artist, title, album), we copy those fields into the M4R container where the format supports tags. ID3v2 (MP3), Vorbis comments (OGG, FLAC), MP4 atoms (AAC / M4A), RIFF INFO (WAV) are all written. Untagged MP4 produces untagged M4R — use Mp3tag or Picard post-export to enrich.
Is my MP4 private during audio extraction?
+
Yes — same privacy model as every conversion. Source MP4 and output M4R are processed in isolated workers and deleted within minutes. We never play, store, or share content. See /privacy/.
