Upload your M4R file and PDF.to re-encodes it into a OGG container with sensible default bitrate and sample-rate. The OGG download is ready in seconds.
Is M4R to OGG a lossy or lossless conversion?
+
If both M4R and OGG are lossless (WAV, FLAC, AIFF), no quality is lost. If OGG is lossy (MP3, AAC, OGG, Opus), audio is re-encoded; we default to a high bitrate (192-320 kbps) for near-transparent quality.
What bitrate does the OGG output use?
+
192 kbps by default for OGG where applicable. Use the options panel to pick 96, 128, 192, 256, or 320 kbps depending on whether you want smaller files or higher fidelity.
Are tags (artist, title, album) preserved when converting M4R to OGG?
+
Yes. ID3 / Vorbis / iTunes-style tags are mapped across formats. Album artwork is preserved when OGG supports it.
Will sample-rate and bit-depth survive the M4R to OGG conversion?
+
Yes by default. We do not downsample or dither unless you ask for it in the options panel. For voice you can opt into 22 kHz mono to shrink file size.
Can I convert a stereo M4R to mono OGG?
+
Yes — toggle the 'force mono' option. This is useful for podcasts and voice memos to roughly halve file size.
Does PDF.to support multi-channel (5.1, 7.1) M4R files?
+
Yes for OGG formats that support multi-channel (AC3, FLAC, Opus). For stereo-only targets, multi-channel audio is downmixed using a perceptually weighted mix.
Can I batch-convert M4R files to OGG?
+
Yes. Drop a whole folder of M4R files; each becomes a separate OGG and all are zipped for download.
Is the M4R to OGG converter free?
+
Yes for files under 100 MB. PRO unlocks larger files (5 GB), parallel jobs, and higher bitrates.
Does the converter remove DRM from M4R files?
+
No. PDF.to does not attempt to remove DRM. Conversions only succeed on unprotected source files.
Will the OGG I download play on iPhone, Android, and desktop?
+
Yes. OGG is supported natively across all major platforms or via universally available codecs. We default to the most-compatible OGG profile.
Are my M4R files private during conversion?
+
Yes. Uploads are encrypted in transit, the conversion runs in an isolated worker, and both the M4R and OGG files are deleted within an hour.