Step 1: Provide your M4A 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 OGG files.
M4A to OGG Conversion FAQ
What bitrate does the OGG file end up at?
+
A lossy OGG is encoded at 192 kbps by default. The Audio Quality setting also offers 320 kbps for the best quality and 128 kbps for a smaller file. A lossless OGG (WAV, FLAC) ignores the bitrate and keeps every sample.
Is converting M4A to OGG a second round of lossy compression?
+
Yes, and it is worth planning around. Both formats are lossy, so the OGG 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 OGG from that instead avoids the double pass entirely. An M4A holds AAC in most cases, or Apple Lossless (ALAC) when it came from a lossless rip. Vorbis inside OGG is lossy and uses variable bitrate by default, so quality is set as a level rather than a fixed kbps figure.
Why will some of my M4A files not convert?
+
DRM. A subset of M4A files are encrypted by the store or the software that issued them, and encrypted audio cannot be decoded by any converter. Anything you ripped yourself, recorded, or bought without protection converts normally; a licensed purchase will not. M4A hides two very different things behind one extension — lossy AAC and lossless ALAC — and non-Apple hardware support is inconsistent.
Will the OGG play in my car or on older hardware?
+
Often not. M4A is decoded by essentially everything, including car head units and elderly players; OGG needs software that knows the codec, which standalone hardware frequently does not have. If the destination is a car stereo or a portable player, that is a strong argument for staying on M4A. OGG has poor hardware support — car stereos, older iPods and many TVs will not see the file at all.
Will going from M4A to OGG actually reduce my audio quality?
+
If M4A is lossy (MP3, AAC) and OGG is lossless (WAV, FLAC), the OGG is no better than the M4A — you cannot recover information already discarded by the lossy M4A codec. If M4A is lossless and OGG is lossy, expect the OGG encoder to recompress; at 192 kbps the loss is imperceptible to most ears.
Can I batch-convert hundreds of M4A files into OGG?
+
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.
Can I normalize loudness in the M4A to OGG step?
+
Not in this step. The converter has no loudness setting and leaves the level as it is. To even out the volume, run the finished OGG through a Normalize tool on this site.
Will the OGG play on my car stereo / iPod / Sonos / Bluetooth speaker?
+
MP3 plays almost everywhere. AAC plays on Apple devices, most Android phones and Sonos. FLAC plays on Sonos and Android but not on older iPods, and WAV plays on nearly everything but makes large files. There are no device presets on this page, so choose the target format your player supports. OGG Vorbis beats MP3 at equal bitrate and carries no licensing cost, which is why game engines and open-source software adopted it wholesale.
Is my M4A file private during conversion?
+
Yes. Uploaded M4A files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted OGG are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
