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home/audio/flac-to-m4a

Convert FLAC to M4A Online Free

Your FLAC collection, on your iPhone. Lossless or small, your call.

Apple's Music app doesn't import FLAC. It does take M4A, which can hold either Apple Lossless (identical to your FLAC) or AAC (much smaller, near-identical to most ears). Tell us your library size and how much space you have.

albums250 · 72.5 GB FLAC
free space on the phone
16 GB32 GB64 GB128 GB
your FLAC files are
CD quality16-bit / 44.1 kHzHi-res24-bit / 96 kHz
Lossless won’t fit. AAC 256 kbps is the best quality that leaves at least 15% of the phone free.
Apple Lossless (ALAC)identicalBit-for-bit the same as your FLAC. About the same size, a few percent larger.75.0 GBtoo big
AAC 256 kbpsApple Music qualityWhat Apple sells. Indistinguishable from lossless for nearly everyone.23.8 GB37% of phone
AAC 192 kbpsbalancedTransparent for most music on most headphones. A third less space again.18.0 GB28% of phone
AAC 128 kbpssmallestFine for podcasts and casual listening; cymbals and applause can sound slightly smeared.12.0 GB19% of phone
library_musicConvert library to AAC 256 kbps

Open songs, voice memos or old archives and save them as MP3, AAC, FLAC, Opus, WMA, AC3, AMR or any of 19 more. Pick a quality preset or an exact bitrate, convert the whole batch in one pass, then download each file or one ZIP.

music_noteTry a sample track
lockFiles stay on your devicelibrary_music26 output formatsstacksBatch convert, one ZIPtunePresets or an exact bitrate
Your filesempty
upload_fileDrop audio files hereMP3, WAV, FLAC, M4A, OGG, OPUS, WMA, AIFF, AMR, AC3 and more. Add as many as you like; they convert one after another.
swap_horizConvert the sample to .mp3folder_zip
The FFmpeg engine (about 31 MB) downloads on your first conversion and runs on this device.
1Save as26 formats
.mp3.m4a.wav.flac.opus
searchAll 26 formatsexpand_more
search
. ·
.mp3MP3
MPEG-1 Audio Layer III, the universal standard. Best for music, podcasts and sharing.
Containermp3Encoderlibmp3lameMIME typeaudio/mpegFirst bytes49 44 33 or FF FBHerechecked when the engine loads
2Qualitylossy · smaller
Low96 kbps · 44.1 kHz · mono
Medium128 kbps · 44.1 kHz · stereo
High192 kbps · 48 kHz · stereo
Ultra320 kbps · 48 kHz · stereo
Customset it yourself
Bitrate
Bit depth
Sample rate
Channels
infoEach preset sets bitrate, sample rate and channels together. MP3 at 192 kbps is the usual choice for music.
3What you’ll getexample
a 3-minute stereo track3:00≈ 4.32 MB
The exact command each file goes throughffmpeg -i input.wav -vn -map_metadata 0 -ar 48000 -ac 2 -c:a libmp3lame -b:a 192k -f mp3 output.mp3
swap_horizConvert the sample to .mp3
~/can-you-hear-it

At 256 kbps, AAC fools almost everyone.

In blind listening tests, most people can't reliably pick high-bitrate AAC from lossless. What changes is what you listen through. Pick your headphones to see the bitrate beyond which extra quality stops being audible.

earbudsAirPods / earbudsheadphonesGood wired headphonesdirections_carCar stereospeakerStudio monitors
96128160192224256320
bars: share of listeners who can tell it from losslesstransparent from 160 kbpsBluetooth re-compresses everything to AAC around 256 kbps on the way to your ears, so anything above that is literally thrown away before you hear it.
~/one-way-street

Keep the FLAC originals. Always.

ALAC can be turned back into an identical FLAC. AAC can't; the detail it discarded is gone. Treat the FLACs as your master copy and the M4As as a portable edition.

FLACarrow_forwardALACarrow_forwardFLACarrow_forward
FLAC → ALAC → FLACBoth are lossless, so converting back gives a FLAC whose audio is identical to the original, sample for sample.check_circlereversible
FLACarrow_forwardAACarrow_forwardFLACarrow_forward
FLAC → AAC → FLACConverting the AAC back to FLAC produces a big lossless file of lossy audio. The discarded detail doesn’t return.cancelnot reversible
FLACarrow_forwardAACarrow_forwardMP3arrow_forward
FLAC → AAC → MP3Each lossy step removes something different, so damage adds up. Always convert from the FLAC master, never between lossy formats.warningavoid

Frequently Asked Questions

Is converting FLAC to M4A free?

Yes, FLAC to M4A conversion is completely free with no signup, no watermark, and no usage limit. Convert as many files as you need.

Are my files uploaded to a server?

No. The FLAC to M4A converter runs in your browser when your file is supported there, so the file stays on your device for that workflow, reducing server exposure for that workflow. Check which processing mode is in use before you upload anything sensitive.

How long does FLAC to M4A conversion take?

Most FLAC to M4A conversions finish in under a minute. Larger files take proportionally longer, but everything happens locally so there is no sign-up wait.

Will the conversion reduce file quality?

That comes down to the formats at each end. A lossless conversion changes nothing you can measure. A lossy one shaves the file down and takes a small amount of quality with it.

Does this work on mobile devices?

Yes. The FLAC to M4A converter works on phones, tablets, and desktops in any modern browser including Chrome, Safari, Firefox, and Edge.