Create the Best Possible AAC from Your Lossless FLAC Master
Upload your FLAC file and get an AAC that gives the encoder a perfect, uncompressed signal to work from — one clean encoding pass, no double compression, no quality ceiling from a prior lossy codec. The result is an AAC file ready for iPhone, Apple Music, Apple Podcasts, and any streaming platform.
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Audio Format Converter
Upload any audio file, choose an output format, and download the converted result. Supports MP3, WAV, FLAC, AAC, OGG, ALAC, WMA, Opus and M4A.
Drop your audio file here
or click to browse
Sync Your FLAC Library to iPhone as High-Quality AAC
FLAC files are too large for practical iPhone storage and are not accepted by iTunes or Apple Music for library import. Converting to AAC from a lossless FLAC source gives the encoder the full-quality PCM signal — the same quality the original recording contains — producing the best AAC that bitrate can achieve. iTunes imports and syncs the AAC to iPhone with full metadata support.
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Submit FLAC-Mastered Podcasts to Apple Podcasts
Apple Podcasts requires AAC or MP3 for RSS episode delivery. Podcast producers who record and archive in FLAC can convert to AAC for submission. Encoding from a FLAC master ensures the encoder receives a perfect, uncompressed audio signal — producing a cleaner, higher-fidelity AAC episode than converting from a prior lossy intermediate.
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Deliver Streaming-Ready AAC Files from a Lossless Master
Music streaming platforms, royalty-free stores, and content delivery networks often require AAC at specific bitrates. Encoding directly from a FLAC master — rather than from a lossy intermediary like MP3 or OGG — gives the AAC encoder the cleanest possible input, resulting in the best achievable quality for the required output bitrate.
See It in ActionThree steps to the best AAC from a lossless source
Upload your FLAC file
Drop your FLAC file onto the tool or click to browse. Studio masters, CD rips, DAW exports, and archival recordings are all accepted.
Convert to AAC
Click "Convert". FFmpeg decodes the FLAC losslessly to PCM and encodes it as AAC at a high bitrate. The encoder receives a perfect, uncompressed signal — one clean encoding pass from the lossless source.
Download your AAC file
Download your .aac file ready to import into iTunes, submit to Apple Podcasts, upload to a streaming platform, or AirDrop to an iPhone.
Deep Dive
FLAC to AAC: Why Starting Lossless Matters
FLAC is the archive master. AAC is the delivery format for Apple's ecosystem. The quality of an AAC file depends on the quality of the signal the encoder receives. Starting from FLAC means the encoder always works from the best possible source.
Our converter uses FFmpeg to decode FLAC losslessly and encode as AAC at a high bitrate, extracting the best quality the codec can deliver from a perfect source.
Why Convert FLAC to AAC
Best Possible AAC Quality
Encoding from a lossless FLAC source means the AAC encoder receives a perfect, uncompressed signal — no quality ceiling from a prior lossy codec.
Native in Apple Music and iTunes
AAC imports directly into iTunes and Apple Music and syncs to every connected iPhone and iPad with full metadata support.
Apple Podcasts Ready
Apple Podcasts recommends AAC for RSS episode delivery. Convert FLAC podcast masters to AAC before publishing your feed.
Fast Conversion
Most FLAC files convert to AAC in under 30 seconds on dedicated FFmpeg servers.
Who Uses It
Who Converts FLAC to AAC
Audiophiles syncing lossless libraries to iPhone, podcasters submitting FLAC masters to Apple Podcasts, musicians delivering streaming-ready files, and anyone who needs an Apple-compatible AAC from a perfect lossless source.
Converts using FFmpeg on dedicated servers.
Frequently Asked Questions
Why is converting FLAC to AAC better than converting MP3 to AAC?
Converting MP3 to AAC passes already-compressed audio through a second lossy encoder — the quality ceiling is set by the MP3 encoding, and the AAC introduces a second round of degradation on top of it. Converting FLAC to AAC starts from a perfect, uncompressed signal. The AAC encoder receives the full-quality PCM and produces the best achievable result at the target bitrate — a first-generation encode with no prior quality loss.
Why can't I import FLAC directly into iTunes or Apple Music?
iTunes and Apple Music only support Apple's audio formats: AAC (.m4a), MP3, WAV, AIFF, and Apple Lossless (ALAC). FLAC is not on that list. Converting to AAC or ALAC is required for Apple Music import. AAC gives a compressed file for efficient iPhone storage; ALAC gives a lossless file for bit-perfect quality.
What bitrate should I use when converting FLAC to AAC?
For music, 256 kbps AAC is Apple Music's standard streaming quality and is transparent to most listeners. For voice content like podcasts, 128 kbps mono is more than sufficient. For audiophile listening through high-end equipment, 320 kbps AAC is a common choice, though most listeners cannot distinguish it from 256 kbps.
Should I convert FLAC to AAC or ALAC for Apple Music?
ALAC gives you lossless quality — bit-for-bit identical to the FLAC source — but larger files. AAC is smaller and still excellent quality from a lossless source, but it introduces lossy compression. If storage is not a concern and you want every detail from the FLAC master, use ALAC. If you want a compact, efficient file for iPhone storage and everyday listening, AAC at 256 kbps is the practical choice.
Does Apple Podcasts accept AAC from a FLAC source?
Yes. Apple Podcasts accepts AAC delivered in .m4a or .aac containers regardless of the source. Apple Podcasts recommends AAC as the preferred podcast episode format. Converting a FLAC master to AAC before uploading to your RSS host gives Apple Podcasts the cleanest possible source for its own CDN delivery.
Is there a file size limit?
The upload limit is 100 MB per file. Most FLAC audio tracks are well within this limit.
Ready to Convert Your FLAC to AAC?
Upload your lossless master above and get the best possible AAC in seconds.