Will converting lossy M4A to FLAC improve the audio quality?

No. If the original M4A uses lossy AAC encoding, converting to FLAC preserves that quality in a lossless wrapper but cannot recover discarded audio data. However, if your M4A uses Apple Lossless (ALAC), the conversion to FLAC is truly lossless.

How much larger will the FLAC file be compared to M4A?

If the M4A is lossy AAC, the FLAC will be significantly larger (roughly 3-5x) since FLAC stores uncompressed-equivalent data. If the M4A is ALAC, the FLAC file will be a similar size.

Can I play FLAC files on my iPhone?

Yes. iOS 11 and later natively support FLAC playback, and most third-party iOS music players like VLC and Foobar2000 also handle FLAC files.

Is FLAC better than M4A for archiving music?

FLAC is open-source and has broader support outside the Apple ecosystem. For long-term archiving, FLAC is preferred because it is not tied to any single company's format decisions.

Will the metadata and album art transfer to FLAC?

Yes. FLAC supports Vorbis comments for metadata and can embed cover art, so your song info and artwork are preserved during conversion.

M4A to FLAC Converter

FLAC is the leading open-source lossless audio codec favored by audiophiles and music archivists. Converting M4A to FLAC moves your audio out of Apple's ecosystem into a universally supported lossless format that works with high-end audio players, Plex media servers, and Linux-based music systems.

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Convert FLAC to M4A instead

If your M4A contains ALAC (Apple Lossless), the conversion to FLAC is mathematically lossless — the audio is bit-for-bit identical. If the M4A uses lossy AAC, the FLAC output faithfully captures the decoded audio without adding further degradation.

How to Convert M4A to FLAC

1
Upload your M4A file by dragging it into the converter area.
2
Select FLAC as the output format.
3
Click Convert and download your FLAC file when the conversion is complete.

M4A vs FLAC — Format Comparison

Feature	M4A	FLAC
Full Name	MPEG-4 Audio	Free Lossless Audio Codec
Type	Audio	Audio
Codec	AAC / ALAC	FLAC
Lossless	No	Yes
Extension	.m4a	.flac
Best For	Apple Music and iTunes library	Audiophile music collections

M4A Strengths

Superior audio quality to MP3 at same file size
Native support on all Apple devices and iTunes
Supports both lossy (AAC) and lossless (ALAC) audio

FLAC Strengths

100% lossless — bit-for-bit identical to original
Open source and royalty-free
50-60% smaller than uncompressed WAV

Frequently Asked Questions

When to Convert M4A to FLAC

Migrating an Apple Music library to an open-source lossless format
Preparing audio for audiophile players and DACs that prefer FLAC
Archiving music collections in a vendor-neutral lossless codec
Serving high-quality audio through Plex, Jellyfin, or Navidrome servers

Related Conversions

M4AMP3 M4AWAV M4AAAC M4AOGG MP3FLAC WAVFLAC AACFLAC OGGFLAC

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About Our M4A to FLAC Converter

This converter uses FFmpeg compiled to WebAssembly (WASM) to transform your M4A files into FLAC format entirely inside your web browser. When you select a file for conversion, the processing happens locally on your device. Your file is never uploaded to any server, never transmitted over the internet, and never stored anywhere outside your own computer. This privacy-first architecture makes our tool safe for confidential and sensitive content — including legal recordings, medical files, financial presentations, personal media, and any other material you would not want on a third-party server.

The conversion process works by decoding the M4A input using FFmpeg's highly optimized decoders, then encoding the output in FLAC format with carefully tuned settings that balance quality and file size. When possible, the tool uses stream copy mode to remux (rewrap) compatible streams without re-encoding, which preserves the original quality with zero generational loss. When re-encoding is necessary due to codec differences between the two formats, the converter uses high-quality encoding settings to minimize any visible or audible quality reduction.

Supported input formats include MP3, WAV, AAC, FLAC, and OGG for audio, with automatic detection of the codecs and parameters inside your source file. The output is optimized for maximum compatibility with modern devices and platforms including Windows, macOS, Linux, iOS, Android, smart TVs, and all major web browsers.

Why browser-based conversion is safer: traditional online converters require you to upload your file to a remote server, where it is processed by third-party infrastructure and then made available for download. This workflow exposes your data to interception during upload, unauthorized access on the server, unclear data retention policies, and potential data breaches. Professionals in regulated industries such as healthcare (HIPAA), legal (attorney-client privilege), and finance (SOX, GDPR) often cannot use server-based converters without violating compliance requirements. Our WebAssembly-powered approach eliminates all of these risks by ensuring your data never leaves the browser sandbox on your own device.

The tool handles files up to 500 MB on desktop browsers and 200 MB on mobile devices. No account registration, no software installation, and no recurring subscription is required. Conversion typically completes in seconds for small files and a few minutes for larger ones, depending on your device's processing capabilities. Once the conversion is finished, you can download the result immediately and the source data is discarded from browser memory.