How do I convert M4A to FLAC?

Add your M4A file to the upload area above, then press Convert. The FLAC file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to FLAC reduce quality?

No. FLAC is a lossless format, so the conversion preserves exactly what is in your M4A file. Note that it cannot recover detail that was already discarded when the M4A was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 300 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

AudioLosslessRuns in your browser

M4A to FLAC Converter

Turn M4A files into FLAC in a couple of clicks. MP4 container holding AAC or ALAC audio. Lossless compression — CD quality at roughly half the size. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

M4A files (.m4a, .m4b) · up to 300 MB each

or paste files from your clipboard

Ready when you are

Drop a M4A file above and FileTools360 will turn it into FLAC — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your M4A files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control bitrate, sample rate and channels and start and end times.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

M4A and FLAC explained

M4A is an MP4 container holding only audio — usually AAC, sometimes Apple Lossless. The extension exists mainly so players know not to look for a video track.

FLAC compresses audio losslessly, typically to about half the size of WAV. Decompressed, it is bit-for-bit identical to the original — the compression is mathematical, not perceptual.

Where M4A files come from: iTunes purchases, Apple Music downloads, voice memos and audiobooks.
Where FLAC is used: Hi-fi music libraries and archival rips of physical media.

M4A vs FLAC

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

M4A compared with FLAC
Property	Source	Target
Compression	Lossy or lossless	Lossless
Introduced	2001	2001
Browser support	Very good, especially on Apple platforms.	Great on desktop and Android; iOS support is newer.

M4A is stronger at: Excellent quality per byte. Proper chapter support, which is why audiobooks use it. Strong metadata and artwork handling.
FLAC is stronger at: Lossless — provably identical to the source. Roughly half the size of WAV. Rich metadata and cover art support.

Why convert M4A to FLAC?

People make this switch when they run into the limits of M4A: you need certainty that any device will play it. FLAC is the better fit when archiving music you may want to re-encode later, or storing CD rips.

M4A limitations that prompt the switch: Less universal than MP3 on older or cheaper hardware. The extension hides what codec is actually inside.
What you give up: Much larger than MP3 or AAC. Not supported natively by all portable devices.

Does converting M4A to FLAC reduce quality?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.