Filenary

M4A to FLAC Converter

Convert M4A audio files to FLAC audio right in your browser — free, private and with no size limit.

Drop your file here

or click to browse

Choose File

On first use, a ~30 MB conversion engine is downloaded to your browser (one time only).

This file is processed in your browser and never uploaded to a server.

How to convert M4A to FLAC

  1. 1Drop your M4A file into the box above, or click to choose it from your device.
  2. 2Click Convert. The conversion runs locally in your browser — nothing is uploaded.
  3. 3Download your new FLAC file as soon as it's ready.

Why convert M4A to FLAC?

M4A isn't supported by some older devices, editors and websites that expect MP3. FLAC keeps perfect CD-quality sound at around half the size of WAV.

The size math: M4A vs FLAC

At typical quality a minute of content weighs about 1.9 MB as M4A and 5.5 MB as FLAC — after conversion your FLAC file comes out about 2.9× larger.

What is M4A?

M4A is an audio file in an MPEG-4 container, usually AAC. It's the default audio format on iPhone and in iTunes.

  • MIME type: audio/mp4
  • Introduced: 2003 with the iTunes Store
  • An MP4 container holding AAC (rarely ALAC) audio
  • Same sound as a bare .aac file, with wider app support

What is FLAC?

FLAC is a lossless audio format that compresses audio to about half the size of WAV without losing any quality.

  • MIME type: audio/flac
  • Released: 2001 by Xiph.Org Foundation
  • Lossless: shrinks WAV by 40–60% without losing a sample
  • The audiophile archiving standard

Frequently asked questions

Is this M4A to FLAC converter free?
Yes, it's completely free with no sign-up, no watermark and no daily limits.
Are my M4A files uploaded to a server?
No. The conversion happens entirely inside your browser, so your files never leave your device.
Is there a file size limit?
Filenary sets no limit — even files over 1 GB work. The only practical limit is your device's memory.
Will converting M4A to FLAC reduce the quality?
FLAC is a lossless format, so no extra detail is thrown away during the conversion — the result looks exactly like the source.
Can I convert several M4A files at once?
This converter handles one file at a time. When it's done, click Start over to convert the next M4A file.
Does it work on iPhone, Android, Mac and Windows?
Yes. It runs in any modern browser — Chrome, Safari, Edge or Firefox — on phones, tablets and computers, with nothing to install.

More M4A conversions

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