Convert M4A to FLAC Online
Need to convert M4A to FLAC right now? Drop your file and get results in seconds. Everything runs in your browser. Your audio never leaves your device.
Drop your M4A file here or click to browse
M4A (.m4a) · Max 20 MB
"Online converter" normally means uploading your file to someone's server, waiting in a queue, and downloading the result. This page inverts that: it loads FFmpeg compiled to WebAssembly into your browser and does the work on your own machine. You keep the convenience of online — nothing to install, works on any OS — without the upload.
Yes, it gets larger — around 4× — since you're unpacking the audio rather than compressing it. Keep the M4A for storage and use the FLAC as the working copy. That matters here, because transfer is where server-based converters spend most of their time. With no upload and no download of the result, what's left is just the conversion itself: usually a second or two.
M4A files typically come from iPhone Voice Memos, iTunes libraries, GarageBand exports, and Apple Music downloads — and M4A is Apple's default, and while it plays widely, many DAWs and editors refuse it or import it with wrong durations. This freezes the existing loss rather than undoing it. Decode once to FLAC and every edit and export afterwards works on raw samples, adding nothing.
Because it's a web page rather than software, the same converter runs on Windows, macOS, Linux, ChromeOS, iPhone, and Android — with nothing to keep updated and none of the bundled adware that comes with downloadable free converters.
The M4A on your drive almost certainly started life in iPhone Voice Memos, and M4A is Apple's default, and while it plays widely, many DAWs and editors refuse it or import it with wrong durations. FLAC is the destination when you need uncompressed, edit-ready audio that every DAW and editor accepts. Yes, it gets larger — around 4× — since you're unpacking the audio rather than compressing it. Keep the M4A for storage and use the FLAC as the working copy. One honest note on this exact pair: M4A is already lossy, so moving to FLAC cannot restore detail the M4A encoder discarded — it hands you an uncompressed container, not better audio, and the value is a loss-free chain from here on.
Frequently Asked Questions
Is it safe to convert M4A to FLAC online?
With most online converters your file is uploaded to their servers, so safety depends on a retention policy you'll never read. Here the question doesn't arise: the conversion runs inside your browser and nothing is transmitted. Disconnect from the internet after the page loads and it still works.
How long does an online M4A to FLAC conversion take?
Seconds. Yes, it gets larger — around 4× — since you're unpacking the audio rather than compressing it. Keep the M4A for storage and use the FLAC as the working copy. With no upload and no download of the result, the only time spent is the conversion itself on your own CPU.
Do I need to install anything?
No — it's a web page. The FFmpeg engine ships to your browser as WebAssembly when the page loads. No software, no browser extension, no command line to learn.
Does it work on my phone?
Yes — Safari on iOS 15.4+ and Chrome on Android both run the conversion fully, so you can convert on whichever device happens to hold the file.
Will the FLAC sound different from my M4A?
This freezes the existing loss rather than undoing it. Decode once to FLAC and every edit and export afterwards works on raw samples, adding nothing.
About M4A
Apple's preferred audio format. Better quality than MP3 at same bitrate. Default for iTunes and Apple devices.
About FLAC
Lossless compression. Perfect quality at roughly half the size of WAV. The choice for audiophiles and archiving.