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M4A to FLAC Converter — Free, Local, No Upload

The short answer: Converting M4A to FLAC stores the decoded AAC audio in lossless compression — an archive-grade container for audio whose original master is gone. The FLAC holds exactly the decoded samples, tags and checksums properly, and will never degrade further; some collectors also use it to unify a library of mixed sources into one lossless format.

How to convert M4A to FLAC

Convert M4A to FLAC now

The button opens the Audio Converter with M4A → FLAC preselected — it runs entirely in your browser and nothing is uploaded.

Open Audio Converter

Local in your browser — nothing is uploaded

  1. Open the converter

    The button above opens the Audio Converter with the FLAC output already selected.

  2. Drop your M4A file

    Add the file (up to 200.0 MiB); the format is verified from its signature, not its name.

  3. Convert and download

    Press Convert; the ffmpeg audio engine (~31 MB) downloads on first use, then your file transcodes in a dedicated worker. Cancel stops the run cleanly.

Conversion facts

Input format
M4A
Output format
FLAC
Max file size
200.0 MiB
Max output
200.0 MiB
Quality
Lossless — bitrate tiers ignored
Processing
Local in your browser — nothing is uploaded

M4A

M4A → FLAC

What to watch

The container is lossless but the audio is still the decoded AAC: conversion cannot restore detail the AAC encode discarded, so the FLAC is an honest archive of the current quality, not an upgrade — and it is several times larger than the M4A. Sample rate and channel count pass through as decoded. Inputs are capped at 200 MiB and outputs at 200 MiB, with a 5-minute per-run watchdog; the ~31 MB conversion engine downloads on first use, then stays cached on your device.

Keep converting

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  • The tool behind this page

    Audio Converter

    Convert MP3, WAV, M4A, OGG and FLAC audio between formats entirely in the browser with ffmpeg.wasm — no uploads. Inputs up to 200 MB with 96/128/192 kbps bitrate tiers for lossy output; OGG uses Opus and WAV/FLAC stay lossless.

Frequently asked questions

Will converting M4A to FLAC improve the audio quality?
No — FLAC stores exactly what the AAC decodes to, bit for bit. What you gain is a stable, verifiable archive: proper metadata tags, integrity checksums, and a format that will never lose another generation, no matter how many times it is decoded or converted afterward.
Which bitrate should I choose for the FLAC?
None — FLAC is lossless, so the bitrate tier selector stays visible but the encoder ignores it, and the workspace says so. The output size follows the decoded audio itself; an M4A-to-FLAC file is typically several times larger than its source.
Are my audio files uploaded anywhere?
No. Decoding and encoding run in a WebAssembly build of ffmpeg inside your browser tab — the file never leaves your device, nothing is uploaded or stored on a server, and closing the tab discards everything.