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Free local audio converter — no uploads

FLAC to M4A Converter — Free, Local, No Upload

The short answer: FLAC is perfect for archiving but awkward on devices and apps that never added FLAC support — and plenty of Apple-centric workflows are exactly that. Converting FLAC to M4A re-encodes the lossless audio as AAC, keeping every audible detail you choose to keep while dropping the file to a fraction of its archive size. The FLAC stays home as the master; the M4A travels.

How to convert FLAC to M4A

Convert FLAC to M4A now

The button opens the Audio Converter with FLAC → M4A 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 M4A output already selected.

  2. Drop your FLAC 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
FLAC
Output format
M4A
Max file size
200.0 MiB
Max output
200.0 MiB
Quality
Lossy — 96–192 kbps in three tiers
Processing
Local in your browser — nothing is uploaded

FLAC

FLAC → M4A

What to watch

AAC is lossy: the converter decodes the FLAC fully and re-encodes with the native AAC encoder at 96/128/192 kbps, so detail below the chosen tier is discarded — keep the FLAC as your archive. AAC's efficiency means Balanced 128 is transparent for most material. Sample rate and channel count pass through untouched. Inputs are capped at 200 MiB and outputs at 200 MiB, with a 5-minute per-run watchdog; the ~31 MB engine downloads on first use, then stays cached on your device.

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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 FLAC to M4A reduce audio quality?
Yes — AAC is lossy, so the conversion keeps what the chosen bitrate allows and discards the rest. The starting point is the best possible one, though: FLAC decodes to the exact original samples, so the M4A is a first-generation encode from a pristine source rather than a re-compression. Keep the FLAC archived and treat the M4A as the portable copy.
Which bitrate should I choose for the M4A?
Three tiers are offered: Compact 96, Balanced 128, and Quality 192 kbps. High-resolution sources benefit from Quality 192, where AAC is at its cleanest; Balanced 128 is the everyday choice for casual listening on phones and cars, and Compact 96 suits long spoken-word recordings.
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.